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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How to remove stuck bearing in headtube?

I am trying to service my headset and have difficulties in removing the bearings from the headtube. Those bearings seem to have accumulated some dirt over time and are feeling a little bit grindy. I ...
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6 votes
3 answers
408 views

What stops the axle from rotating against the inner part of the ball bearings in through-axle systems?

With traditional Quick Releases, the fork or frame attaches firmly through pressure (applied by the QR) to the axle. The axle becomes effectively part of the frame or fork. With the (more modern) ...
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5 votes
1 answer
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Pivot Bearing Press Fit Tolerances

I have a Privateer 161 mountain bike. Ever since I bought it, most suspension pivot bearings run roughly when pressed into the frame. After the first 3 months I had the bike, I removed some of the ...
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8 votes
1 answer
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How can I find the number of bearings in a Shimano MF-Z012 Cluster?

I am repairing an older bike with a Shimano MF-Z012 cluster. with 1/8" ball bearings. Can anyone help with the number of ball bearings for both sides as the cluster has been dis-assemblied and no ...
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2 votes
1 answer
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What ball bearings for the hub of the front and rear hubs of DT Swiss dt r24 db Spline 2016?

Removed the end caps, but can't read the size w/o removing the bearings since the red side doesn't have any text on it.
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2 votes
1 answer
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MTB BSO rear hub – bearing size dilemma

Background I am fixing up an old MTB BSO (MTBSO? Or even MBSO?). I reckon it's from the 1990s or early noughties. My ambition is to do it myself and as cheaply as possible. The fault is that the axle ...
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6 votes
2 answers
440 views

Is there empirical evidence that SRAM DUB bottom brackets have longevity issues in the BB86/92 format?

It's well-known that bottom brackets designed for a 30mm spindle and a BB86/92 press-fit bottom bracket shell (41mm internal diameter) will have reduced lifespans due to the very small bearings that ...
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4 votes
3 answers
598 views

Can QR cause Brinelling in hub bearing?

I received a new bike with a rough front hub bearing. Turning the axle indexing is noticeable, that when slowly turning the bearing it repeatedly snaps into the same position. It is a cup-and-cone ...
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4 votes
5 answers
796 views

Chain is jumping regularly on every cog at every speed?

I have a new chain on a used bike that has been working perfectly for 500km and the chain has started jumping a cog on every different speed. It definitely feels like a cog and chain slipping, the ...
5 votes
2 answers
285 views

Does it make sense to change the orientation of unmoving bearing components to equalize wear?

I was intrigued by some of the points mentioned in this question regarding grease fills, namely: [...] which means that the ball bearings get to distribute the load over the entire surface area, ...
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2 votes
1 answer
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Pitting/spalling on a new cup in a hub

It has been said that cones usually are the first to show signs of pitting, but in this case there is a single 0.1-0.3 mm wide dent on a new cup only after 80 miles of use. Therere was no play when ...
2 votes
1 answer
424 views

Ok to use RS bearings in a scooter instead of ZZ?

I need to replace the bearings on my (3-year-old daughter's) scooter. The bearings it came with are 608ZZ, where the ZZ indicates a steel shield. The bearings I'm seeing on amazon when I search for ...
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5 votes
2 answers
571 views

Servicing worn out bearings cone

I recently noticed a strange "sand paper feeling and noise" when turning the wheel of my bike, and decided that it was time to learn to service the bearings of the hubs (cups and cones ...
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3 votes
2 answers
511 views

Finding replacement headset bearings

Today I was trying to service my headset on my 2016 Felt Z95. When I took the bearings off (caged ones) they just fell apart when I tried to clean them. How do I go about finding replcements? Thanks
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1 answer
209 views

Cannot remove campagnolo zonda freehub

I have tried following tutorial videos to service my Zonda rear wheel bearings - I want to cleanup the grim and regrease the bearings - such as They all show that ...
5 votes
3 answers
548 views

What non-obvious maintenance should I do after 6 years/~25k km without professional service

I've ridden my commuter and touring bike (cyclocross frame, but with mudguards, rack, hub dynamo etc.) extensively for the last six years and a total of maybe 25 000 km (~15 000 miles). It has seen a ...
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My shimano ultegra quick release is not working because the ball bearing inside got lost, can someone help me to identify the size of it?

Can someone help me because my ultegra caliper quick release system is not working because the ball bearing inside got lost (see picture below)
2 votes
1 answer
247 views

I removed my fork from frame, and forgot the order of the headset spacers and bearing races, what do I do?

My bike is the Diamondback Expresso 27.5 and the forks are VAXA 100mm forks and after, when I tried to put them back on, the top tube of the suspension forks wobbles around, even when I've put all the ...
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1 vote
0 answers
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Headset bearing dimensions

I've got some IS49/37 headset bearings on order to be used in a custom frame I'm trying to design, the problem is they take a month to arrive. I don't have a technical drawing of the bearings and can'...
6 votes
1 answer
811 views

How is the load of the bike transferred to the hub cartridge bearings with a through axle?

I'm wondering how the load (or weight) of the bike is transferred to the cartridge bearings in the hub with a through-axle setup. Initially I thought that it is the through-axle that transfers the ...
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3 votes
1 answer
138 views

Headset replacement for 1976 Sears Roebuck

I am not a bike expert, however I enjoy working on modern single speeds and beach cruisers, and learning as much as I can along the way. I have tried to teach myself, via the internet and by asking ...
3 votes
2 answers
304 views

Is this axle cone/ball pitting serious?

I took the rear wheel off my bike (80s raleigh with modern wheels, used for short journeys mostly) today, and noticed some uneveness in the rear axle. Disassembled to find slight pitting inside on ...
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3 votes
2 answers
262 views

Hub end cap replacement for a B'TWIN Triban Aero wheel

I have a B'TWIN Triban Aero rear wheel with a Aero 28 hub on my B'TWIN Triban 520 flat-bar. Some heartless **** decided to steal my rear quick release mechanism the other day, losing/also stealing the ...
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3 votes
2 answers
832 views

Shimano MTB hub with pitting cones

When I disassembled my Mountain bike's front hub (Shimano HB-MT400-B) so that I could clean and re-grease the bearings, I found that the cone on one side was developing pits. There are about 4 small ...
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2 votes
1 answer
409 views

Can I use ZZ (steel seal) ball bearing instead of RS (rubber seal)?

TLDR: is 16100 ZZ (steel sealed) 10x28x8mm bearing good for 8.5inch wheel at 25km/h under 100kg load? Long story, in case someone has better solution: I am in process of replacing my rear-drive e-...
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7 votes
2 answers
677 views

Do I need to remove this DT Swiss ring nut? (360 hub)

I'm swapping bearings on Roval Traverse rear hub, which is said to have DT Swiss 360 internals, 3-pawl. Do I therefore need to remove the ring nut as per normal DT Swiss instructions? If so I'll need ...
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1 vote
1 answer
61 views

Standing on cottered crank scuffs bearings?

I have single speed road bike, with cottered crank and my caged bearings wear out too often, could it be due to me standing on the crank (like elliptical trainer) pretty often e.g. when i need to go ...
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4 votes
1 answer
231 views

Hub bearing preload approaches

I am the owner of a bike with a DT Swiss RWS thru-bolt (kinda like a thru-axle but it fits in regular 9/10mm dropouts) skewer system. I saw in their marketing fluff that one of the supposed advantages ...
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7 votes
2 answers
659 views

Cup and cone bearings: better a little tight or a little loose?

A bike is commonly full of cup and cone bearings: pedals, hubs, bottom bracket, headset etc... The component change but the logic still the same the bearing is in between an axle, a pair of cones and ...
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3 votes
1 answer
128 views

NOS vintage hub vs modern hub

I have an early 80s Schwinn Prelude. I need to replace the rear wheel. The question at hand is should I spend $300 on a pair of NOS (new old stock) Superbe Pro hubs, which have the original 126 mm ...
3 votes
1 answer
345 views

What is the name of the part between a wheel hub bearing and the fork, and where can I find a replacement?

I have a mountain bike (2017 Orbea Loki 27+ H30) and at some point I've lost the piece of the front wheel that fills the gap between the bearing, and the fork. As a result, the front wheel has play ...
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5 votes
1 answer
239 views

Are general-use ball bearings okay?

I lost a ball bearing today. Is it okay to go to a hardware store and pick up a general 1/4 in. steel plain ball bearing to replace it? Performance is not a concern, only longevity of parts.
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5 votes
1 answer
394 views

Off brand bearings for hubs?

I'm looking to replace the bearings a of set of Fulcrum Red Power 29 hubs (RT-004 front and RP9-004 rear). I'm having a hard time sourcing them from Canada and I'd also rather order 2 each rather than ...
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1 vote
1 answer
73 views

Help getting the right headset bearings

I need to change my headset bearings, however, there seems to be so many different variations out there, and I'm afraid to order the wrong parts. Why not just order the same type as the old bearings ...
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1 vote
1 answer
306 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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1 vote
1 answer
196 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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3 votes
2 answers
606 views

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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4 votes
1 answer
207 views

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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0 votes
2 answers
292 views

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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2 votes
2 answers
329 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 ...
1 vote
1 answer
177 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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2 votes
1 answer
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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 ...
3 votes
2 answers
219 views

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 ...
4 votes
2 answers
657 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 ...
1 vote
1 answer
95 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 ...
0 votes
1 answer
206 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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0 votes
0 answers
356 views

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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2 votes
0 answers
60 views

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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6 votes
3 answers
3k 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 ...
1 vote
1 answer
210 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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