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.
114
questions
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2answers
99 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
votes
2answers
100 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 ...
6
votes
2answers
92 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
85 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?). ...
2
votes
2answers
83 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
125 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
528 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
61 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
153 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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votes
2answers
571 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
votes
1answer
108 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
154 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
48 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
votes
3answers
648 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
79 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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votes
1answer
75 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
82 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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votes
1answer
94 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
200 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
186 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
votes
1answer
442 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
votes
1answer
105 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,...
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votes
2answers
112 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
318 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
479 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
65 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
102 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
votes
2answers
500 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
198 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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votes
1answer
168 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
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 ...
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vote
1answer
105 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
959 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
97 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
213 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
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0answers
93 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 ...
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votes
2answers
479 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 ...
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vote
1answer
526 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 ...
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votes
2answers
225 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 ...
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votes
1answer
153 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
487 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 ...
2
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
819 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 ...
2
votes
1answer
189 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 ...
4
votes
2answers
496 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 ...
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votes
2answers
6k 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 ...
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2answers
859 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
9
votes
1answer
219 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 ...
4
votes
2answers
564 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,...
5
votes
1answer
144 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 ...
