Replacing Wheel Bearings & Preventing Seatposts From Seizing | GCN Tech Clinic

Replacing Wheel Bearings & Preventing Seatposts From Seizing | GCN Tech Clinic


How do you replace your wheel bearings with the same type each time? What can you do to keep the seatpost on your road bike from slipping or seizing? Jon is back in the clinic to answer all of your cycling tech questions 🔧

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56 Comments on "Replacing Wheel Bearings & Preventing Seatposts From Seizing | GCN Tech Clinic"


  1. We love to help here at GCN Tech, so if you've got a question that you'd like us to answer leave it in the comments below using #AskGCNTech

    Reply

  2. Just when I found a bearing broken in half in my front wheel, glad I had a spare one…

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  3. I get about 250 miles on a single paraffin wax application. 500 miles seems pretty over-optimistic.

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  4. #askgGCNTech my bike is making some "metal" noises, I can't locate the source (one of the wheels hub? Pedals?). Have any tips on what I have to investigate in order to found the noise source?

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  5. Well if you'd just run Shimano Dura Ace, Ultegra or Deore XT / XTR then you'd never have to worry about this then would ya? Making this video pointless…

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  6. Ref: 105 shifting on the Zwift bike. You could buy Microshift shifters which are similar to Campy style but also run the same spacing as Shimano. 11sp and 10sp options available.

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  7. #AskGCNTech When should you replace brake/gear cables? Is there a rule of thumb for how many kilometers you should expect to get out of them? And when the are replaced, should you always replace both outer and inner cables or is it okay to just replace the inners in certain situations?

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  8. As I said many videos ago, just gimme that baby blue bike! #entitledhumanmode lelz

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  9. 52 to 55 chainring = 3/4 of a tooth on cassette. so to have a great line with the chain, every tooth you go up the cassette you need to add 4 teeth on the chainring. so to equal a 52×11 with a 55 you need 12 behind. not 15 john! to be on the 15 behind, you need 16 teeth more than 52 to have similar development. which is 68!! nobody runs 68 at the front john.

    with a 60 chainring, to equal a 52×11, you need 13 behind.

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  10. #AskGCNTech Hey Jon, I was wondering if you have any storage tips for a road bike in a college dorm? We can't put any holes in the walls and all my searches for adhesive wall hangers are coming up zero. Do you have any tips or options?

    Thanks for the help,
    -Joe

    Reply

  11. 8speed groupset on a modern direct drive turbo trainer: simply put a spacer on the freehub. A friend of mine had that problem, i told him what to do and it works just fine.

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  12. #AskGCNTech Hey Jon, great show! I have recently purchased an N=1 bike. I have been using it for road riding as well as some gravel. It has a 50/34 crankset and an 11-34 cassette. While one to one is pretty good for my road needs I could use some smaller gears when gravel riding. I'd like to run a 46/30 crank some but not all of the time. The chain length will be different for the two cranks. Is it better to a) break the chain and shorten/lengthen it every time I switch cranks, b) add a second quick link for an easy switch over, or c) use two chains of different lengths and swap them with the corresponding cranks? Sorry, long question. Cheers!

    Reply

  13. @ Hi Jon, I have a pair Shimano 9000 Dura Ace wheels that have around 3500 miles on them. Question – At what point should I be concerned about servicing the hubs. Would it based on milage and if so how many, or on performance or noise? Thanks.

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  14. Jon…..Campy 8 speed freehubs and cassettes have equal splines all around. 9 and 10 speed cassettes won't fit on the hub. 8,9,10,&`11 speed hubs are all 130mm over locknut.

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  15. Good answer on why to use a 55 ring on a TT bike……..The only thing I might add, is to ask if the rider can spin a 52×15 at 90 rpm? If he can't, it would be silly to change rings.

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  16. #AskGCNTech – Hi John! The Seatpost on my new bike is slipping down inside of the seat tube whilst I ride. The frame and seat post are both carbon so I have used carbon paste and tightened it to 8NM which is stated on the frame. Any suggestions? Thanks for all the great content!

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  17. Hi Jon, I have an old Cannondale RS300si (I absolutely love it) but been thinking about upgrading the bottom bracket/crankset. It's a Shimano BB-7700 octalink and it's been giving me problems with chewing through the crank arm 'interface' with the BB axle. Do you have any suggestions on how to upgrade to a hollowtech bottom bracket and 105 crankset? #AskGCNTech

    Reply

  18. based on the thumbnail for this video, I thought part of this video was going to be showing how to replace wheel bearings, not just talking about it.

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  19. When waxing the chain, what do you do with the cassette, the derailleur cogs and the front cogs? Do you just degrease them? Wax them too? Grease them?

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  20. Hey Jon, I've got a 2016 Giant TCR Advanced. It has an internal wedge clamp for the seat post. But despite using the correct torque settings it's stuck. I can't get the post out. It's at the correct height so not too much of a problem. But I'd like to take it on holiday and it won't fit in the bag with the post in place. Any help would be great. #AskGCNTech

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  21. Forget about any future bike giveaways. What about that rocket coffee machine. My dream coffee machine 😍

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  22. Waxed chains last a while before rewaxing is necessary. But the import thin is how clean it is before waxing. The other thing is if you use liquid lube it might seem like it is lasting longer but it will collect dirt and grime and turn into grinding paste. Wax falls off when it is done and you will know to rewax the chain.

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  23. #askgcn adjusting wahoo kickr from normal rim brake skewer for disc brake thru axle. please and thank you

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  24. #AskGCNTech Hi Jon. Love the show. I have an older SRAM red 10 speed. Low miles on it. Occasionally when I’m trying to shift my front derailleur from the large to small ring it just won’t move. After multiple tries it eventually moves down. And then the rest of the ride is fine. I keep the bike spotless and lube all pivot points. Any ideas? Thanks

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  25. i have been given dillinger hub motor kit with its powerd wheel bieng on the front. can i fit it on to my cube analog stock 2016 wheels, will cutting an re treading stronger spokes take the strain? will i beable to fit a new 9 speed set on to it?.. should i even start ti do this ?

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  26. Hi Jon, love the show. I have a Scott Speedster S30 with Shimano Tiagra 10 speed groupset which is about to become my winter and indoor training bike. It has new wheels so I have kept the rear and have put a turbo tyre on it. However I have put a 34 toothbrush cassette on the new wheel with a hanger extender to make the hills easier. Is it going to be problematic swapping between the different wheels with 28tooth and 34tooth cassettes? Saves me buying a new cassette for that too. #AskGCNTech

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  27. About the thumb shifters for 105: microSHIFT has thumb shifters and are unofficially compatible with Shimano. The model for the current 105 11-speed would be SB-R512C.

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  28. #AskGCNTech Helo John! I have a Shimano Ultegra Di2 r8070, and can't connected to my Wahoo Element Bolt or the E-tube App. The junction box jumps to adjustment mode (2 sec) directly without the 1 sec hold for the connection mode. Help!

    Reply

  29. Just a thought for the guy with the loose bb. I have a ceramic bbinfinite and the directions show having to shave a bit out of the frame to get it to fit. Might be an idea. I had a shop install mine so no idea if they did that on mine.

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  30. #AskGCNTech great vid as always! Thinking about wheel bearings i can't help wondering (since we now have hollowtech for cranks & the stuff we use in headsets) why we haven't got anything like that for wheel bearings – come on shimano etc… pull your fingers out?!

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  31. #AskGCNTECH
    Hi Jon,
    Your tech shows are great I watch every one !
    My question is. I have some very high end wheels with very light titanium skewers. The skewers have to be very tight ( over tight ?), to stop a clicking sound when climbing hard. I have lubed the skewer shaft and nuts , but they still need to be extremely tight to prevent this. It seems like they stretch ? Is this ok or should I just buy some high quality but heavier skewers ?
    Thanks, Dave in the USA

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  32. You should have mentioned that it is not recommended to use carbon paste on the steerer/stem interface.

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  33. Hi Jon. No matter how much degreaser and soap I use and no matter how much elbowsgrease and gizmos, I still can't get my chain perfectly clean. Is seems like the grime appears out of thin air. Is there a way to get a perfectly clean chain, without using fancy equipment, such as an ultrasonic cleaner?

    Cheers!

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  34. John you are a wealth of knowledge and entertaining to watch! Keep up the good work!

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  35. #askGCNTech

    Hey Jon. Wet gravel speed wobble or headset issue? I’m utterly perplexed. I’m an experienced categorized racer (mostly road and some single track mountain bike), but had yet to try this gravel phenomenon until yesterday! I raced a 52 mile HILLY gravel grinder on my 2016 Specialized CruX Elite X1. Had the bike about 9 months – I’d built it up myself (probably my 20th build or so). Bike has been ridden 300 miles prior to yesterday with no issues. Well, yesterday during the race, it started to rain. That was fine until maybe 10 minutes of good rain when the bike started to handle erratically. The road surface didn’t change much with the moisture, as it was a pretty hard packed gravel. I couldn’t hold the steering straight! I’d been flying at 20+ mph but was stuck going half that fighting what felt like speed wobble!? Climbing up (very steep) hills was easiest to control but flying back down was impossible…had to ride the brakes hard to control the twitching. I “gave up”, almost forfeited, but was so far from any support I just kept slowing chugging along. The headtube creaked (never done that before) after the rain stopped. As the creak went away, the bike got back to handling back to normal…COMPLETELY UNEXPECTED. What could have been the issue?

    The front wheel is tubeless. It felt like the wheel was floating on the hub or that the wheel was way out of balance, but no missing spokes and wheel seems balanced enough. The tires hadn’t picked up much or any mud that would caused it to be out of balance. Thought maybe water could have gotten in the wheel (not the tubes, as that’s obviously sealed) to cause imbalance. Headset seems to be tight..

    I’ve read on speed wobble and watched your GCN video on speed wobble. Bike has almost a slammed stem (so shouldn’t have any extra flex in the headset). Bike frame fits me but may be a bit larger fit than my other frames (still have 8” of seat tube exposed). And I’m a pretty light rider (5’10” @ 135 lbs). I’d bought the bike from a guy who had raced the bike…I’m left wondering if there isn’t some alignment issue within the headset or wheels? Any ideas are appreciated!

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  36. #AskGCNTech Hi, Are all breake leavers and disc calipers created equal, or are there some parts that just dont match. I'm building a bike with Mechanical Etap and Trp spyre slc disc break calipers. When i pull the leavers there is 1cm of pull before the breakes start to engage. I't seems like they breakes come all the way in, but there is just no stopping power in them and the pull feels really soft. I read some where that Sram requires a different leverage bar length on the caliper then shimano to work propperly…..What to do, just want to be able to stop before the road does, cheers 😀

    Reply

  37. Hi, I am fairly new to cycling and bought a gravel bike last year to do a chrity challange from London to German. I found that I struggle to gain speed on the road and am considering buying a new bike, what would you recommend, I quite like the cannondale systemsix #AskGCNTech

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  38. Just switched to road tubeless. Is it normal to have the tires go flat at home within a day or two of not riding? Seems like a downer if I decide to tour on this puppy.. am I doing something wrong? too much gravity where I live or something? Cheers..

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  39. BSP-97: That seat post clamp is exactly what I have been looking for! My wife and I use the same Zwift bike in winter by simply swapping the saddle/seatpost. We both have a bit of tape on each of our seatposts but with time, inserting/re-inserting and eventual slippage, it never stays put and eventually needs to be re-measured and re-applied. Now that's a simple and more permanent solution! Thanks!

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  40. I ride a Cannondale Synapse Carbon but I want to screw riding up grades and buy some upgrades. Will 50mm carbon wheels be worth the upgrade on an entry-level bike (with entry-level standard steel rims), or should I save my pennies more and get a proper aero-bike with equal-to-or-better wheels? (I don't live in a particularly hilly area so weight's not a problem)

    Reply

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