When Llama releases a power meter review and it's over 20 minutes, you know it's gonna be a good trip down the rabbit hole on something that's mostly likely rubbish.
@@gplamaleft field question but having trouble connecting DA9100 power meter. Just got a new/old ex demo and has said power crank, guessing it been sitting around a few years so gave it a charge and so far all good. Lost Wahoo so using old Garmin 500, it says it is calibrated but will not display any power readings, been doing zero offset thing and all that. Have noticed their is no frame magnet as this bike was built as a demo and having power connected wasnt a priority. Will the 500 edge accept a bluetooth powermeter and do I need the magnet????
@@DavidStacey-tx7on Possibly needs a magnet. You'll have to excuse me from digging into this and providing a more detailed answer. If Shimano were a little more supportive of this channel, I'd put in the extra yards for queries like this. At present they won't even reply to my emails. (not your issue, I understand, but it does make things hard providing ad-hoc support for their products).
@@gplama appreciate responding so quick, maybe Shimano could take notice. Their etube app is a mess, really weird to navigate. They had best be careful with SRAM expected to release a new RED group it may damage them even more, after these power issues that seems fine in their eyes, just like their 10yr run of cranks🤷🤷🤷🤷🤷. If SRAM nail the front mech issues of old they might be in some strife
@@DavidStacey-tx7on magnet is mandatory for the power. ( power = cadence*force ) they use magnet for the cadence. so.. not an option running without. Perhaps in future, as pioneer did, they release a firmware and not need the magnet anymore.
Used to work for the British Standards Institute, testing electrical components (plus, switches, thermostats, etc). Sample size of 3 was perfect, left no room for the manufacturers to argue that out of a product run of thousands, we had somehow managed to find the only ones with flaws. Two failures out of the three was enough to condemn the whole batch.
Shimano needs a new head of engineering for their software/hardware. Between this, quality of their mobile apps, the recent ransomware attack, curious how a multi-billion dollar company manages to be this inept
Thank you for nerding out to this degree. I work at a shop and I often tell people as much as I can in person about various products and the experiences can get with them, but I almost always refer them to your videos if they'd like a more indepth and proper explanation. I've been watching you for years on here and I will keep watching as long as you keep creating. Thanks again. Also, please monitor audio levels. You don't normally have issues with this but on this video. At 3:34 the audio level drops so low that I had to bring my volume up to still be able to hear you, and then at 9:24 the little derailleur noise was loud enough actually blew out the windows in my living room, reset my neighbor's pacemaker and yet still wasn't as loud as a Campag EPS front derailleur. But please do double check these levels before posting! Thanks again!
What I took out of this is why the heck Shimano would not send you a power meter with the new firmware to test it before releasing it to the masses. The fact that you had to personally buy this meter blows my mind. From the whole of the cycling community - Thankyou.
The ACCC here in Australia would roast them if there was a case put to them about this meter. (The ACCC is our government consumer watchdog, and they are good!)
The ACCC is a lame pathetic bunch. How has Shimano gotten away with the bone breaking, life altering, busted crank arm debacle? For what 7 years? A clue might be ACCC's lame response to why they hadn't acted. It went something like this: It's up to the manufacturer (not us!) To upload notifications about any known faults (which were not interested in) and upload their recall notice. I swear to God this is their attitude. Then the product liability claimant is all on their own as they face up to foreign corporations and the PL laws that were designed by our low life leaders to expressly protect them. (Let's keep the donations flowing! Yummy, we just love those hedge funds) You are naive @gplama
Great Review Shane! I won’t be updating the firmware now. I don’t use them anyway, but just sometimes to counter check my Faveros. So surprisingly my dura ace was about 5w higher when I first bought them, recently since 6 months probably after an update they have been quite accurate for me but were reporting about 3-5w lower which is fine. I guess now they have totally messed up this with the latest firmware.
Fantastic test without the front derailleur on😃. I'm probably wrong, but it seems shimano has 2 straightforward things to do to get roughly on track from that. It looks like the deviation was approximately double when physically in the big ring, but in the small on the bottle cage derailleur. Almost as if someone subtracted where they should have added in the power calculations for the software. Along with setting the correct software ring to match the correct physical ring. I wouldn't be surprised if its a 5 min fix for them to get into the ball park. Keep geeking out, and that was a great test hack. I think you virtually solved shimano's issue lol.🙂
My solution to the issue was simple. At some point I just stopped waiting for Shimano to fix the problem (back when the first DA with power meter came out) and bought Rotor crankset with P2M power meter. I've been happily using the set since with no issues and accuracy as expected.
Same here. Using the Type S in combination with a Rotor 3D+ since 2015 without one single issue. Could not be happier...literally worth every penny and I would 100% buy P2M again. Not even talking about the fact that the whole set including cranks and chainrings was less than 1'000$!
Hi Shane, As always, quite fascinating data and analysis. As I recall from one of Keith Wakeham's videos, this power meter's inherent design limitations would suggest that acheiving accurate results most likely is not possible. I'm actually surprised that Shimano continues to attemp to patch this unit insted of quietly removong it from the marketplace.
Check out my reviews of the Stages solution for the R9200 & R8100 drive side cranks (linked in the video description). They've put the gauges on the outside of the crank arm which appears to work very well.
Really enjoying going down the rabbit hole of your PM reviews, Shane. Thought I was going for the Favero pedals, though like a moth to a flame I keep coming back to the Rally RK. Problem is, I have top-end Look Keo Carbon Blade Ceramic Ti on my main bike, and Look Keo Carbon Blade on the other, so it feels like a waste to have to bin one set or the other to install PM pedals on whichever bike I choose to ride. Based on your reviews, I'm now leaning towards the Inpeak crank-based PM, and I could probably fit both bikes for a comparable cost to one set of pedals. Shimano Ultegra 8100 on one bike, SRAM Force (10 sp) on the other.
It's Magene PES 505 PM for me with AB oval chainrings instead my Tiagra crankset (it's even lighter). Investing in powermetar and training instead blingy stuff. As I am on budget I thank Heaven for GP Lama.
I'd love to see some Shimano powermeter SPD SL pedals. I think if you get that working, you're also free to design cranks and stuff as you want. And, obviously, you could use them whereever you want. As an upgrade as well as on multiple bikes.
The last left/right power graph was not fully clear to me but looked to me almost that in summary total power was off by about -5%, and right side wrong by about -10% and that in fact the correction for big/small chainring did correct that problem in itself and maybe other improvements to make it more accurate which make the left side more or less ok now on both rings (?) but that just a general correction for the right side should be added. If that gets a plus of about 10%, then it should already look much better also bringing the total plus 5%. It maybe is coincedence that the correction for small/big done reversed is about the same as the increase correction necessary for the rightside to get the total power correct which is still missing (but in total divided over both sides so half of it this also has an effect of approx. 5 percent like the small/big correction). Although this all still sounds like correcting the error with an error which already then certainly is the case for the big/small chainring difference… Wait for firmware 4.2.1 or rather 4.3.0 since correction right side is a different one? ;-) or can they just adjust that in the calibration stage (software)?
Well at least it seems fairly consistent over your tests and different powers. If they just up it another 5-6% they would be quite near the supposed power reading. Maybe in the next update then. But maybe its a quality issue of the crank itself, as some other users report correct readings.
No idea how the world's biggest bike component manufacturer simply cannot get this right. If I was Shimano I'd be completely embarrassed by results like these.
Such a good review of the problems with the Shimano power meter. Love his persistence! On a slightly related note, does anyone know how to get a video screen capture of a Garmin 1040 like Shane has done at 6:52, for example? I've been wanting to capture a video of my Garmin 1040, but haven't figured it out. Certainly not as easy as it is with smartphone apps.
Excellent reporting! Shimano needs a whipping! I love my single sided stages, wild that my $250 power meter can be better than one that’s 10 years newer from the OEM.
Rode with a mate for the first time since update and was wondering why I am suffer so much with low power reading for the 4 hour ride. Mine PM9200 has gone from 3% over to 3-5% under since the recent update. I share the frustration Shane and wish I can get a refund for the damn thing. Thank you for your vids and testing to benefit the cycling community.
I am getting similar vibes to the crank arms crisis that Shimano is currently going through in conjunction with the Shimano Power Meters not reporting accurately. At least the problem with the crank arms has been sorted out (at least to our knowledge) and no longer being sold whereas they still continue to sell faulty power meters.
Hey Shane, thanks for the great work. I have a different sort of question. What is your take on Favero vs Garmin? I am on the market for the pedal-based PM and can’t decide on the two… Thank you in advance
As you stated it's strange they should account for the gear because the power is measured BEFORE the gear system is involved 🤷♂ Once you got the force applied to the sensor (basically at the crank in this case) and the vector direction you can calculate the torque and convert to power. Anyway, they messed up a lot
Presumably there's an issue with the accuracy of the actual force sensors that results in different measured force for the same actual pedal force depending on which ring you're in hence the need for the hack.
Can you measure power accurately when your crank has delaminated and snapped. Shimano need to do much better than they are at the moment. My 26 year old Shimano RX100 cable shifting plus a pair of Assioma Duos just work. Thanks for the interesting and informative content. Your videos are always worth watching.
Given the differences between big and small ring, there's obviously some asymmetric crank leg twisting forces also distorting that unnecessary integrated spider - which, remember uses GLUE as a structural part to transfer torque!?!?. I therefore come back to my comment from your earlier shimano power meter video. The integrated spider is ridiculous, especially since the Shimano comparable XT/XTR/SLX mountain bike groupset uses DIRECT-MOUNT chainrings and came out years before the 12 speed road stuff. Direct mount chainrings completely separate the right crank leg twisting force from chainring and is the reason that SRM, Rotor, Power2max and SRAM/Quarq don't have these problems. I'm more than happy with my p2m estimated L/R balance and no accuracy issues.
Mate, well done. I've said this for ages, these power meters are affected by chainline bending strains. Which is now why they're using a chainline lookup table and bodge fix from the rear mech position. Amazed they actually admit this. Time to start completely afresh. Didn't they acquire Pioneer? Were those numbers junk too?
Pioneer also had right side issues. It was one of the better meters in the 8000/9100 series, still not something I could use with confidence to compare other meters with.
Shimano has done some good things such as 105 Di2, but they seem to be lacking in many other areas. Still no 12 speed Di2 GRX gravel or XTR MTB. Still no direct mount like SRAM Transmission. Shimano used to dominate road, but SRAM now is taking a bigger share of victories.
My Vector pedals have something like 50,000 miles. Been submerged countless times. Had some teething issues with the battery holder, but Garmin solves that with free parts fast, which was YEARS ago.
If they are trying to compensate for 1 thing (lg/sm chainring), wouldn't they need to compensate for all variables? Q-factor/number of teeth on each chainring/chainline/chain length/cassette teeth, Crank arm length, etc.
What if you don’t have a shimano 81xx/91xx di2 drivetrain? Pretty excited that I’ll soon be shifting from an inaccurate 9100 powermeter that is getting replaced under the recall, to a less accurate 9200 model 🤭
Interesting - I will re-take my measures some day... I did a test myself a month ago comparing Assioma Duo, Direto XR and Shimano Dura-Ace R-9250P and I was in 1.5% tolerance for all tests I did (indoor and outdoor)... After applying firmware change what I can say is that the power balance measure improved
You also mean the right side power is correct for you? I also applied the firmware update but for me the right side still is clearly too low unfortunately.
Thanks for such a deep look into the inaccuracies of the Shimano powermeters!! Not sure if i'm alone here, but i really like them. The problem Shimano is trying to solve with this firmware update reminds me of a problem certain small spider powermeter company said they were experiencing: the 1x version was working fine, but when used as a 2x crankset they were seeing different offsets (big ring vs small ring) which led to innacuracies similar to what you are seeing with Shimano PMs. In my opinion, Shimano is trying to design those powermeters with a typical japanese mindset and that could take them a really long time to figure out by themselves. And they are in no rush because those cranks are selling and, more importantly, some bike brands keep buying them to put on their bikes Someone from their EU headquarters need to educate them on why it's OK to hire an outsider with a background on making accurate powermeters
I hear that the Japanese mindset thing is real. I'm told by an insider that US, AU and EU reps from Trek, Specialized and Giant were desperately screaming at Shimano Japan for almost 5 years at how wrong their 11-speed MTB groupset design was (basically an evolved 2x road bike flat bar design), but were completely ignored. Trek completely stopped selling shimano drivetrains on their Mid-high mtb's for almost 2 years, with Specialized and Giant mostly doing the same. THEN Shimano actually started listening... The 12 speed MTB stuff that followed was basically identical in concept to SRAM's 1x specific design.
Can someone explain the physics of the position of the derailer front or rear effecting power at the crank ?? Power is power is power ? What does it matter which gear you’re in ?
It seems a scaling factor might fix this issue, perhaps Garmin or Wahoo could add a scaling option for Shimano PM users. On SRMs something similar was possible by changing the slope on a Garmin or PC head units.
That's an inspired workaround, Shane. But holy hell, this might be the best reality show without the pre-scripted drama to make it interesting. I love tech, but I'd be lying if I said I understood even a small portion of the nuances that go into it. What I don't get is that this is their third go with this thing and it still sucks. How does it still suck? The only thing I can think is that the device or machine or whatever they use to confirm that these power meters are accurate....well, they built that, too? Just wow.
I'm intrigued by the "and another smart trainer I can't mention"...Are you testing a new upcoming product that we might be seeing soon? Or do you just have one that isn't supposed to be available in your location or something? 🤔
Would you do an update / recommendation on the Shimano recall when you have a power meter? I have an Ultegra 8000 and Duraace 9100, both with Stages dual sided power meters. As you know Stages is not answering phones and who knows what will happen with company assets. What should one do if they wanted a dual sided crank based power meter? Maybe wait for Stages technology to reappear in some other brand through a buyout, or try to get the Shimano power meter and hope they fix the firmware accuracy in the future?
Not sure on that one. Stages were the only company who solved the right side issue (that statement is also based on my data from the latest 4iiii dual sided too). An easier solution would be to use a standard crank and look at power pedals.
as a Shimano system user on all bkes I don't know which power meter to get for road bike. Assioma DUO Shimano spindles seems like the best bet (for dual-sided) until Shimano develops a proper spider-based power meter, as you allude (buying SRM e.g.). But given they'll be spending all their money on lawsuits for the foreseeable it might be a while.
My Assioma pedals are still going strong year after year. I can flip them from bike to bike in minutes. They were cheap to buy. I see no reason to not just use these, at least for how I use them.
Stages has been great for me other than the new seal I had to buy. Somehow it is so thin it gets baked in the heat and becomes oblong so it doesn't fit in the groove anymore. If they ever come out with a new version, I hope they fix this. Not the best for water intrusion either. I hate changing the battery tbh but at least its accurate. My Direto was doing some weird things though. I was in the Zwift jungle and not sure if its the game or the trainer but power kept slowly dropping sorta like a yoyo. I was getting some random command prompt screens flickering too which I assume is just the game loading more world data. Made me very nervous that it might crash during the race. I recommend everybody zwift racing get a battery backup
Thanks Shane, amazes me that they still can’t get this right. Feels like they’re 10 years behind everyone else. Plenty of companies within their grasp they could acquire to buy in the expertise and technology they need. Begs the question why they’re not doing their own testing before curling another turd into the market.
Are Shimano trying to workout the power that comes out of the wheel, hence the more complex method? I guess it could be useful to workout drivetrain losses, but would require a pedal power meter also.
Can Shimano just disable the drivetrain side of the power meter? As an 8100P owner I'd much rather have fairly accurate one-sided power than inaccurate dual-sided.
It's impressive how many times they've managed to get this wrong. I will say though that the shape of their power graphs does at least seem consistent with the other two meters, just with a bad offset/calibration. There's no ovious drift, lag, or other major errors. Seems like it wouldn't be hard to fix that and get an accurate meter.
It's odd though that if it were simply a matter of adding/subtracting a fixed offset that would be an easy fix and something you'd expect Shimano to fix in a minute. Perhaps the error is related to the rider weight as well - clearly there's an issue with the strain guages.
It's such a bodge and I really don't like Shimano decided to approach it like this, further more not to improve anything by doing so. Or maybe they did? When looking at the data with front mech off, it seems like scaling up just the right side by a few percent could get it to read "accurately" with how it is supposed to work with the data hacked based on front mech position. Or am I misseeing something? Anyway, thankful my new bike didn't come equipped with this and that my Assioma DUOs are already in the post.
Hi shane wondering if you can help. I have a 4iiii single sided power meter on my bike outdoors and a garmin vector 3 sigle sided on a static bike indoors. Im finding the garmin is reading lower for my exertion level. Im not sure which one is correct. Is there a way to test accuracy of the power meters? I dont have any others to test it against.
I'd put the Vector 3 on the 4iiii and do some comparative tests. The Vector 3 does have the ability to perform a static weight test, but that's a few steps ahead of any initial ride comparisons.
@@gplama ok thanks for the reply. Only way I can think is to put the pedals on my bike and use turbo trainer and watch the power on my head unit or zwift and the other on Garmin connect. I did have a problem in the past with the 4iiii in zwift where it doubled the power but it seems fine outside. Thanks again
I am stuck with this power meter which came on my new bike. It's difficult to sell and I have to admit, not really honest to do so. Since the left arm is accurate, do you know any IQ App or bike computer that would be able to display only the left power (3s average, lap average, etc but only of the left)? That would be a kind of workaround to at least have a more accurate training (I don't care if the overall power is wrong as long as I can rely on someting close to good, i.e. the left arm). thanks
Hi Shane, i have a 1Gen Dual Powermeter from Giant, I cannot update it or do anything with it, do you have any ideas? It's a thing with 3 Dot Charger on the TCR 2019 (Power Pro) Giant nor Shimano are willing to help :(
My power meter does not measure , only cadence when i check it on my etube. On the other side I cannot calibrate says there is a preasure and cannot calibrate. This happened when I picked up from maintenance, realized the blue light was on all the time.Anyone who has similar issue.?
I still think Shimano is missing the mark by not bringing a power pedal to market. I used to love Shimano pedals before switching to Garmin Vector 3. Shimano pedals are smooth and light and last forever (unlike their cranksets, of course).
When Llama releases a power meter review and it's over 20 minutes, you know it's gonna be a good trip down the rabbit hole on something that's mostly likely rubbish.
🤣🤣🤣
@@gplamaleft field question but having trouble connecting DA9100 power meter. Just got a new/old ex demo and has said power crank, guessing it been sitting around a few years so gave it a charge and so far all good. Lost Wahoo so using old Garmin 500, it says it is calibrated but will not display any power readings, been doing zero offset thing and all that. Have noticed their is no frame magnet as this bike was built as a demo and having power connected wasnt a priority. Will the 500 edge accept a bluetooth powermeter and do I need the magnet????
@@DavidStacey-tx7on Possibly needs a magnet. You'll have to excuse me from digging into this and providing a more detailed answer. If Shimano were a little more supportive of this channel, I'd put in the extra yards for queries like this. At present they won't even reply to my emails. (not your issue, I understand, but it does make things hard providing ad-hoc support for their products).
@@gplama appreciate responding so quick, maybe Shimano could take notice. Their etube app is a mess, really weird to navigate. They had best be careful with SRAM expected to release a new RED group it may damage them even more, after these power issues that seems fine in their eyes, just like their 10yr run of cranks🤷🤷🤷🤷🤷. If SRAM nail the front mech issues of old they might be in some strife
@@DavidStacey-tx7on magnet is mandatory for the power. ( power = cadence*force ) they use magnet for the cadence. so.. not an option running without. Perhaps in future, as pioneer did, they release a firmware and not need the magnet anymore.
Fool me once, shame on Shimano.
Fool me twice, shame on me.
Fool me three times, quality content!
The fools get fooled again - George Bush Jr
@@mjokffsgfjs such eloquence
Used to work for the British Standards Institute, testing electrical components (plus, switches, thermostats, etc). Sample size of 3 was perfect, left no room for the manufacturers to argue that out of a product run of thousands, we had somehow managed to find the only ones with flaws. Two failures out of the three was enough to condemn the whole batch.
Shane, thanks for the work you do in holding bike companies accountable.
Shimano needs a new head of engineering for their software/hardware. Between this, quality of their mobile apps, the recent ransomware attack, curious how a multi-billion dollar company manages to be this inept
They are all that way - the bigger a company gets the less they spend on basic shit.
They could easily buy Xcadey, sigey or some of these small companies which have good power meters?
Thank you for nerding out to this degree. I work at a shop and I often tell people as much as I can in person about various products and the experiences can get with them, but I almost always refer them to your videos if they'd like a more indepth and proper explanation. I've been watching you for years on here and I will keep watching as long as you keep creating. Thanks again.
Also, please monitor audio levels. You don't normally have issues with this but on this video. At 3:34 the audio level drops so low that I had to bring my volume up to still be able to hear you, and then at 9:24 the little derailleur noise was loud enough actually blew out the windows in my living room, reset my neighbor's pacemaker and yet still wasn't as loud as a Campag EPS front derailleur. But please do double check these levels before posting!
Thanks again!
Apologies for the audio. I noted the issues when it was processed on RUclips but didn’t have time to tonight to go back and fix them.
@@gplama no worries. Thanks for the reply!
What I took out of this is why the heck Shimano would not send you a power meter with the new firmware to test it before releasing it to the masses. The fact that you had to personally buy this meter blows my mind. From the whole of the cycling community - Thankyou.
Thank you Shane new subscriber here - great review backed up by good data. I look forward to catching up with old posts and to the future with new.
Well what could possible force Shimano fix what's broken for years probably? The threat of a Class Action lawsuit. It's false advertising...
The ACCC here in Australia would roast them if there was a case put to them about this meter. (The ACCC is our government consumer watchdog, and they are good!)
@@gplamaI thought they're a toothless tiger
The ACCC is a lame pathetic bunch. How has Shimano gotten away with the bone breaking, life altering, busted crank arm debacle? For what 7 years? A clue might be ACCC's lame response to why they hadn't acted. It went something like this: It's up to the manufacturer (not us!) To upload notifications about any known faults (which were not interested in) and upload their recall notice.
I swear to God this is their attitude.
Then the product liability claimant is all on their own as they face up to foreign corporations and the PL laws that were designed by our low life leaders to expressly protect them.
(Let's keep the donations flowing! Yummy, we just love those hedge funds)
You are naive @gplama
I am quite impressed by Shimano consistently getting it so wrong.
Great Review Shane! I won’t be updating the firmware now. I don’t use them anyway, but just sometimes to counter check my Faveros. So surprisingly my dura ace was about 5w higher when I first bought them, recently since 6 months probably after an update they have been quite accurate for me but were reporting about 3-5w lower which is fine. I guess now they have totally messed up this with the latest firmware.
Great analysis! Love the data dive. Glad i have the 4iii on my crankset.
Fantastic test without the front derailleur on😃. I'm probably wrong, but it seems shimano has 2 straightforward things to do to get roughly on track from that. It looks like the deviation was approximately double when physically in the big ring, but in the small on the bottle cage derailleur. Almost as if someone subtracted where they should have added in the power calculations for the software. Along with setting the correct software ring to match the correct physical ring. I wouldn't be surprised if its a 5 min fix for them to get into the ball park.
Keep geeking out, and that was a great test hack. I think you virtually solved shimano's issue lol.🙂
Really would love to see the unrated version of this! 😂 Must be the parent in you that gives you the patience for this exercise. Great stuff Shane.
My solution to the issue was simple. At some point I just stopped waiting for Shimano to fix the problem (back when the first DA with power meter came out) and bought Rotor crankset with P2M power meter. I've been happily using the set since with no issues and accuracy as expected.
Same here. Using the Type S in combination with a Rotor 3D+ since 2015 without one single issue. Could not be happier...literally worth every penny and I would 100% buy P2M again. Not even talking about the fact that the whole set including cranks and chainrings was less than 1'000$!
Same: P2m NgEco with Rotor 24mm axle and Aldhu/Vegast cranks. Works perfectly.
We went from mechanical goodness, with great powermeters to this faff. This is just crazy. Thx for taking one for the team Llama!
Hi Shane,
As always, quite fascinating data and analysis. As I recall from one of Keith Wakeham's videos, this power meter's inherent design limitations would suggest that acheiving accurate results most likely is not possible. I'm actually surprised that Shimano continues to attemp to patch this unit insted of quietly removong it from the marketplace.
Check out my reviews of the Stages solution for the R9200 & R8100 drive side cranks (linked in the video description). They've put the gauges on the outside of the crank arm which appears to work very well.
@@gplamais stages solution copyrighted or trademarked in such a way as to prevent shimano to implementing something similar?
Yeah, this smacks of getting the original design choice badly wrong. Rarely worthwhile persevering with that.
Really enjoying going down the rabbit hole of your PM reviews, Shane. Thought I was going for the Favero pedals, though like a moth to a flame I keep coming back to the Rally RK. Problem is, I have top-end Look Keo Carbon Blade Ceramic Ti on my main bike, and Look Keo Carbon Blade on the other, so it feels like a waste to have to bin one set or the other to install PM pedals on whichever bike I choose to ride.
Based on your reviews, I'm now leaning towards the Inpeak crank-based PM, and I could probably fit both bikes for a comparable cost to one set of pedals. Shimano Ultegra 8100 on one bike, SRAM Force (10 sp) on the other.
This is brilliant data analysis and investigation, Shane. Chapeau!
It's Magene PES 505 PM for me with AB oval chainrings instead my Tiagra crankset (it's even lighter). Investing in powermetar and training instead blingy stuff. As I am on budget I thank Heaven for GP Lama.
I'd love to see some Shimano powermeter SPD SL pedals. I think if you get that working, you're also free to design cranks and stuff as you want. And, obviously, you could use them whereever you want. As an upgrade as well as on multiple bikes.
The last left/right power graph was not fully clear to me but looked to me almost that in summary total power was off by about -5%, and right side wrong by about -10% and that in fact the correction for big/small chainring did correct that problem in itself and maybe other improvements to make it more accurate which make the left side more or less ok now on both rings (?) but that just a general correction for the right side should be added.
If that gets a plus of about 10%, then it should already look much better also bringing the total plus 5%.
It maybe is coincedence that the correction for small/big done reversed is about the same as the increase correction necessary for the rightside to get the total power correct which is still missing (but in total divided over both sides so half of it this also has an effect of approx. 5 percent like the small/big correction).
Although this all still sounds like correcting the error with an error which already then certainly is the case for the big/small chainring difference…
Wait for firmware 4.2.1 or rather 4.3.0 since correction right side is a different one? ;-) or can they just adjust that in the calibration stage (software)?
I obviously need to test my 9200P more, but the first impression last week was that it was looking better with the firmware update.
Why did you buy it in the first place 💀
@@rein2523 probably it came with the bike
Well at least it seems fairly consistent over your tests and different powers. If they just up it another 5-6% they would be quite near the supposed power reading. Maybe in the next update then. But maybe its a quality issue of the crank itself, as some other users report correct readings.
No idea how the world's biggest bike component manufacturer simply cannot get this right. If I was Shimano I'd be completely embarrassed by results like these.
Well, looks like I can be (still) very really happy with my Quarq DFour91 from 2018. Not outages at all, one battery swap a year.
Love these videos, you tell them, in this day an age you’d expect more from Shimano which I’ve been using for over 35 yrs with delight.:-).
Such a good review of the problems with the Shimano power meter. Love his persistence! On a slightly related note, does anyone know how to get a video screen capture of a Garmin 1040 like Shane has done at 6:52, for example? I've been wanting to capture a video of my Garmin 1040, but haven't figured it out. Certainly not as easy as it is with smartphone apps.
Excellent reporting! Shimano needs a whipping! I love my single sided stages, wild that my $250 power meter can be better than one that’s 10 years newer from the OEM.
Rode with a mate for the first time since update and was wondering why I am suffer so much with low power reading for the 4 hour ride. Mine PM9200 has gone from 3% over to 3-5% under since the recent update. I share the frustration Shane and wish I can get a refund for the damn thing. Thank you for your vids and testing to benefit the cycling community.
Brilliant review, again. Thanks Shane for flushing rubbish like this out….👍👍👍
I am getting similar vibes to the crank arms crisis that Shimano is currently going through in conjunction with the Shimano Power Meters not reporting accurately. At least the problem with the crank arms has been sorted out (at least to our knowledge) and no longer being sold whereas they still continue to sell faulty power meters.
Thank you sir. I was seriously considering this power meter because of the Shimano name.
Hey Shane, thanks for the great work. I have a different sort of question. What is your take on Favero vs Garmin? I am on the market for the pedal-based PM and can’t decide on the two… Thank you in advance
The most anticipated GPLlama video of the season.
Thanks for saving a lot of people a lot of time, frustration, and money. I'd like to see your advertisement post when you sold each of these 🤣
Very cool analysis Lama 👍
Stages is the only one to get for new Shimano cranks. My Dura Ace Left / Right crankset works great!!!
As you stated it's strange they should account for the gear because the power is measured BEFORE the gear system is involved 🤷♂
Once you got the force applied to the sensor (basically at the crank in this case) and the vector direction you can calculate the torque and convert to power.
Anyway, they messed up a lot
Presumably there's an issue with the accuracy of the actual force sensors that results in different measured force for the same actual pedal force depending on which ring you're in hence the need for the hack.
Phenomenal review Llama. Great sleuthing.
i am so sorry for what Shimano did to you. thank you for doing this, show the world.
Can you measure power accurately when your crank has delaminated and snapped. Shimano need to do much better than they are at the moment. My 26 year old Shimano RX100 cable shifting plus a pair of Assioma Duos just work.
Thanks for the interesting and informative content. Your videos are always worth watching.
I wish you tested before and after the firmware update to see if it even did anything.
Given the differences between big and small ring, there's obviously some asymmetric crank leg twisting forces also distorting that unnecessary integrated spider - which, remember uses GLUE as a structural part to transfer torque!?!?. I therefore come back to my comment from your earlier shimano power meter video. The integrated spider is ridiculous, especially since the Shimano comparable XT/XTR/SLX mountain bike groupset uses DIRECT-MOUNT chainrings and came out years before the 12 speed road stuff. Direct mount chainrings completely separate the right crank leg twisting force from chainring and is the reason that SRM, Rotor, Power2max and SRAM/Quarq don't have these problems. I'm more than happy with my p2m estimated L/R balance and no accuracy issues.
That's awesome. Well done man. Actually really nutting out bugs. Very cool
Thanks Sam! 👊🏼
I hope you can get your money back! Would love to see an SRM solution like you mention.
Mate, well done. I've said this for ages, these power meters are affected by chainline bending strains. Which is now why they're using a chainline lookup table and bodge fix from the rear mech position. Amazed they actually admit this. Time to start completely afresh. Didn't they acquire Pioneer? Were those numbers junk too?
Pioneer also had right side issues. It was one of the better meters in the 8000/9100 series, still not something I could use with confidence to compare other meters with.
This was some epic analysis, thank you
Shimano has done some good things such as 105 Di2, but they seem to be lacking in many other areas. Still no 12 speed Di2 GRX gravel or XTR MTB. Still no direct mount like SRAM Transmission. Shimano used to dominate road, but SRAM now is taking a bigger share of victories.
Awesome review, thanks for being honest about this :)
Love these deep dives
My Vector pedals have something like 50,000 miles. Been submerged countless times. Had some teething issues with the battery holder, but Garmin solves that with free parts fast, which was YEARS ago.
Thanks Shane!
If they are trying to compensate for 1 thing (lg/sm chainring), wouldn't they need to compensate for all variables? Q-factor/number of teeth on each chainring/chainline/chain length/cassette teeth, Crank arm length, etc.
What if you don’t have a shimano 81xx/91xx di2 drivetrain? Pretty excited that I’ll soon be shifting from an inaccurate 9100 powermeter that is getting replaced under the recall, to a less accurate 9200 model 🤭
I notice during the rod test at about the 7:15 mark the bike path just ends quite abruptly. I guess it’s not just the US where this happens… 😕
Yeah… there’s a few poorly designed roads around here.
Usually we have to wait until Sundays to get a roast, but this week it was served early and seasoned with a generous quantity of both salt and pepper.
fantastic test!
Interesting - I will re-take my measures some day... I did a test myself a month ago comparing Assioma Duo, Direto XR and Shimano Dura-Ace R-9250P and I was in 1.5% tolerance for all tests I did (indoor and outdoor)... After applying firmware change what I can say is that the power balance measure improved
You also mean the right side power is correct for you? I also applied the firmware update but for me the right side still is clearly too low unfortunately.
@@akampgerard I looked into overall measure from both sides and that one was in tolerance all the time...
@@volodaXX you mean from both sides seperately right? So left/right balance also ok?
So do you mean you were within 1.5% for both chainrings? Would be great to see more data on this
Thanks for such a deep look into the inaccuracies of the Shimano powermeters!! Not sure if i'm alone here, but i really like them.
The problem Shimano is trying to solve with this firmware update reminds me of a problem certain small spider powermeter company said they were experiencing: the 1x version was working fine, but when used as a 2x crankset they were seeing different offsets (big ring vs small ring) which led to innacuracies similar to what you are seeing with Shimano PMs.
In my opinion, Shimano is trying to design those powermeters with a typical japanese mindset and that could take them a really long time to figure out by themselves. And they are in no rush because those cranks are selling and, more importantly, some bike brands keep buying them to put on their bikes
Someone from their EU headquarters need to educate them on why it's OK to hire an outsider with a background on making accurate powermeters
I hear that the Japanese mindset thing is real. I'm told by an insider that US, AU and EU reps from Trek, Specialized and Giant were desperately screaming at Shimano Japan for almost 5 years at how wrong their 11-speed MTB groupset design was (basically an evolved 2x road bike flat bar design), but were completely ignored. Trek completely stopped selling shimano drivetrains on their Mid-high mtb's for almost 2 years, with Specialized and Giant mostly doing the same. THEN Shimano actually started listening... The 12 speed MTB stuff that followed was basically identical in concept to SRAM's 1x specific design.
Can someone explain the physics of the position of the derailer front or rear effecting power at the crank ?? Power is power is power ? What does it matter which gear you’re in ?
Thank you watched to whole vid.
How much money 🤑 have you saved so many people.
Thanks again 👍
New indoor trainer that you can't talk about, now you've got my attention 🧐
Great work, Shane 👏
When someone wins a Zwift race with this power meter, they really deserve a big kudos
Nothing compares to the zero percent accuracy of my IQ2 pedals.
I just saw a pair of thise on eBay last week. I didn't know they were even a "thing".
No contest with No Limits, total garbage even when given away
It seems a scaling factor might fix this issue, perhaps Garmin or Wahoo could add a scaling option for Shimano PM users. On SRMs something similar was possible by changing the slope on a Garmin or PC head units.
Maybe. Thats be stacking fixes/hacks to make it work though. Such a horrible situation.
That's an inspired workaround, Shane. But holy hell, this might be the best reality show without the pre-scripted drama to make it interesting. I love tech, but I'd be lying if I said I understood even a small portion of the nuances that go into it.
What I don't get is that this is their third go with this thing and it still sucks. How does it still suck?
The only thing I can think is that the device or machine or whatever they use to confirm that these power meters are accurate....well, they built that, too?
Just wow.
I just rode with my friend today with his brand new SL8 with the Ultegra Di2 group. On the left crank arm is a 4iiii PM 🤣🤣
I'm intrigued by the "and another smart trainer I can't mention"...Are you testing a new upcoming product that we might be seeing soon? Or do you just have one that isn't supposed to be available in your location or something? 🤔
Shane, what is ur top 3 crank-based power meter recommendation
Would you do an update / recommendation on the Shimano recall when you have a power meter? I have an Ultegra 8000 and Duraace 9100, both with Stages dual sided power meters. As you know Stages is not answering phones and who knows what will happen with company assets. What should one do if they wanted a dual sided crank based power meter? Maybe wait for Stages technology to reappear in some other brand through a buyout, or try to get the Shimano power meter and hope they fix the firmware accuracy in the future?
Not sure on that one. Stages were the only company who solved the right side issue (that statement is also based on my data from the latest 4iiii dual sided too). An easier solution would be to use a standard crank and look at power pedals.
Perhaps the Shimano power meters only work correctly on a Shimano crankset that is in the process of delaminating and about to break?
How do you get the Data out of the file to compare it? Thanks for help.
as a Shimano system user on all bkes I don't know which power meter to get for road bike. Assioma DUO Shimano spindles seems like the best bet (for dual-sided) until Shimano develops a proper spider-based power meter, as you allude (buying SRM e.g.). But given they'll be spending all their money on lawsuits for the foreseeable it might be a while.
Nice investigative journalism ;)
Shane is still the man!!!! If his review is not favorable then there are real problems.
My Assioma pedals are still going strong year after year. I can flip them from bike to bike in minutes. They were cheap to buy. I see no reason to not just use these, at least for how I use them.
The Assioma Duo in this video are my original pair from six years ago. 👌🏼
Stages has been great for me other than the new seal I had to buy. Somehow it is so thin it gets baked in the heat and becomes oblong so it doesn't fit in the groove anymore. If they ever come out with a new version, I hope they fix this. Not the best for water intrusion either. I hate changing the battery tbh but at least its accurate. My Direto was doing some weird things though. I was in the Zwift jungle and not sure if its the game or the trainer but power kept slowly dropping sorta like a yoyo. I was getting some random command prompt screens flickering too which I assume is just the game loading more world data. Made me very nervous that it might crash during the race. I recommend everybody zwift racing get a battery backup
I have two Stages meters and I am not happy with either of them. The results are constantly 10-15 watts high on average.
@@whynotride327 at least its consistent. I know that too so I just account for it on my power2max
I don't speak for others but I don't find a 5 wats range (always off 10 to 15 watts) to be very "consistent.
@@whynotride327 do you train your zones within 5 watts? That's the real question. Or do you ride without rewaxing your chain...
What do you think about using the qarq dfour91 power meter for the 9200 chainring?
If it all lines up chainline wise, all good.
Thanks Shane, amazes me that they still can’t get this right. Feels like they’re 10 years behind everyone else. Plenty of companies within their grasp they could acquire to buy in the expertise and technology they need. Begs the question why they’re not doing their own testing before curling another turd into the market.
Are Shimano trying to workout the power that comes out of the wheel, hence the more complex method? I guess it could be useful to workout drivetrain losses, but would require a pedal power meter also.
Thanks, Shimano
And it’s not cheap…great work Llama
Can Shimano just disable the drivetrain side of the power meter? As an 8100P owner I'd much rather have fairly accurate one-sided power than inaccurate dual-sided.
It's impressive how many times they've managed to get this wrong. I will say though that the shape of their power graphs does at least seem consistent with the other two meters, just with a bad offset/calibration. There's no ovious drift, lag, or other major errors. Seems like it wouldn't be hard to fix that and get an accurate meter.
It's odd though that if it were simply a matter of adding/subtracting a fixed offset that would be an easy fix and something you'd expect Shimano to fix in a minute. Perhaps the error is related to the rider weight as well - clearly there's an issue with the strain guages.
Shane what are your thoughts on the new Rotor 2INpower SL? or is that coming in the testing pipeline?
They tell me they’re sending one over. That was four months ago. I’ll test it if they do eventually send one.
It's such a bodge and I really don't like Shimano decided to approach it like this, further more not to improve anything by doing so. Or maybe they did? When looking at the data with front mech off, it seems like scaling up just the right side by a few percent could get it to read "accurately" with how it is supposed to work with the data hacked based on front mech position. Or am I misseeing something? Anyway, thankful my new bike didn't come equipped with this and that my Assioma DUOs are already in the post.
Shane, I hope you can get your money back for the crankset. Stages should buy Shimano or vice versa.😄
Hi shane wondering if you can help. I have a 4iiii single sided power meter on my bike outdoors and a garmin vector 3 sigle sided on a static bike indoors. Im finding the garmin is reading lower for my exertion level. Im not sure which one is correct. Is there a way to test accuracy of the power meters? I dont have any others to test it against.
I'd put the Vector 3 on the 4iiii and do some comparative tests. The Vector 3 does have the ability to perform a static weight test, but that's a few steps ahead of any initial ride comparisons.
@@gplama ok thanks for the reply. Only way I can think is to put the pedals on my bike and use turbo trainer and watch the power on my head unit or zwift and the other on Garmin connect. I did have a problem in the past with the 4iiii in zwift where it doubled the power but it seems fine outside. Thanks again
I am stuck with this power meter which came on my new bike. It's difficult to sell and I have to admit, not really honest to do so. Since the left arm is accurate, do you know any IQ App or bike computer that would be able to display only the left power (3s average, lap average, etc but only of the left)? That would be a kind of workaround to at least have a more accurate training (I don't care if the overall power is wrong as long as I can rely on someting close to good, i.e. the left arm). thanks
Nothing I’m aware of will do this.
Hi Shane, i have a 1Gen Dual Powermeter from Giant, I cannot update it or do anything with it, do you have any ideas? It's a thing with 3 Dot Charger on the TCR 2019 (Power Pro) Giant nor Shimano are willing to help :(
Not a lot I can suggest sorry. It’s 100% on these companies to support their products.
My power meter does not measure , only cadence when i check it on my etube. On the other side I cannot calibrate says there is a preasure and cannot calibrate.
This happened when I picked up from maintenance, realized the blue light was on all the time.Anyone who has similar issue.?
Best contact Shimano support. And hope you have better luck than I do with them.
Bought a quarq about 15years ago and I’ve never looked back.
Their acquisition by SRAM has been “problem solved” for anyone on any of their groups.
Shimano putting out e-waste. Thanks for the thorough investigations each time!
How do they get it so wrong?
Detective badge unlocked!
I still think Shimano is missing the mark by not bringing a power pedal to market. I used to love Shimano pedals before switching to Garmin Vector 3. Shimano pedals are smooth and light and last forever (unlike their cranksets, of course).
So, the Magene or SIGEYI power meters are really better than Shimano's mid/top end offering?
Based in the data I have, yes.