Shimano GRX Di2 - First Rides, Finer Details & More! - The First Dedicated Gravel Groupset
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- Опубликовано: 4 окт 2024
- "Following a multi-year global market study, product testing and development process, Shimano introduce the world’s first dedicated gravel component line: SHIMANO GRX. New for the 2020 model year, the SHIMANO GRX 800 series offers 1x11 and 2x11 drivetrains - with mechanical and Di2 electronic options - that allow riders to tailor their mixed surface riding experience and Explore Beyond." - Shimano
Shimano kindly invited me to their GRX Media camp in beautiful Whitefish, Montana, for several days of riding, tech talk and more.
In this video, you'll hear about some of the concepts behind GRX Di2, see my first rides, finer details, impressions and so forth. In particular, shifters, derailleurs and the sub brake levers are covered, along with everything else in the groupset.
This particular GRX groupset was installed on a Pivot Vault (see the link below for details of that frame and fork) with a full complement of Shimano Pro cockpit parts, etc, to be ridden and reviewed long term. Additionally, there will be a Montana ride experience video coming later.
Links of Interest:
Pivot Vault - wp.me/p4V4se-87k
How to Descend on Gravel Roads - wp.me/p4V4se-89k
Shimano Gravel Alliance - bike.shimano.c...
Amazon Affiliation Link:
No cost to you, but every purchase made helps keep Gravel Cyclist up and running! - www.amazon.com...
Web: GravelCyclist.com
Facebook: / gravelcyclist
Instagram - Instagram/GravelCyclist
Twitter - / gravelcyclist
Vimeo - vimeo.com/Grave...
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Great job JOM! Thanks for the post.
Thank you very much for this. All I needed to know and how I wanted to see it. Thanks!!
My pleasure!
Enjoy the content as usual. Your sub count should be way higher.
Thanks! Hopefully the subscriber count will continue to grow.
Looking forward to the dropper post remote being for-sale separately - using a PNW Coast dropper post for its suspension offerings - awesome for washboards.
Nice review
Great video! Thanks! :) Charlie - @BikeYourCity Brussels
From your initial ride, can you think of any reason why someone wouldn't want to use GRX on their road bike as well? The lower gearing (but not as low as MTB) would suit my fitness and hilly road riding preferences.
I say go for it. There are no rules about what you prefer to ride.
Besides possibly weight, nothing is holding you back from using grx on a road bike
GRX looks good but white fish Montana looks awesome
I will be posting my ride video soon. Stunning scenery!!!
Hi Jom , I would like to use a chainring 50/34 on a grx Di2. Is posible? I do have a Scott Addict Gravel 2022 with normal Grx shifting system and a 105 compact chainring (I Change that)….. and that suit me perfect for the kind of Gravel I do.
Good afternoon
Here in Brazil there is not much information related to the Shimano GRX 2x11 Groupset.
Have the following question, which model allows me to use cassette 11-40 or 11-42 with double crank?
Hi JOM,
I'm particularly interested in your experience of the hydraulic in-line brakes as I have cable versions on my cable disc bike and love them enough that I've held off hydraulic upgrades until an equivalent was invented.
How is the power of the in-line levers compared to the regular STI levers on the bike (I appreciate the reduced lever length impacts this as well)?
Did you notice any reduction in braking power in the regular STI levers compared to other Shimano hydraulic road brakes you have tried?
Are you aware of any difficulties with bleeding that might occur with the extra in-line levers?
Thanks!
Tony, buy these levers. I have no way of measuring power of the regular levers vs the cross tops, but they are plenty powerful enough with just one finger. Braking is on par with other Shimano hydro systems using the GRX Di2 levers. No idea about bleeding, I didn't setup the bike.
What's the deal with the wheelset? Did you get a chance to weigh them?
Yea..I'm struggling to find much info on the wheels
Funny, I asked Shimano Australia about the additional button for the Garmin and they told me there was none so I ended up buying the older R8070 levers. Also Shimano's supporting literature is not clear on this... so really typical Shimano
Sorry to hear that David, a serious bummer.
Does anyone have intel if 817 rear derailleur will actually work with 2×11 setup? I know it designed for 1×11, but wondering if it will. Currently have R8070 on my Lynskey GR PRO with Rotor 46/30 front and 11/42 rear, RX805 does work but wish cage was a little longer
My reading of the specs is that we would want to use 2x designed derailleur for the big cassettes because it has a much longer cage and capacity. The extender that is built into the 1x derailleur doesn't increase the capacity, just the max supported sprocket size. The question for those of us that want a 2x with 11-40/42 is whether the 2x derailleur needs an extender for this or not.
@@tonystanley978 That's not an extender. Shimano has been using the Shadow design since the 10spd 11-36 days (or maybe sooner?). They just dropped it tho, the new 12spd MTB RDs aren't shadow but they work with a 51T cog. The 1x specific derailleur works better with bigger cogs because of the offset upper pulley, on the 2x it's in line with the pivot point. (Shimano since moved to an offset pulley even on 2x MTB stuff)
I know the official capacity specs, but someone should measure the cage. I'm just eyeballing it, but to me it looks longer than a mid cage M8000, maybe about as long as a long cage M8000? That thing could eat an 11-40 and a triple. While a derailleur hanger extender will increase the max supported sprocket, a derailleur with an offset pulley will always work better on wider range cassettes. I know that people use road RDs with 11-42 cassettes, but the free chain length and the b-gap in the higher gears is ridiculous on those setups.
The same thing happened in the 10spd MTB days when cassette extenders started coming out. Basically gravel/adventure drivetrains are mimicking MTB drivetrains , but they're about 3 steps back. :)
@@HollyBoni Thanks for your feedback. I'm not too familiar with the MTB groupsets post 9-speed. I agree with your observation on the increased b-gap from just using an extender rather than a pivot offset but wouldn't the free chain length be a function of too short a cage length rather than a pivot offset?
@@tonystanley978 I think it has to do with the B-gap, but I could be wrong.
You crank up the b-screw on a road RD so it can clear a big cog, but then when you shift to a small cog, the b-gap is just huge. With a derailleur designed with an offset pulley that b-gap will be consistent both on the largest cog, and the smallest cog. If the b-gap is smaller on the smallest cog, that means the chain wraps around the cog more, so you have a bit less free chain. When a derailleur with an offset pulley reaches the smallest cog, it's almost like the upper pulley also starts to move a bit "forward", not just up. Hard to explain, but if you play around with an offset pulley RD you'll see.
Just my understanding and thoughts, all this could be wrong. :)
Interestingly I installed a cheapo new Sora 9spd RD for a friend, and to my surprise the upper pulley was a little offset. To me it looks like Shimano is holding these groups back for some reason.
@@HollyBoni Yes that's true. The chain wrap on the small sprocket would also be reduced without an offset increasing drive train wear. A potential trade off in the other direction is the increased clutch strength that could impact the FD shifting. I guess we're all hypothesising at the moment on which derailleur will be the best for 2x + 11-40/42 cassettes. I eagerly await for someone to try both and then tell us which way is better :)
How much does it cost ??
Depends where you're located and/or where you're buying it from. Just check your favourite big online shops.
A lovely system, but rather overpriced. Nothing warrants a 50% premium over equivalent road groupsets.
Which components are more expensive? To be honest I only really checked out the 10spd version in detail because that's what i'm most interested in, and didn't find it more expensive than Tiagra 4700. Maybe the RD but that should be compared to MTB stuff because of the clutch.
A quick glance at bike24 says that a 2x11 hydro Ultegra R8000 Di2 group costs exactly the same as a GRX Di2 RX815 group. Or are those two groupsets not on the same "level"?