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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4
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1answer
140 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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23 views

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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3answers
175 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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1answer
84 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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3answers
213 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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2answers
88 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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0answers
67 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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0answers
25 views

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 ...
2
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1answer
90 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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0answers
42 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 ...
2
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2answers
169 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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1answer
114 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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2answers
199 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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1answer
65 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?
2
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2answers
168 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 ...
2
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2answers
748 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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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 ...
6
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2answers
101 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
191 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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2answers
106 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 ...
0
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1answer
137 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
3k 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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2answers
80 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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3answers
463 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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2answers
2k 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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1answer
150 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
186 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, ...
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1answer
52 views

Back wheel lock up, when got off wheel would move side to side [closed]

I have a 29 inch Iron-Horse/Sunday 24 speed. My back wheel locked up, when I got off the wheel would move side to side. I thought I lost bearings, took my freewheel apart and clean. Doesn't look like ...
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3answers
3k views

Remove bearing cartridge on a Formula RX-142 hub

I am trying to replace the free hub side bearing cartridge on this Formula RX-142 rear hub. It came stock on my 2018 Fuji Jari 1.7 and was not available after market and I can’t get docs on it. Do I ...
5
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1answer
91 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 ...
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1answer
169 views

Unstable headset/headtube

I have just lowered the stem on my road bike. The headset components might not be installed correctly. Whenever I hold on to the front brake (making sure the wheels aren’t moving), and rock the bike ...
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1answer
84 views

Question about Wheel Bearings

I live in Virginia and built a wind mill using a bike wheel. Do I need to remove the wheel so the cold weather won't destroy the bearings?
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1answer
96 views

Front wheel bearings change

I have a mountain bike - can the front wheel can have 1/4" bearings? I know that the standard ones are 3/16" but I think mine came with 1/4" The reason I am concerned is because I changed my front ...
2
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1answer
359 views

Pedal: Platform came off axle which remained in crank

I have Shimano PD-T780 pedals. I bought them almost new only a year ago and they aren't cheap pedals. On one pedal, the platform suddenly came off, revealing an axle which tapers off towards its end ...
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2answers
292 views

What road hubs models or manufacturers use replaceable cartridge/sealed bearings? [closed]

whilst opinions differ on which is better, cartridge bearings (aka sealed bearings) vs loose-ball bearings. I'm attracted cartridge bearings based hubs, because of the prospect of just periodically ...
2
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1answer
816 views

Purpose of locknuts+adjustable nuts on sealed hub bearings

What is the purpose of these locknuts? How tight should they be? EDIT: I'm asking because even if I remove all the nuts from the axle, leaving just the axle and the bearings, it still won't have any ...
3
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1answer
137 views

Self extracting crank preload

This question got me wondering about self-extracting cranks: What bottom brackets are compatible with Miche Evo Max cranksets (self-extracting type)? Where I've seen them on cartridge bottom brackets,...
4
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3answers
247 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 ...
6
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2answers
447 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 ...
4
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1answer
721 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 ...
3
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1answer
90 views

MTB Bottom Bracket vs. Normal Bottom Bracket

I am planing a Surly Trucker Disc Travel-Bike build and now I am stuck on the bottom bracket bearing. The bearing shell is 73mm wide. Is it possible to install a Sram DUB Innenlager BSA 68/73mm? I am ...
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1answer
103 views

Bearings Cooked? [closed]

I have a Trek mountain bike. It is not new by any means. The back wheel should not freewheel, correct? I am having the back wheel spin freely and I question the bearings.
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2answers
794 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 ...
4
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4answers
241 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 ...
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1answer
227 views

How many miles to repack bearings or replace on recumbent

I have a Sun EZ-1 Super Cruzer recumbent. It is the low end bike. It is beginning to be harder to pedal. Got at least 5,000 miles on it and never bearings have never been repacked or replaced. ...
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 ...
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1answer
122 views

Bearings jammed up even though there is play

I've got a cheap new rear wheel. Disassembled the cones etc and replaced with my own grease. When trying to adjust the bearings to the correct tension, it gets to a point where the axle will make ...
2
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2answers
1k views

Clicking noise in rear wheel that stops on load. Bearings?

The bike is a Merida Speeder 10 flatbar and about a month old. I've noticed a rhythmic clicking from the rear wheel. At first I thought the wheel may be bent and the break pads were catching, but ...
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1answer
113 views

Can standard cartridge wheel bearings “shrink” over time?

My front wheel has started to wobble a bit at the hub and it's most noticeable when braking at the lights, as the front wheel is doing like a "pulsing" sound when braking - like as if the wheel is off ...
6
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1answer
235 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,...