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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.

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Bearing size for front hub

This is my first time posting, so apologies if I did something incorrectly. I recently bought a used Marin Bobcat Trail 3 mountain bike and noticed the front hub was really tight. After removing the ...
Matt's user avatar
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7 votes
1 answer
589 views

When replacing balls in Shimano cup and cone bearings, is part number relevant or is size the only thing that matters?

Does the shimano part number matter when replacing the balls in cup/cone hubs? The exact part number is unavailable, and the available shimano bearing of right size does not list my hub as compatible. ...
WornChain's user avatar
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4 votes
2 answers
103 views

How do I remove a threaded rear axle with cartridge bearings?

I'm trying to remove the axle in the picture. I think the bearings say "Enduro 6000LLB" on the sides. How can I remove the axle and the bearings? I checked out this post, which suggested I ...
Darren C.'s user avatar
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4 votes
1 answer
132 views

Bottom bracket BSA, brand question

EDIT: I have removed the part of the question about the size and moved it elsewhere, as it is the most important part as of now. I have a bottom bracket that needs replacement (or repair?). The bike ...
sancho.s ReinstateMonicaCellio's user avatar
4 votes
1 answer
203 views

How to degrease a ratchet area that is next to (sealed) bearings?

I'd like to re-apply grease in the ratchet mechanism of a Mavic freehub (the design is similar to DT Swiss and possibly other brands). The mechanism is very simple to unmount, most of the parts that ...
Rеnаud's user avatar
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1 vote
1 answer
69 views

Play in headset

I serviced my headset few times on my new bike, each time without problems. But when I was serviced it few days ago, I had play in the headset that I couldn't get rid of. First I unscrewed top cap, ...
janko's user avatar
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4 votes
1 answer
201 views

BB386 bottom bracket - Is this kind of bearing wear normal?

I had my carbon road bike at service and the BB bearings (again) needed replacing, according to the mechanic, the drive-side one was hardly spinning and the other one also pretty much done with. Can't ...
DoNuT's user avatar
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2 votes
2 answers
110 views

Locating a Horrendous Intermittent Screeching Noise

This noise started after I washed my bike (using only a garden hose) last winter. It's intermittent and I have zero control over when it happens or how loud although pounding the front wheel on the ...
user66598's user avatar
  • 1,097
3 votes
3 answers
1k views

Front wheel bearings RIP after 1 month

About a month ago I bought a Giant contend AR 3, and have been quite satisfied with the purchase until about 3 days ago when the front wheel started to sound... bad... crackling/poping. From what I ...
Ills's user avatar
  • 133
4 votes
2 answers
1k views

Alternative to Shimano TL-PD40 Pedal Tool?

One of my Shimano SP-M520 pedals has gotten quite stiff on the spindle (i.e. the pedal doesn't spin easily anymore). Servicing the bearings requires first removing this nylon nut: And the correct way ...
SSilk's user avatar
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3 votes
0 answers
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Scott 965 hub Problem

Good afternoon, I recently bought a Scott 965, I chose this bike for the beauty of it and the equipment it came with, I wanted to change to a bike with sealed bearings and leave the bearings Sphere ...
Ruben Miguel Silva's user avatar
5 votes
3 answers
1k views

Brand-new pedal bearings are almost seized up, should I adjust them or try to "wear them in"?

I bought a pair of brand new XLC PD-C03 pedals and noticed that the factory must have installed the bearing very tightly. While I still can turn the axle by hand, it takes a fair bit of force and I ...
MaxD's user avatar
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6 votes
1 answer
184 views

Small metal pellets in a new frame

I am working on assembling a new boxed bike (aluminum Kona Libre), starting by tearing it completely down and making sure all components are properly installed, greased and adjusted. The headset felt ...
djwicket's user avatar
2 votes
0 answers
220 views

Headset and BB compatibility Kona Rove LTD 2019

I've got a Kona Rove LTD 2019 and it's about time to change bearings. This is the exact model : https://99spokes.com/en-EU/bikes/kona/2019/rove-ltd I'd like to change headset and BB because they're ...
Florian F.'s user avatar
-2 votes
4 answers
254 views

Confidence in carbon bike frame after sealed bearing replacement

You buy a new bike. The bottom bracket makes a funny noise and needs replacing. For many other product categories (computer with a noisy fan, ...), you'd worry you had a lemon on your hand. It would ...
Sam7919's user avatar
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10 votes
2 answers
1k views

Is this a sign for bearing maintenance?

My steerer tube recently experienced the leakage of some red (dirty) stuff at the bottom, whenever after I washed my bike. I guess it was the lubricant for bearings. Is it a sign for bearing ...
livemyaerodream's user avatar
4 votes
1 answer
83 views

Front wheel (Fulcrom 418 DB) not spinning when tightened

This is regarding Fulcrom Race 418 DB as delivered originally on a Bianchi XR3. Probably used for 5-6000 km. Last week, I went to Belgium for some cobblestone riding in terrible weather. Returning ...
Odd N's user avatar
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0 votes
1 answer
188 views

Ekar compatibility with UT bb and 6805 bearing

So I've got ekar chainset and pro tech bb, didn't have a correct bearings so fitted 6805 which are 7mm width, because its 1mm wider than original I've got +2mm over. Cannot see if it's pulling enough ...
Virmantas's user avatar
2 votes
2 answers
441 views

How to measure sealed headset bearings angle?

I need to find a replacement headset for an integrated system "IS". I can get the required dimensions by removing the fork and taking headtube and steerer tube measurements by using a ...
olliebulle's user avatar
  • 4,119
4 votes
1 answer
1k views

Safely removing DT swiss bearings to re-use them

I have a DT Swiss 350 rear hub and the axle does not rotate freely. Rotation is smooth (not rough) but with noticeable amount of resistance. I have to pinch the axle hard with my fingers to even ...
Art Gertner's user avatar
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3 votes
3 answers
485 views

I've removed the steerer tube for the first time after 20,000 km, what maintenance does it need?

I have a 2010 Specialized Tricross Sport. I've just take the stem, top cap, and spacers off and removed the fork from my bike for the first time in the 12 years/ 20,000km I've owned it. It's never had ...
SSilk's user avatar
  • 4,199
0 votes
2 answers
338 views

Wheel hub adjustment

My rear wheel was wobbly so I tightened the hub bearing which removed the play but caused the wheel to stop rotating freely. Stupid question I suppose, but is the adjustment just a matter of trial ...
Keith Bruford Bennett's user avatar
4 votes
1 answer
178 views

Which side of a ball bearing retention ring is the "open" side?

Park Tool's article on headset servicing states the following (emphasis mine): ... If the headset is using bearing retainers, check the orientation of the retainers before installing. Inspect the ...
Will Haley's user avatar
2 votes
1 answer
97 views

Cranks shift from side-to-side in new (second hand) bike

Just bought a new bike (second hand) and I've noticed that the cranks or perhaps the bottom bracket slides from side-to-side, almost as if the bottom bracket isn't long enough for the bottom bracket ...
Ashton O'Connell's user avatar
8 votes
2 answers
3k views

Number and size of freehub ball bearings for Shimano FH-HG50 (30H 9801)

I need help with an overhaul of the Shimano freehub that comes with the FH-HG50 hub (part no 30H 9801). How many balls go into the inner and the outer race? What size should they have? I have already ...
jaspb's user avatar
  • 123
6 votes
2 answers
259 views

Crankset repeatedly degrades even after bearings and brackets replaced 3 times - what's wrong?

I'm repeating words that the bike shop told me or from a google search. This bike seems to be defective since purchase. It's a Schwinn Men's GTX3 Hybrid with 700c wheels. Within a few weeks the pedals ...
Jack's user avatar
  • 61
5 votes
3 answers
2k views

Which side up do caged bearings go in?

Replacing fork on bike but messed up and didn't keep all the pieces in order as I took the old fork off. Which direction do the caged bearings go? What side of bearings face the cup and which side to ...
Alison's user avatar
  • 1,173
1 vote
1 answer
264 views

How to remove stuck bearing in headtube?

I am trying to service my headset and have difficulties in removing the bearings from the headtube. Those bearings seem to have accumulated some dirt over time and are feeling a little bit grindy. I ...
conste's user avatar
  • 483
7 votes
3 answers
1k views

What stops the axle from rotating against the inner part of the ball bearings in through-axle systems?

With traditional Quick Releases, the fork or frame attaches firmly through pressure (applied by the QR) to the axle. The axle becomes effectively part of the frame or fork. With the (more modern) ...
Sam7919's user avatar
  • 9,246
5 votes
1 answer
288 views

Pivot Bearing Press Fit Tolerances

I have a Privateer 161 mountain bike. Ever since I bought it, most suspension pivot bearings run roughly when pressed into the frame. After the first 3 months I had the bike, I removed some of the ...
Ethan's user avatar
  • 51
8 votes
1 answer
307 views

How can I find the number of bearings in a Shimano MF-Z012 Cluster?

I am repairing an older bike with a Shimano MF-Z012 cluster. with 1/8" ball bearings. Can anyone help with the number of ball bearings for both sides as the cluster has been dis-assemblied and no ...
IanA's user avatar
  • 81
2 votes
1 answer
346 views

What ball bearings for the hub of the front and rear hubs of DT Swiss dt r24 db Spline 2016?

Removed the end caps, but can't read the size w/o removing the bearings since the red side doesn't have any text on it.
T0TTE's user avatar
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2 votes
1 answer
224 views

MTB BSO rear hub – bearing size dilemma

Background I am fixing up an old MTB BSO (MTBSO? Or even MBSO?). I reckon it's from the 1990s or early noughties. My ambition is to do it myself and as cheaply as possible. The fault is that the axle ...
pateksan's user avatar
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6 votes
2 answers
2k views

Is there empirical evidence that SRAM DUB bottom brackets have longevity issues in the BB86/92 format?

It's well-known that bottom brackets designed for a 30mm spindle and a BB86/92 press-fit bottom bracket shell (41mm internal diameter) will have reduced lifespans due to the very small bearings that ...
Will Vousden's user avatar
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4 votes
3 answers
689 views

Can QR cause Brinelling in hub bearing?

I received a new bike with a rough front hub bearing. Turning the axle indexing is noticeable, that when slowly turning the bearing it repeatedly snaps into the same position. It is a cup-and-cone ...
gschenk's user avatar
  • 9,778
4 votes
5 answers
820 views

Chain is jumping regularly on every cog at every speed?

I have a new chain on a used bike that has been working perfectly for 500km and the chain has started jumping a cog on every different speed. It definitely feels like a cog and chain slipping, the ...
bandybabboon's user avatar
5 votes
2 answers
364 views

Does it make sense to change the orientation of unmoving bearing components to equalize wear?

I was intrigued by one of the points mentioned in this question regarding grease fills, namely: [...] which means that the ball bearings get to distribute the load over the entire surface area, ...
MaplePanda's user avatar
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2 votes
1 answer
67 views

Pitting/spalling on a new cup in a hub

It has been said that cones usually are the first to show signs of pitting, but in this case there is a single 0.1-0.3 mm wide dent on a new cup only after 80 miles of use. Therere was no play when ...
u2v2w2 's user avatar
2 votes
1 answer
2k views

Ok to use RS bearings in a scooter instead of ZZ?

I need to replace the bearings on my (3-year-old daughter's) scooter. The bearings it came with are 608ZZ, where the ZZ indicates a steel shield. The bearings I'm seeing on amazon when I search for ...
dB''s user avatar
  • 237
5 votes
2 answers
1k views

Servicing worn out bearings cone

I recently noticed a strange "sand paper feeling and noise" when turning the wheel of my bike, and decided that it was time to learn to service the bearings of the hubs (cups and cones ...
Rеnаud's user avatar
  • 20.6k
3 votes
2 answers
610 views

Finding replacement headset bearings

Today I was trying to service my headset on my 2016 Felt Z95. When I took the bearings off (caged ones) they just fell apart when I tried to clean them. How do I go about finding replcements? Thanks
Charlie's user avatar
  • 611
0 votes
1 answer
822 views

Cannot remove campagnolo zonda freehub

I have tried following tutorial videos to service my Zonda rear wheel bearings - I want to cleanup the grim and regrease the bearings - such as They all show that ...
Learning is a mess's user avatar
5 votes
3 answers
603 views

What non-obvious maintenance should I do after 6 years/~25k km without professional service

I've ridden my commuter and touring bike (cyclocross frame, but with mudguards, rack, hub dynamo etc.) extensively for the last six years and a total of maybe 25 000 km (~15 000 miles). It has seen a ...
Emil's user avatar
  • 400
0 votes
0 answers
176 views

My shimano ultegra quick release is not working because the ball bearing inside got lost, can someone help me to identify the size of it?

Can someone help me because my ultegra caliper quick release system is not working because the ball bearing inside got lost (see picture below)
Melvin Obidos's user avatar
2 votes
1 answer
678 views

I removed my fork from frame, and forgot the order of the headset spacers and bearing races, what do I do?

My bike is the Diamondback Expresso 27.5 and the forks are VAXA 100mm forks and after, when I tried to put them back on, the top tube of the suspension forks wobbles around, even when I've put all the ...
Keyin Liu's user avatar
  • 231
1 vote
0 answers
48 views

Headset bearing dimensions

I've got some IS49/37 headset bearings on order to be used in a custom frame I'm trying to design, the problem is they take a month to arrive. I don't have a technical drawing of the bearings and can'...
dog_blog123's user avatar
6 votes
1 answer
1k views

How is the load of the bike transferred to the hub cartridge bearings with a through axle?

I'm wondering how the load (or weight) of the bike is transferred to the cartridge bearings in the hub with a through-axle setup. Initially I thought that it is the through-axle that transfers the ...
bwindels's user avatar
  • 457
3 votes
1 answer
172 views

Headset replacement for 1976 Sears Roebuck

I am not a bike expert, however I enjoy working on modern single speeds and beach cruisers, and learning as much as I can along the way. I have tried to teach myself, via the internet and by asking ...
Kane Balbo's user avatar
3 votes
2 answers
946 views

Is this axle cone/ball pitting serious?

I took the rear wheel off my bike (80s raleigh with modern wheels, used for short journeys mostly) today, and noticed some uneveness in the rear axle. Disassembled to find slight pitting inside on ...
2e0byo's user avatar
  • 283
3 votes
2 answers
538 views

Hub end cap replacement for a B'TWIN Triban Aero wheel

I have a B'TWIN Triban Aero rear wheel with a Aero 28 hub on my B'TWIN Triban 520 flat-bar. Some heartless **** decided to steal my rear quick release mechanism the other day, losing/also stealing the ...
Sean 's user avatar
  • 31

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