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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.

2
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2answers
76 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
votes
1answer
115 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
180 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 ...
1
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2answers
58 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 ...
5
votes
1answer
133 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 ...
2
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1answer
386 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 ...
2
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1answer
96 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 ...
4
votes
1answer
140 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, ...
0
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1answer
47 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 ...
2
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3answers
384 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
votes
1answer
75 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 ...
0
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1answer
60 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 ...
1
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1answer
80 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?
2
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1answer
89 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 ...
3
votes
1answer
156 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 ...
2
votes
2answers
157 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
294 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 ...
4
votes
1answer
96 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,...
2
votes
2answers
107 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
votes
2answers
285 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
votes
1answer
409 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
votes
1answer
60 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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votes
1answer
99 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.
7
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1answer
448 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
votes
4answers
180 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 ...
0
votes
1answer
145 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. ...
14
votes
1answer
2k 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 ...
1
vote
1answer
97 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
votes
2answers
755 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 ...
1
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1answer
95 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
votes
1answer
207 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,...
2
votes
0answers
83 views

Which ball bearings to put in Union K10491 pedals?

I am trying to put a neglected bicycle back on the road. It has a pedals marked with W. GermanyK10491. Google search revealed that they are Union K10491 pedals. I have found good pictures on ebay. My ...
7
votes
2answers
448 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 ...
1
vote
1answer
464 views

Outboard bearing bottoms bracket (hollowtech II) - assessment of wear and lateral play, lifespans & when to replace?

I have a road-version hollowtech II bottom bracket (shimano 105 model - BB-R60). over the last couple of days i noticed a very slight clicking feeling as i pedalled. removing the crankset i find ...
0
votes
2answers
209 views

Failing hub bearings on a beater bike (freewheel) — time to replace the bike?

I run an old Raleigh Michigan that only does about 12 miles per week and lives outside a station mostly exposed to the elements. While replacing the rear derailleur cable yesterday (it had almost ...
3
votes
1answer
136 views

Rear hub loose after several days in the car

Hi all – I'm a bike newbie here with what is hopefully a minor problem and would appreciate some help diagnosing what went wrong before I try to fix it myself / bring it to an LBS. I packed a road ...
2
votes
1answer
452 views

Do I need to remove & service integrated headset bearings when replacing fork?

I'm replacing a suspension fork on a bike with 1 1/8" integrated. I'm following these steps As the fork slides down, have an assistant hold the lower bearings, so they stay up inside the frame. Try ...
3
votes
1answer
2k views

What size are shimano MTB (wheel) hub ball bearings?

I wish to replace the Ball bearings in my Shimano hubs. What is the standard sizing for MTB?
7
votes
1answer
782 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 ...
3
votes
1answer
175 views

Query on bearing / race sizing

I'm looking to replace the bearings in the headset on a brand new GT mountain Bike (they have disintegrated after 4 weeks).They were the caged type but exposed so I can see each of the balls in the ...
5
votes
2answers
469 views

How to remove rear hub covers

I'm trying to service my DT Swiss wheels. I watched some videos that show how to grease cartridge bearings but don't understand how to get to them. I tried to unscrew the ends using two adjustable ...
10
votes
2answers
5k 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 ...
4
votes
2answers
799 views

When overhauling bottom bracket bearings, is it possible to replace loose bearings with cartridge bearings?

I am fixing up an old schwinn continental from the early 70s and was wondering whether it was possible to put cartridge bearings in the bottom bracket
10
votes
1answer
216 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 ...
5
votes
2answers
504 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,...
6
votes
1answer
136 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 ...
1
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2answers
2k views

How to determine correct bearing size for Quando hub?

I'm servicing the Quando hubs on my single speed/fixie bike. This hub uses a cup and cone type bearing assembly. When I removed the cones I noticed that one of them is chewed up badly at the end. I ...
3
votes
1answer
472 views

Single Speed/Fixie Wheels with cup and cone bearings

I need to replace the wheels on my cheap single speed/fixie bike (similar to a mango or purefix bike). The current wheels are 700 diameter deep-v style rims with Quando hubs that use cup and cone ...
4
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2answers
992 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 ...
1
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1answer
997 views

What size is the upper bearing on a 2013 Trek Speed Concept 7.0?

I'm looking to replace the upper head bearing in my 2013 Trek Speed Concept 7.0 but cannot find the item online. Any ideas of a FSA/Canecreek bearing to replace it? Just to clarify, the diagram ...