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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.

3
votes
1answer
74 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
51 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
94 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
65 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
96 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
144 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
267 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 ...
0
votes
0answers
65 views

Brand new wheel creaky freehub body

I recently bought a Kona Rove ST (2017) gravel bike used for commute, it has no more than 100 km, so it's relatively "brand new". There is a set of Alex Wheel Boondocks on it with Alex's aluminium ...
3
votes
1answer
49 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 ...
-4
votes
1answer
88 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
1answer
225 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
136 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
70 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. ...
12
votes
1answer
979 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
84 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
365 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 ...
0
votes
1answer
82 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
174 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
61 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
280 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
240 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
149 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
99 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
287 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
1k 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
628 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
104 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
333 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 ...
9
votes
2answers
3k 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
566 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
202 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
342 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
123 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
vote
2answers
1k 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
307 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
votes
2answers
608 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
vote
1answer
711 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 ...
45
votes
3answers
15k 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?
2
votes
1answer
62 views

Headset bearing size

I am going to be building a beach cruiser frame with 26" springer forks and 25" apehangers with a 1" headset. what is the difference between 5/32" x 16b and 3/16" x 15b, performance wise? Basically I ...
0
votes
1answer
73 views

Vibrations in one of the pedals [closed]

I feel vibrations in one of the pedals when I put my weight on it. It feels like the ball bearing is broken or something. Is that possible? How difficult is it to fix the ball bearings on the pedals ...
1
vote
1answer
36 views

Where to find a 14.4 mm long and 16.9 mm wide hub cone?

I was servicing my bike's ball bearings in my wheels when I noticed that the rear hub cones need to be replaced, as they are heavily wearing down. I looked online for replacement hubs but none fit the ...
2
votes
1answer
201 views

Headset bearings open to closed type

My XC MTB has open type headset bearings, is it possible to replace them with closed type? The main problem is that I live in a flat and only place where to wash my bike after a muddy or dusty race ...
0
votes
0answers
78 views

Schwinn Spirit Trailer - Bearing Repair

I bought a used Schwinn Spirit trailer and have converted it into a flatbed to use on a self-supported tour. I'm working on the wheels right now, but I am having trouble removing the old sealed ...
3
votes
1answer
106 views

Do the cups of headsets with cartridge bearings wear out?

On my bike I have an FSA headset Orbit X-CX which has cartridge bearrings. I re-grease the headset a few times each year and have recently replaced the lower bearing after ca 13,000 miles. The upper ...
5
votes
1answer
1k 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 ...
0
votes
2answers
117 views

What's the best strategy to preserve vintage headset life?

I recently purchased a complete Dura Ace 7400 set (8 speed, downtube shifters so 7402 parts) with the 7400 headset as well. It's the improved one with the silver race and not the gold one prone to ...
0
votes
2answers
4k views

Grinding sound from rear wheel

I am getting a grinding noise from the rear wheel which has got louder and is causing increasing resistance over the last few weeks (I live in the Netherlands so cycle every day). The cassette has ...
1
vote
3answers
650 views

Rear hub bearing replacement

Bike noob here. I have a Quando rear hub with a busted cap? By cap I mean the cap covering the bearings beneath the cone. This cap is separate from the bearings. It hold the balls in place. Is it ...
3
votes
1answer
219 views

Headset ball bearing size

I replaced my chewed up retainer bearing with a rusted but not so chewed up retainer bearing. What happened to the old one was that it was installed backwards and the retainer itself was completely ...
3
votes
3answers
2k views

How to properly remove bearings from through-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 ...