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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46
votes
3answers
18k views

Why do men's bicycles have a top tube while women's bicycles don't?

Bicycles intended for men have a top tube that always hits me on that embrassing part when I brake. Conversely, women's bikes often don't have a top tube. Why is this?
18
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7answers
17k views

Real measurable benefit to ceramic bearings?

Is there a real difference between riding on ceramic bearings and riding on stainless steel? How would you measure it? Does it require it to be every bearing in the drive train, or will each set of ...
14
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3answers
3k views

Should I replace all wheel bearings when only some are worn?

I just ripped apart my mom's mountain bike's rear hub. One of the bearings was incredibly rough, so I replaced it, and the other one was smooth, but didn't turn very easily. Since I didn't have a ...
13
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5answers
10k views

Why only ball bearings on bicycles?

In general, ball bearings are applicable in higher speeds because of the smaller contact area and smaller friction force, but roller bearings can carry greater loads because the load applied to the ...
13
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1answer
3k views

Why do front and rear wheel hubs have different sized ball bearings?

Conventional front wheel cup and cone bearings have 10x 3/16" ball bearings per side, whereas the rear wheel has 9x 1/4" ball bearings per side. Manufacturers have been on a continuous quest over ...
11
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3answers
11k views

Using Anti Seize in place of Grease

I bought Nickel Anti-Seize to prevent any corrosion issues between metals, and I generally like using it on my vehicles on bolts and anything I plan on removing later. I'm wondering where it would be ...
11
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3answers
5k views

What kind of maintenance does a shimano dynamo hub need?

I have a shimano dynamo hub on the front of my bike. Does it need any special maintenance, or maybe it needs just a little synthetic grease once a year, like a normal front hub?
10
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2answers
8k views

Pedal spin resistance a good thing?

I've noticed cheaper pedals (also the <5$ ones) spin forever if you give them a tap with your finger. My own pedals seem to have a little resistance in the bearing. You can turn them with no effort ...
10
votes
1answer
267 views

Why not have the bearings in the forks themselves with through-axles?

Given that we're moving away from QRs to through-axles - partly driven by the torque needs of disc brakes, why not follow the natural progression and move the wheel bearings from the hub to the forks ...
9
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4answers
68k views

When do bearings need to be replaced?

How do I know when bearings need to be replaced? Should I go by time? Or is there a symptom to guide me?
9
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3answers
368 views

Were these bearings defective?

A couple of days ago my girlfriend's bicycle broke. The rear wheel was stuck. Tonight I had finally some spare time to have a look. The bearings had failed, so much so that the wheel must have spun ...
9
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3answers
34k views

Which lubricant/grease to use for ball bearings?

A little mishap happened today during cleaning my bicycle. I tried to take off the sprocket wheel for easier access, but instead I opened the lock nut of the hub (cassette type) and the balls came out....
8
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5answers
21k views

How many balls to put in a bearing?

I'm cleaning out most of the bearings on my new (second hand) bike. I'm replacing the grease inside the pedal bearings and I was wondering. How many ball bearings should be inside? I thought there ...
8
votes
1answer
979 views

Dent in bearing cone, try to get a new one, or can I keep riding like this?

So I opened my rearhub, because there was a lot of dirt in there after 4000 kilometers usage and I found that there is a little dent in the bearing cone. When I slide a bearing ball over that "dent" I ...
7
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2answers
1k views

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 ...
7
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4answers
13k views

Bottom bracket making noise, should it be fixed now or can I wait until regular maintenance?

My bike has been ridden 4 months / 2000 miles and is no longer completely quiet. About a month ago I noticed a whispering noise like a wire brush sliding across a cymbal. It happens on the power-down-...
7
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4answers
5k views

How do I know if my cone/cap/bearings need to be adjusted?

I have a custom road bike with (mostly) Shimano parts. I love to ride but I'm not so strong on the technical side. I have quick-release wheels; I regularly (3-4 times a year) put the bike in a bag ...
7
votes
2answers
749 views

Why are bearing ball sizes measured in imperial units?

Most everything on a modern bicycle is built to metric measurements - see, for example this question. Major exceptions include bearing balls, where metric balls don't even merit mention on Sheldon's ...
7
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1answer
335 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 ...
7
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2answers
6k views

How often should one service headset bearings?

How often should one disassemble one's headset and service the bearings, assuming it's a fairly new road bicycle with sealed cartridge bearings and is ridden every day?
7
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2answers
515 views

Can I replace ceramic bearings with steel bearings?

Bought a second hand bike that needs the hubs serviced. The hubs are Campagnolo Shamal Ultra which have Ceramic bearings. I'm yet to tear them down and take a look at the insides but heres a pic from ...
7
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1answer
1k views

When replacing wheel bearings, is there a standard or are they different for each type of bike

I have a claudebutler CapeWrath D24 (around 3 years old). My front (not sure about rear at this point) wheel bearings need replacing. The wheel it has is a Rigida Zac2000. I realize that some bikes ...
7
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2answers
974 views

Bushings vs bearings - maintenance difficulty

I consider purchasing a full suspension bike with a linkage using bushings, instead of bearings for the pivots (Ghost Path Riot). A review says: The bushings are said to wear out quick, two to ...
7
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3answers
689 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 ...
7
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4answers
2k views

Cause of spalled cones?

Was getting a sort of rubbing sound from my front wheel, like rubbing brakes, but the sound continued even with the bridal loose. So I disassembled my front hub. Everything looked good until I got ...
6
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2answers
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 ...
6
votes
3answers
444 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 ...
6
votes
2answers
121 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 ...
6
votes
1answer
99 views

Non standard hub bearing?

I need to replace a hub bearing. On it, I can Read ZPL (manufacturer I guess) and 6200RS. 6200 seems to be a standard for (inner diameter x outer diameter x width) 10 x 30 x 9mm. But when I measure, I ...
6
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2answers
144 views

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 ...
6
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1answer
256 views

How much do ball bearings wear?

I have a rescued bike with rear Maillard Helico Matic hub. I decided to replace the ball bearings and removed the old ones. Cages, balls, and cones looked ok. I measured old balls and they were cca. 3,...
5
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3answers
10k views

Can a front wheel have a different number of bearings on each side?

I took my old, filthy bike apart to clean it up. I have never done this before! When I took the front wheel bearings out, I ended up retrieving 9 from one side and 10 from the other. It seems like ...
5
votes
2answers
637 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 ...
5
votes
3answers
4k views

How to properly remove bearings from shouldered-axle track hub

I am trying to learn the right way to remove bearings from a track hub. The bearings are cartridge bearings pressed into the hub. The axle has a ridge that prevents it from being removed while both ...
5
votes
3answers
4k views

How to minimize damage from pitted cones?

While working on a old 60's Raleigh I found that there is slight pitting on one of the cones on the front hub (rest of the hub is good). Ideally I would replace the damaged part and move one, but ...
5
votes
1answer
308 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 ...
5
votes
4answers
287 views

Uneven friction in front hub after rebuild

I serviced my old mountain bike after 6 years of use. This included replacing balls and regreasing the hubs of the bike. When I tightened the lock nut on the front axle and checked for wobbling the ...
5
votes
1answer
2k views

When to replace FS bearings?

I know that when a fork stops working plushly, it should be serviced in order to escape permanent damage. When a chain is noisy, it should be oiled, and when it is worn - replaced - again to prevent ...
5
votes
1answer
157 views

Replacing bearings in pivot links

I'm replacing all bearings in pivot links on my full suspension bike and for one of them seems to have more space around bearing itself (housing? if that is right term). I can pop it out and insert it ...
5
votes
1answer
2k views

How to maintain platform pedal bearings?

I have a pair of Redline platform pedals with plastic end caps and I notice one of them does not turn freely. They look about like this: http://www.redlinebicycles.com/uploaded/dynamic/430/124564-...
5
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3answers
3k views

Will slightly loose bearings result in damage?

I just overhauled some cheap bmx hubs. I installed new bearings and cones. Now I'm trying to get the hubs adjusted so that the bearings will last as long as possible. I had always thought that ...
4
votes
3answers
267 views

Is this cone nut in proper condition?

This is the original cone nut of a new coaster brake hub I bought recently. I didn't install it yet, it's new. What bothers me are those weird stains / corrosion signs on the bearing surface. It ...
4
votes
2answers
906 views

Can I replace this bearing? (MTB head tube)

As you can tell from the pictures below, it's about time I did. I'm clueless as to where I'd get new a one. From this answer I think I can conclude it's an integrated one as opposed to a press-fit one,...
4
votes
1answer
18k views

How do I prevent play in the steering post?

I recently changed my handlebar stem to an angle-adjustable variety and now there is a little bit of play in the bar coming up from the front suspension through the frame, onto which that stem is ...
4
votes
1answer
216 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, ...
4
votes
2answers
2k views

What qualities of bicycle bearing grease?

What are the qualities of bicycle bearing grease that make it suitable for that use? (The reason I ask is that I need to get some and I'd rather get the non-bike equivalent grease at the auto parts ...
4
votes
1answer
145 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 ...
4
votes
3answers
1k 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 ...
4
votes
1answer
866 views

Prevent wheel bearing from coming loose due to disk braking lateral force

I have an entry range gravel bike (Kona Rove AL 2017) with disk brakes and the cup and cone front wheel hub shown in the pictures. There is the cone itself that threads on the axle and a top ring that ...
4
votes
1answer
3k views

What maintenance is required after riding through deep water?

The road where I live is on a flood plain and tends to flood every winter. Despite this, I have continued riding to work through the water. I'm trying my best to dry the bike out at the end of the ...