Do you have an MTB-Tech-related question for us here at GMBN Tech? Use the hashtag #AskGMBNTech with your comment for a chance to be featured on the channel! 👇
The plastic part will wear faster than bearings will ever. No need to mess with jokey wheel bearing at all. And BTW, only XT and above have bearings, anything below is just a simple slip bushings.
That's a big overlook from Anna to confuse ceramic bearings with ceramic bushings. Still, the answer is grease: speeds and loads in jockeys do not exceed those in wheels, which you grease too and not lube, and you have to keep dust and water away anyway.
@@45graham45 grease is a compound containing oil, oil and grease are both lubes, teflon powder is lube too, if you want to get into technicalities. "Lube or grease" in the question meant "lube or grease" where both lube and grease are verbs, not nouns. With lubing normally implying application of oil while greasing is application of grease. It was not about what type of lubricant to apply, but if to apply it at all - another Anna's miss as she wandered off during answering. And I got carried away too. Must have said "Yeah, lube it, and do it rather with grease". Hope that helps
@@kalijasin technically all bearing are steel deep groove ball bearings by default when not specified otherwise. Hence if specified being ceramic, they remain being ball bearings.
@@feedbackzaloop “Bushing - commonly referred to as sleeve bearings, is a cylindrical element built to support loading on an operational shaft that glides back and forth between the moving surfaces.” Reference: Quote from BushingMfg
On tubes, you're always better off going either correct size or smaller. Smaller can be inflated to fit a bigger tire and will expand/stretch quite a bit without issue. But trying to fit a bigger tube in a smaller tire will cause issues. So if you want to buy one set of tubes for bikes with different size tires, get ones that will fit the smallest tires you have.
Bearing manufacturers have done extensive research into the friction and longevity, why not simply consult the website of the manufacturer of your bearing?
But... What if the manufacturer's requirements are different from yours? They might be looking for longevity with minimal to no maintenance, you might be willing to do very frequent maintenance to gain a watt or two.
I prefer the term Analog vs Acoustic for Mountain bikes, but really, not sure why we cant just call them EMTBs and MTBs. People dont call them AMTBs, They arent guitars lol...
I have never greased my jockey wheel bearings. My attitude is if they aren’t making noise don’t mess with them. And since they don’t endure a lot of stress like pivot points and wheels they don’t require maintenance.
I'm going to treat my jockey wheels on my SLX derailleur as i do my chain whenever i see/hear probs. I didn't put any lube on my jockey wheels at first and they started squeaking within a week. I added a bit of dry lube and that has fixed the prob so far.....no riding in wet conditions. As soon as i see mud/rain, i'll drop a bit of wet lube on them and always keep up the maintenance/cleaning. Through some past experiences of chain skip, noise, and gummy clog, this is the best i can conjure up in the constant battle.🤷 We'll see how it goes over the next month.
About replacing seals, my LBS always used to measure the inside diameter of the seals when the fork is apart. Above a certain measurement they would replace them. Obviously you don't want the inside diameter to be larger than the stanchions (they won't seal), so replace them before they wear out. Only I can't remember the number when they replaced them, might be something like 90% of the stanchion diameter.
On Marks questions about geometry changes, I went from a 2013 Scott Scale 930 to a 2021 Nukeproof Scout and it took at least a month to finally get comfortable on the Scout. Two things that were hard to get used to were how far the front wheel stuck out and the more upright position compared to an XC race bike
I think your confusing bushings and bearings, ball bearings/sealed bearings require grease (many choices) I think what your veiwer was asking is should he be lubing plain bushes which is where the debate arises, shimano ones I never grease personally as they don't come with any on 👍
@@rctankchannelone7558 if it says caps, it must be caps, right? But simultaneously they are side surfaces of bushings, so some amount will be pressed into the contact area anyway. In this way you make sure to grease everything, tightening screw as well, while if you put grease on the bushing first, you most likely smear it off during install.
@@feedbackzaloop I guess so, I can honestly say I have never seen any grease or signs of it in all the ones I've took apart, but I have never taken a new one apart so possibly 😂
Bushing is a sleeve bearing so bushings are technically bearings. No one calls them bearings though because most cyclists and mechanics associate bearings with ball bearings.
She had to damage control a viewer calling out a sponsor's bikes as feeling terrible. 😂 But yes my understanding is that new vs old geometry does require slightly different riding techniques or styles also and the new bikes probably also feel a less little playful and harder to control on level~ish terrain.
#askGMBNtech Will you tell us all about Shimano CUES? What are the series that will be deprecated by it? Are the holes of the cranks and chainrings be backward compatible? Will we finally have a one stop shop to change between chainrings? Thanks! I love following the show every week. Keep it up!
Thank you, Anna, for another well-done tech video. You have been a wonderful addition to GMBN. You are brilliant, amusing, interesting, caring, delightful, and beautiful. You are a very talented journalist and mountain biker. You are a dream come true.
BIGGER tube and smaller tire at minute mark 6:54; I think you are saying fit tube in tire 'off the rim' to see if it has excessive bulge, maybe ... maybe not then try the fit on the rim
Pack jocky wheels with grease after a good clean. Keeps dust and water out for ages. None of us here are good enough to notice gains of having a faster spinning jocky wheel.....
#AskGMBNTech I have 148 boost wheel hub that originally came with Shimano 10 speed. Can I just just unscrew the HG freehub and slap a Microspline to upgrade it to 12 speed?
Quality sealed bearings like for example SKF are Lubed for its entire lifetime Its definetely not recomended to regrease , you will probably cause more damage than do good Knowing This from working with bearings all my grown up life😮
It already exists, but it's a rare sight. It's been in automotive industry for decades. But not common in the bike industry. Kettle Cycles has carbon rotors. Quote from bike radar: "Note the absence of holes in the brake track The thickness, or lack thereof, of disc rotors is a significant hurdle. The materials used have to be quite stiff and, despite the fact the rotors are approximately 2-2.5mm thick, must do an adequate job of dissipating heat. “If you jumped out to 4mm thick you could successfully use some of the materials that have been attempted, but then you would be creeping up to the weight of aluminum and steel rotors,” noted Step " " There’s also the mater of wet weather performance. This has been an issue for those riding road bikes with carbon rims for many years. The same issue has been a stumbling block for the development of carbon rotors. Moisture on the surface and in the carbon itself can significantly degrade braking power. A brief but unnerving “warm up” period is often needed before the pads take hold. Surface treatments are one possible solution, though they have a tendency to wear and degrade over time. " After some research I also found Alpha Ceramic Rotor RS, from Spain. But I see their website is down, so maybe that's no longer exist. I also found Alien Machinery rotor, unlike the others it has venting holes, bu maybe that was just a display item. But their website is also down, looks like it was a Taiwanese company. I see some of their rotors had white ceramic inserts in the venting holes. But I see a rotor looking the same is Scappa Carbon Ceramic. But the white ceramic won't stay white after use. Alligator also has a version of the same design, but it's a carbon and kevlar rotor, but same shape and also uses the ceramic inserts. But I checked their website, no carbon rotors. So it seems to be abandoned. I don't know why. I see they also had a rotor with alu spider and carbon braking surface. It was on display at cycling shows in 2018.
#AskGMBNTech When measuring suspension sag my bike sinks quite a bit under its own weight. Should I be measuring sag with the bike on the ground or unweighted on the bike stand?
#AskGMBNTech What ever happened to rapid rise derailleurs? Full disclosure: I was big into mountain biking from '96 to about '03, and just got back into it in the last couple of years...so I may have missed a few things.
You and me both. I strayed away in 2009 after graduating high school and going to college. Just coming back this year and I've got a bit of catching up to do lol
@@kisilvan You still get relatively simple MTBs with coil spring forks and mechanical shifting. Electric shifting, full suspension and air forks are no standard in the lower price class
@@simonm1447 true but if you're into anything other than basic biking geo, hub standards, etc etc have changed even since the 2010s and if you build up your own bikes it's a huge learning curve when you've been out of it for a while.
#AskGmbnTech What happened to Doddy? Is he still alive? Did he get kidnapped by ballon aliens? Is he getting tanned? Did the bike economic crisis get to him?
#askgmbntech Hello doddy, anna and gmbn fellas. I'm thinking on putting a 160 travel fork on my SC chameleon which supposedly max at 140, i know a rule of thumb is no more than 10mm than stated, so some other 10mm will make that much of a negative effect? Considering on taking stem spacers out, swapping less rise handle bar and running 30% sag (hoping it remains at constant ~40mm travel), will any of that help? Also might there be any issue with that constant 30% sag? As if the stanchions/seals/lower legs might develop a problem? I would really like to get that fork since its a new top end fox 36 for a super deal and I'm also planning on getting a more AM/enduro frame in a not so distant future. Thanks! 🤙🏻🤙🏻
You could do it, but you have to consider if it's worth it for you, keep in mind that you're taking risks with the extra stress on the steer tube and for that bike it might not be worth it, if you're not using that much travel from your current fork you could soften it a bit if that's an option. Don't take my word for it, i am no expert. If you're planning on buyng another frame and you're worried the deal might not be available once you get it, you could also buy the fork and save it for the next bike if you planned on swapping it on the new one.
#AskGMBNTech when it comes to jockey wheels that have bearing cartridges, unlike the nasty basic shimano stuff, and other bits with press fit bearings like some bottom brackets or headset bearings do you recommend using loctite 641 or a similar product from another company? thanks tel
#AskGMBNTech Anna getting a lot of BackLash for putting Bushings and Bearings in the same category. Technically she’s Not wrong though. A Bushing is a Bearing. Its a sleeve bearing. “ Bushing - commonly referred to as sleeve bearings, is a cylindrical element built to support loading on an operational shaft that glides back and forth between the moving surfaces.” Reference: BushingMfg
All bushings are bearings, but not all bearings are bushings. She answered a question that was probably about plain bushings, as if it had been about ball bearings.
@@mattgies is getting backlash over putting bushings in the category of bearings when she is not wrong because bushings are in fact bearings. That’s the claim I was making.
Do you have an MTB-Tech-related question for us here at GMBN Tech? Use the hashtag #AskGMBNTech with your comment for a chance to be featured on the channel! 👇
The plastic part will wear faster than bearings will ever. No need to mess with jokey wheel bearing at all. And BTW, only XT and above have bearings, anything below is just a simple slip bushings.
That's a big overlook from Anna to confuse ceramic bearings with ceramic bushings.
Still, the answer is grease: speeds and loads in jockeys do not exceed those in wheels, which you grease too and not lube, and you have to keep dust and water away anyway.
But grease is lube.
Bushing is a sleeve bearing so technically she is right.
@@45graham45 grease is a compound containing oil, oil and grease are both lubes, teflon powder is lube too, if you want to get into technicalities. "Lube or grease" in the question meant "lube or grease" where both lube and grease are verbs, not nouns. With lubing normally implying application of oil while greasing is application of grease. It was not about what type of lubricant to apply, but if to apply it at all - another Anna's miss as she wandered off during answering. And I got carried away too. Must have said "Yeah, lube it, and do it rather with grease".
Hope that helps
@@kalijasin technically all bearing are steel deep groove ball bearings by default when not specified otherwise. Hence if specified being ceramic, they remain being ball bearings.
@@feedbackzaloop “Bushing - commonly referred to as sleeve bearings, is a cylindrical element built to support loading on an operational shaft that glides back and forth between the moving surfaces.”
Reference: Quote from BushingMfg
I think you missed to question. Lower priced derailleur jockey wheels have a bushing not a bearing. Should you grease or lube these bushings.
Thanks Mate! Looking for this kind of comment. He asks about bushings not bearings.
Bushings should not need lube and defo not grease. Some will have a permanent 'lube' bonded or embedded in the bushing.
On tubes, you're always better off going either correct size or smaller. Smaller can be inflated to fit a bigger tire and will expand/stretch quite a bit without issue. But trying to fit a bigger tube in a smaller tire will cause issues. So if you want to buy one set of tubes for bikes with different size tires, get ones that will fit the smallest tires you have.
Bearing manufacturers have done extensive research into the friction and longevity, why not simply consult the website of the manufacturer of your bearing?
But... What if the manufacturer's requirements are different from yours? They might be looking for longevity with minimal to no maintenance, you might be willing to do very frequent maintenance to gain a watt or two.
Well not all.
Tubes are very forgiving
I put a 26x2 into a 700x32 with a little stretching and worked no problem.
That was like 100mm difference not 7mm
Pedal kickback on a ebike is different. The motor can cycle forward without moving the cranks. It wouldn’t kickback like an analog
I prefer the term Analog vs Acoustic for Mountain bikes, but really, not sure why we cant just call them EMTBs and MTBs. People dont call them AMTBs, They arent guitars lol...
I have never greased my jockey wheel bearings. My attitude is if they aren’t making noise don’t mess with them. And since they don’t endure a lot of stress like pivot points and wheels they don’t require maintenance.
I'm going to treat my jockey wheels on my SLX derailleur as i do my chain whenever i see/hear probs. I didn't put any lube on my jockey wheels at first and they started squeaking within a week. I added a bit of dry lube and that has fixed the prob so far.....no riding in wet conditions. As soon as i see mud/rain, i'll drop a bit of wet lube on them and always keep up the maintenance/cleaning. Through some past experiences of chain skip, noise, and gummy clog, this is the best i can conjure up in the constant battle.🤷 We'll see how it goes over the next month.
About replacing seals, my LBS always used to measure the inside diameter of the seals when the fork is apart. Above a certain measurement they would replace them. Obviously you don't want the inside diameter to be larger than the stanchions (they won't seal), so replace them before they wear out. Only I can't remember the number when they replaced them, might be something like 90% of the stanchion diameter.
On Marks questions about geometry changes, I went from a 2013 Scott Scale 930 to a 2021 Nukeproof Scout and it took at least a month to finally get comfortable on the Scout.
Two things that were hard to get used to were how far the front wheel stuck out and the more upright position compared to an XC race bike
Just my personal experience with different sized innertubes. I use 26x2.0/2.25 tubes in a 26x1.5 tyre in my commuter. No problems in many years.
I think your confusing bushings and bearings, ball bearings/sealed bearings require grease (many choices) I think what your veiwer was asking is should he be lubing plain bushes which is where the debate arises, shimano ones I never grease personally as they don't come with any on 👍
Shimano dealer's manual asks for putting grease under pulley caps.
@@feedbackzaloop under the caps or on the bushing surfaces?
@@rctankchannelone7558 if it says caps, it must be caps, right? But simultaneously they are side surfaces of bushings, so some amount will be pressed into the contact area anyway.
In this way you make sure to grease everything, tightening screw as well, while if you put grease on the bushing first, you most likely smear it off during install.
@@feedbackzaloop I guess so, I can honestly say I have never seen any grease or signs of it in all the ones I've took apart, but I have never taken a new one apart so possibly 😂
Bushing is a sleeve bearing so bushings are technically bearings. No one calls them bearings though because most cyclists and mechanics associate bearings with ball bearings.
Love the vids!
Thanks! Glad you're enjoying them! 🙌
She had to damage control a viewer calling out a sponsor's bikes as feeling terrible. 😂 But yes my understanding is that new vs old geometry does require slightly different riding techniques or styles also and the new bikes probably also feel a less little playful and harder to control on level~ish terrain.
I use Bones Speed Cream. It’s for skateboard bearings. Works great for these too. They spin super fast. Way better then grease.
Aslo on boner. Than balls go way butter.
@@alexanderscott2567 I’ll have to give that a try lol
I was going to write the same. Skate oil, or an oil for sewing machines, those are perfect
#askGMBNtech Will you tell us all about Shimano CUES? What are the series that will be deprecated by it? Are the holes of the cranks and chainrings be backward compatible?
Will we finally have a one stop shop to change between chainrings?
Thanks! I love following the show every week. Keep it up!
Bushings are not same as ball bearings as possibly cross referenced... V different methods to achieve the same thing
Thank you, Anna, for another well-done tech video. You have been a wonderful addition to GMBN. You are brilliant, amusing, interesting, caring, delightful, and beautiful. You are a very talented journalist and mountain biker. You are a dream come true.
BIGGER tube and smaller tire at minute mark 6:54; I think you are saying fit tube in tire 'off the rim' to see if it has excessive bulge, maybe ... maybe not then try the fit on the rim
Pack jocky wheels with grease after a good clean. Keeps dust and water out for ages. None of us here are good enough to notice gains of having a faster spinning jocky wheel.....
Bearings and bushings are different things though
Bushings are sleeve bearings.
#AskGMBNTech are the freehub bodies on both Ratchet LN or Ratchet EXP interchangable? what if its boost or super boost hubs?
#AskGMBNTech I have 148 boost wheel hub that originally came with Shimano 10 speed. Can I just just unscrew the HG freehub and slap a Microspline to upgrade it to 12 speed?
Quality sealed bearings like for example SKF are Lubed for its entire lifetime
Its definetely not recomended to regrease , you will probably cause more damage than do good
Knowing This from working with bearings all my grown up life😮
#AskGMBNTech Nice job with the videos Girl & Guys. Question: Will we see Carbon disc brake rotors on MTB’s and in cycling in general?
It already exists, but it's a rare sight.
It's been in automotive industry for decades. But not common in the bike industry. Kettle Cycles has carbon rotors.
Quote from bike radar:
"Note the absence of holes in the brake track
The thickness, or lack thereof, of disc rotors is a significant hurdle. The materials used have to be quite stiff and, despite the fact the rotors are approximately 2-2.5mm thick, must do an adequate job of dissipating heat.
“If you jumped out to 4mm thick you could successfully use some of the materials that have been attempted, but then you would be creeping up to the weight of aluminum and steel rotors,” noted Step "
" There’s also the mater of wet weather performance. This has been an issue for those riding road bikes with carbon rims for many years. The same issue has been a stumbling block for the development of carbon rotors. Moisture on the surface and in the carbon itself can significantly degrade braking power. A brief but unnerving “warm up” period is often needed before the pads take hold. Surface treatments are one possible solution, though they have a tendency to wear and degrade over time. "
After some research I also found Alpha Ceramic Rotor RS, from Spain. But I see their website is down, so maybe that's no longer exist.
I also found Alien Machinery rotor, unlike the others it has venting holes, bu maybe that was just a display item. But their website is also down, looks like it was a Taiwanese company.
I see some of their rotors had white ceramic inserts in the venting holes.
But I see a rotor looking the same is Scappa Carbon Ceramic. But the white ceramic won't stay white after use.
Alligator also has a version of the same design, but it's a carbon and kevlar rotor, but same shape and also uses the ceramic inserts. But I checked their website, no carbon rotors. So it seems to be abandoned. I don't know why.
I see they also had a rotor with alu spider and carbon braking surface. It was on display at cycling shows in 2018.
Good video. Love your hair. 💕
Bushings need what lube cheers
Hi Anna. Was the "cross-country isn't dead YET" statement a prediction on your part?
Not at all, Anna is looking forward to the upcoming season more than ever!
#AskGMBNTech When measuring suspension sag my bike sinks quite a bit under its own weight. Should I be measuring sag with the bike on the ground or unweighted on the bike stand?
Sag is the difference between fully extended shock and static ride height under your ride ready weight.
I thought knees-over-pedals was already debunked?
That’s what I thought.
What about ceramic ones ? Can one use gear oil ?
Ceramic bearings are suppose to be run dry.
Will ceramic bearings make me go faster?
Hasn’t that already been debunked?
no
Just cleaned and regressed my jockey bearings... Bushings are not bearings, should not use lube. Designed not to.
Bones speed cream when it comes to bearings
#AskGMBNTech What ever happened to rapid rise derailleurs?
Full disclosure: I was big into mountain biking from '96 to about '03, and just got back into it in the last couple of years...so I may have missed a few things.
You and me both. I strayed away in 2009 after graduating high school and going to college. Just coming back this year and I've got a bit of catching up to do lol
Rapid rise derailleurs died out 20 years ago
Same here, it was much simpler back then from what I remember
@@kisilvan You still get relatively simple MTBs with coil spring forks and mechanical shifting. Electric shifting, full suspension and air forks are no standard in the lower price class
@@simonm1447 true but if you're into anything other than basic biking geo, hub standards, etc etc have changed even since the 2010s and if you build up your own bikes it's a huge learning curve when you've been out of it for a while.
When you grease a fitting you are lubricating it. Grease IS lube.
#AskGmbnTech What happened to Doddy?
Is he still alive?
Did he get kidnapped by ballon aliens?
Is he getting tanned?
Did the bike economic crisis get to him?
maybe these were recorded when he was off with covid?
Or he is doing a jess/henry/smithy🤔😋
#askgmbntech Hello doddy, anna and gmbn fellas. I'm thinking on putting a 160 travel fork on my SC chameleon which supposedly max at 140, i know a rule of thumb is no more than 10mm than stated, so some other 10mm will make that much of a negative effect? Considering on taking stem spacers out, swapping less rise handle bar and running 30% sag (hoping it remains at constant ~40mm travel), will any of that help? Also might there be any issue with that constant 30% sag? As if the stanchions/seals/lower legs might develop a problem? I would really like to get that fork since its a new top end fox 36 for a super deal and I'm also planning on getting a more AM/enduro frame in a not so distant future. Thanks! 🤙🏻🤙🏻
You could do it, but you have to consider if it's worth it for you, keep in mind that you're taking risks with the extra stress on the steer tube and for that bike it might not be worth it, if you're not using that much travel from your current fork you could soften it a bit if that's an option. Don't take my word for it, i am no expert. If you're planning on buyng another frame and you're worried the deal might not be available once you get it, you could also buy the fork and save it for the next bike if you planned on swapping it on the new one.
I do it sometimes
No, unless it's making noise then just ride the dam bike.
As with most fun and dangerous things in life, it's better to go in dry!
#AskGMBNTech when it comes to jockey wheels that have bearing cartridges, unlike the nasty basic shimano stuff, and other bits with press fit bearings like some bottom brackets or headset bearings do you recommend using loctite 641 or a similar product from another company? thanks tel
#AskGMBNTech
Anna getting a lot of BackLash for putting Bushings and Bearings in the same category. Technically she’s Not wrong though. A Bushing is a Bearing. Its a sleeve bearing.
“ Bushing - commonly referred to as sleeve bearings, is a cylindrical element built to support loading on an operational shaft that glides back and forth between the moving surfaces.”
Reference: BushingMfg
All bushings are bearings, but not all bearings are bushings. She answered a question that was probably about plain bushings, as if it had been about ball bearings.
@@kalijasin That phrase does not remotely mean what you seem to think it means.
@@mattgies that’s a strawman fallacy!!
@@mattgies is getting backlash over putting bushings in the category of bearings when she is not wrong because bushings are in fact bearings. That’s the claim I was making.
I use banana skins.
😇😇😇
I have sent the message ❣️