Questions tagged [bearings]

A bearing is an interface between parts that turn and parts that do not. The hubs in the wheels contain bearings, as do the bottom bracket, the head tube, and the pedals.

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82 views

Is this an integrated crown race?

The title says it all. I would like to change the bearings for my headset,but i have no idea if this crown race is removable. It is a Bontrager fork, probably from 2007. Thank you, From Norway.
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80 views

Broken fork bearing crown race stays

this is my diy electric bike, but in the latest headset servicing (I had to change the seal of the top bearing), I noticed that I've a broken part on the top of the "bearing crown race stays"...
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BB386EVO-24mm Press Fit Bottom Bracket Cup Removal

Good day to all! Issue My road bike has a BB386EVO bottom bracket standard with a 24mm internal diameter (I.D.) bearing set. I'm utilising a 24mm spindle crankset so no issues there. What I am seeking ...
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Damaged full-suspension linkage surfaces - creaking noises

I just got a brand new, high-end aluminium full suspension bike and after the first ride the bottom frame linkage (the big one, near the cranks) started making loud noises (video link with sound). ...
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Where should I prefer and avoid cartridge bearings in a bicycle?

All bicycle bearings, hubs, bottom bracket and headsets used to be cup and cone bearings. However, recently there has been a trend to replace these with cartridge bearings in new parts. Is this a good ...
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156 views

Resealing bearings in chinese OSPW

I am currently rebuilding an old steel bike with some modern parts and am searching for a OSPW because it looks quite cool. However a "real" one from CeramicSpeed seems way to expensive for ...
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44 views

What race crown for a 3T Exloro fork?

More than half a year ago, I bought a 3T Exploro Team frameset. To my big surprise, when building the bike, the fork's race crown is missing. The brand of the head tube cups is Cane Creek. Asking ...
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46 views

First time repairing a rear wheel hub, I am hearing bearing on bearing rattle/clicks when spinning

For the sake of doing a restoration I just serviced a rear wheel: new bearings, new grease, new axle and new dust caps. I think I have put enough grease. When spinning the wheel before putting it on ...
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Why aren't sealed hub bearings common place? [duplicate]

Loose hub bearings may be cheaper to mass produce, but why wouldn't sealed hub bearings be one of the first upgrades to a bike? It seems that most of us choose loose bearings. I'm thinking of ...
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178 views

How/where can I find replacements for these 'wheel bearing caps'?

I have started the restoration of a bike picked up from the bins. The bike has taken some abuse. The rear wheel axle was broken, same for the two "bearings" caps or dust seals. I am not sure ...
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80 views

New DIY project: restoring this bike from the bins. How can I service this back wheel?

I picked a broken bike from the garbage around the block. The bike has some damage. It looks like a stolen bike (spray paint awfully over original color), so it must have had some tough love. I have ...
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90 views

Rear axle keeps developing play, is it fixable or time for a new wheel?

26-inch mountain bike wheel with Shimano loose ball hub and freewheel. The old axle kept developing play. I installed a complete new one and new bearings and problem persists. Cones are properly ...
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How to fix bearing cup for fixings loose wobbly wheel hub of old bicycle?

I have watched videos for Bicycle Freewheel Disassembly/Assembly, and disassembled my damaged bicycle. The back wheel of it started to Cranking, and by opening its part based of this video instruction:...
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Freehub with sealed/cartridge bearings

I decided to buy a new freehub and replace it myself, as the one I had broke down (started spinning to both sides). However, I didn't realize the new freehub has sealed/cartridge bearings as opposed ...
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439 views

Major pitting in bearing cups; what can I replace?

I bought a "mystery meat" Peugeot bicycle, it turned out to be 1991 Peugeot "Milano" (couldn't find it in catalogs): 7-speed rear cassette, Shimano 200GS groupset. I disassembled ...
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101 views

Max speed for wheel bearings

I don't know much about bikes. I've got myself an older Specialized Stumpjumper. I asked myself the other day while I was riding with +50km/h through the forest what the maximum speed is the wheel ...
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253 views

Rear wheel causing road bike to vibrate

I have a 2019 Giant Contend 3 road bike and I have been having an issue with this bike on and off for the past month. The issue is that when I start pedaling the bike it vibrates. The vibration seems ...
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1answer
84 views

Front Wheel axle (Quando) with 1/4 bearings

my first post after years of using the forum. I am a mobile mechanic and keep coming up against these Quando front hubs (sometimes unbranded) that have a standard 9mm QR axle spindle, but with larger ...
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720 views

Just replaced axle on rear wheel. It is loose at first but as soon as I ride it, it tightens and wheel no longer rotates. Help!

Yesterday, the axle on my rear wheel snapped. I spent today trying to replace it with a new axle of same length. Before doing so, I checked bearings, and they seemed ok. When I put the hardware on the ...
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1answer
65 views

Clicking front hub after overhaul

I repacked a front hub I haven't worked on before and can't get rid of the clicking. (It wasn't clicking before I repacked it, just sluggish and overdue for an overhaul.) Bike is a 2016 Kona Sutra; ...
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Why is my upper headset bearing now pressed into the cup?

This is on my mountain bike. After returning from a ride a month or two ago, I noticed my threadless headset had developed some play. Ever since then, I've had to retighten it occasionally, maybe ...
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46 views

Lost bearing on disc brake for Kona Jake The Snake 2016

I have this bike, and I appear to have lost the bearing on the front wheel, causing the disc brake to rub up against the fork when I'm riding. (I'm not a bike expert, so sorry if I'm using the wrong ...
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1answer
43 views

Where does the third bearing go in my Dyno moto 7 cruiser headset?

I have a "Dyno Moto7" cruiser made in 1997. I removed the forks to paint the frame and there were 3 bearings that came out when the forks were removed. No one can figure out how the third ...
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1answer
109 views

How to mount Ohlins TTX22M to a 2018 Yeti SB 5.5

How do you mount a Ohlins TTX22M (17.87 x 2.25" - 16mm eyelet) shock to a 2018 Yeti SB 5.5? I previously removed a Fox DPX2 which had vastly different mounting hardware (it turns out). The Ohlins ...
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Why do cones pit in hub bearings?

So called cones are the the inner races in angular contact bearings in hubs. The outer races, usually simply called races, are usually integral to the hub and cannot be replaced. Cones however are ...
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251 views

Hard to diagnose noise/squeaking

So I've been on a journey to fix a worrying squeaking noise that is impossible to replicate on a stand. When I am cycling, the rhythmic squeaking noise seems to come from the front on the bike, but I ...
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1answer
847 views

Carbon taperd road fork - use crown race or not?

I have a 2016 Trek Emonda ALR 5 with a carbon fork. I am assembling the bike after general maintenance, and have noticed that I am missing (or: think I'm missing = am not sure) a crown race for the ...
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1answer
346 views

Gap between internal cartridge headset and fork

so I've replaced the bottom headset on my 2016 Kona Jake the Snake as the old one was rough and rusted. The replacement is the same size in all dimensions however doesn't seem to fit in properly - ...
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2answers
176 views

How to get rid of hub play in XTR FH-M975?

I recently bought a 2012 Santa Cruz Superlight 29, and there is some play in the rear wheel. The hub is an FH-M975 (XTR). With the wheel off, you can tell there's some play, but I guess there is ...
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415 views

What range of rotational speed for bike wheel bearings?

This document from SKF expresses bearing speed in terms of 'n dm', see screenshot below. As rotational speed of the bearing is important for grease selection, what range of rotational speeds do ...
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1k views

How can I remove a stuck bottom bracket cup?

I am repairing the bottom bracket of a US$100 bike with hard 2,000 miles (3,200 km). At approximately 1,800 miles (2,900 km) the bottom bracket made a crunchy sound, and after that there was a lot ...
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323 views

Should there be grease in my steel frame's tubes?

I've taken apart a road bike from the 70s with a (french) ball bearing bottom bracket. Looking inside I found (what I thought to be) absurd amounts of grease in the tubes coming into the bottom ...
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93 views

How to access bearings on this headset?

Since a while my racing bike seems to have delopped a little crackling noise in my headset. I thought servicing the headset bearings might be a logical first step. Unfortunately, when I opend it up I ...
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155 views

Suitability of open sided bearings for frame pivots

On a 10 year old bike I am trying to replace miniature frame pivot bearings which measure 9mm x 17mm x 4mm, pictured below, and are sealed with 689z stamped on. They must measure the same dimensions ...
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Headset replacement for Fit Bikes BMX

My son has a Fit BMX bike, seems to be a normal 20" setup. However, the head tube appears to have an inside diameter of 1 3/8", and every BMX headset I'm seeing expects that diameter to be 1 1/4" ID. ...
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3k views

Bearings vs. bushings in rear derailleur jockey wheels - which should be more resistant to contamination?

This question came up in a forum I frequent. As background, many of us are familiar with ball bearings, as they are used in many places on bikes: the bottom bracket, the hubs, the headset, etc. Not ...
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93 views

Tool to use pulling off end cap from a LIGHTWEIGHT STANDARD, ALL CARBON WHEEL, to change out the 609 bearings from steel to ceramic

I am wanting to change out my 609 bearings, which are steel, and replace with CeramicSpeed or enduro ceramics. Can anyone tell me the safest tool to use when extracting the end caps off this all-...
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849 views

Wilier oversize bottom bracket bearing cups for Shimano crank

My bike frame is a Wilier Imperiale with Campagnolo crankset. I am changing the crank to a Shimano 6800. The bottom bracket does not fit to the Shimano one. It is old version WILIER OVERSIZE BOTTOM ...
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What size are Campagnolo Ultra Torque bottom bracket bearings?

I was unable to find the dimensions of Campagnolo bottom bracket bearings. My understanding is that bearings have standard sizes with names like "6200", "6201", etc. See this chart for a big list. ...
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270 views

How to reinstall a freehub with cartridge bearings?

My road bike's freehub has an issue - the outer part of the body has about 1mm of play against the axle, resulting in a wobbly cassette. The freehub still functions but it needs replacing. It's a ...
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What bearings go in DT Swiss R23 Spine Disc (FW,RW,Freehub)?

I am not longer able to pedal or back-pedal freely. Coasting still works, so I suspect my freehub bearing is the problem. But man... I've been searching for hours now and can't seem to find what ...
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269 views

Are sealed bearings equal to cartridge bearings in single speed hubs?

Single speed hubs are often speced with sealed bearings. In my brief market search I haven't seen any hubs with cartridge bearings in the specifications. Are sealed bearings used synonymous with ...
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Formula hub - fixed cone on the axle

Does anybody have the diagram for a generic Formula hub axle assembly? It has a fixed cone on one side of the axe with no spanner flats. I'm not sure which side of the hub this is supposed to go on ...
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2answers
376 views

Over-locknut dimension (hub distance) (cup depth) changed after 10.000km

Recently I wanted to replace my bearings and spotted something strange. My Over Locknut Dimension has reduced by 7mm. You can spot the difference when you compare it to the new hub: Can this happen ...
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309 views

Ball bearings only on one side, and smashed “ring”?

I have been given a bike for free, as the rear wheel was very wobbly. I'm been learning how to take things apart, and investigated the axle - it's not bent. The ball bearings, however, were a ...
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Reattaching fork to mountain bike - What is the correct assembly order?

I'm trying to reassemble my mountain bike fork making sure to put the bottom crown race and assorted pieces back together, but I can't quite figure it out: Here are all the parts I have: (click the ...
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67 views

Different looking bearing races

So I’m cleaning my bearings and the cups and I’ve just realised one of them looks like it’s been bent inward. Is it supposed to look like this or has something happened?
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Which grease should be used between plastic and bearings?

I have taken apart an older Shimano 105 brake calliper, there are tiny bearings that sit inside the piece of plastic as shown in the image. Is 'standard' teflon bike grease appropriate here, or should ...
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2k views

Where are the bearings in thru axle hubs?

So I’ve looked all over the internet to find an anatomy picture of a thru axle hub, because I don’t understand where the bearings go, and I can’t find anything helpful. Can anyone help me understand ...
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Got a new frameset, don't know why I need this split ring collar?

I can work out all the bits of the semi integrated headset, the star fangled nut for the steerer, but I can't see why I need this? It has similar diameter to the steerer tube, is it a spacer? I don't ...