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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77 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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61 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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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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97 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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173 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
53 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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670 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
57 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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63 views

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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43 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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36 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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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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124 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
414 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
231 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
153 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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372 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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3answers
955 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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313 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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89 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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148 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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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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89 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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657 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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741 views

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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182 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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195 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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48 views

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
284 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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236 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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1k views

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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66 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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315 views

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 ...
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127 views

Play in headset with no upper bearings on a tandem bicycle

I have a half recumbent tandem bicycle. The front fork headset (under the front cyclist) is loose: I can feel some play when I put the front brake on and try to move the bicycle front and back. I ...
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1answer
355 views

Bearing failure and wheel offset on Chicco Red Bullet

Our 4yo is not yet fully comfortable on her next bike, so she's been riding her Chicco Red Bullet to school - until the bearing packed up on her back wheel today (has she been doing stunts or what?). ...
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157 views

Broken bearing cover near stem

I have a small issue with a bearing cover/seal (not sure how it's called properly) that I would like to fix. I'm attaching the picture for clarity. I imagine I should just replace the part but I have ...
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174 views

Is this hub beyond repair?

I recently took my bike in for a service and they told me that the hub and bearings had worn out and they needed to be replaced. I took the wheel off and rotated the bolt thing going through the ...
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4answers
7k views

Shifting from a Tiagra BB to an Ultegra or Dura Ace BB?

So after about 10,000 miles with my bike I bought in 2015 the bottom brackets have had enough. I need to switch them out, and considering they're quite cheap in retail and also does a lot of the heavy ...
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101 views

Ball size to ball bearing lookup possible

Just found a tiny metal ball in my bike fiddling corner. I haven't worked on any ball bearing since the last cleaning, so I'm a bit confused where it might have dropped out of. It's pretty exactly 3mm ...
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891 views

Sealed bearings characteristics for road bike wheels?

I have fulcrum racing quattro road bike wheels. I'm changing my bearings quite often since I noticed that in general they last around 5000 km (over winter). I'm usualy using SKF 61903 bearings from ...
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3k views

Choosing the proper bearings for replacement

Hub and wheel bearings: Xero 6902 and 6903 LBLU. I can find 6902 and 6903 bearings, usually 2RS, but I can't find that brand (Xero) and type LBLU (what does it mean?). Can I safely replace these ...
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184 views

I can't extract sealed bearings out of the wheel

I face the problem again of extracting the bearings, this time out of the wheel of my Giant XTC Advanced 29” 1.5 2017, Giant wheel system, hub OEM manufactured by Formula. Once removed caps and ...
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1answer
236 views

I can't extract sealed bearings out of hub

I am attaching pictures of the rear hub of my Giant XTC Advanced 29” 1.5 2017. The hub is manufactured by Formula. I am unable to extract the bearings. I'm tapping hard from the side of pawls, ...