Questions tagged [bottom-bracket]

The part of your bike that contains the axis the cranks arms spin 'round. (The crank arms are where the pedals attach.)

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Is this a pressfit bottom bracket?

https://www.highonbikes.com/products/token-ninja-thread-fit-bottom-bracket-bb386-to-shimano-24mm Is this a pressfit BB? Also, how is this different from: https://www.merlincycles.com/token-ninja-...
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Understanding Shimano UN55 spindle dimensions

A long time ago, I found a document or a forum post that gave me the information I require. However, I can't find it now so I hope one of you knows the answer. Take the normal bottom bracket, BB-UN55, ...
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Do I need to replace bottom bracket and/or cranks for road-to-fixed conversion?

I have a vintage race frame with a Shimano Dura Ace 7400 series double-ring crankset on a Shimano bottom bracket of some kind. I intend to use the frame to build a fixed gear bike. As I understand, ...
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Which Bottom Bracket do i need? 107mm 41

I cant´t find a Bottom Bracket for my Cube two 15 2017. It need a 107mm x 41. Please help me.
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8 votes
2 answers
194 views

Searching for a Pressfit BB replacement for my road bike

I need help finding a pressfit BB (BB386) for Shimano 24mm for my road bike. I have a Felt FR30 2017 bike, I checked the Felt website to find my bottom bracket and it said this: "40- BSA BB386&...
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Is the Neco B910 bottom bracket's square taper JIS or ISO?

I'm looking to replace my cup and cone bottom bracket as my current one has deep grooves on the spindle. Because for some reason replacement spindles (113 total width, 68 shell width) are very ...
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837 views

Are the chainrings supposed to have irregular sized teeth?

I just bought a Shimano Tourney 3 speed crankset (Fcty301 Jts01) and it came sealed in a Shimano bag, that was inside another sealed bag, but when I look at the teeth, they are not regular, some are &...
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Swapping BB and crankset between bikes

I have a 2001 DeVinci Santiago road bike, which has a Shimano 105 road triple crankset and an octalink BB. I'm about to buy a 2010 Masi Speciale CX, which has a Truvativ Touro compact double and a ...
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How should I remove this crankset?

I recently acquired a 10 year old Cube Acid MTB which I intend to refurbish and convert to an ebike. I need to remove the crankset and purchased a crank puller. It seems to be a universal size but the ...
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4 votes
3 answers
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Replace vintage bottom bracket nut

I was cleaning up my vintage bike crank arms, and somehow ended up losing the nuts/bolts that would screw my crank arms back into the bottom bracket. Started asking my bike shops only to find out this ...
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213 views

Replace an FSA Powerdrive Bottom Bracket and Crankset with Square Tapered

I have 2012/2013 (alleged) Kona Ute. I need to replace a the crank arm due to stripped pedal thread. It currently has an FSA Powerdrive 118mm/68mm Bottom Bracket. I am not 100% certain but I believe ...
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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 ...
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How to reattach DI2 battery mount inside downtube of Canyon Endurace?

In the process of looking for the charging port for my Canyon Endurace, I stupidly unscrewed the two screws that hold the battery mount to the inside of the frame, because I thought the piece of ...
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1 answer
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Crankset compatibility: Can I replace Shimano FC-M521 with FC-T4010?

I recently bought a Jamis Coda Elite (2012) second hand. I'm slowly replacing all of the drive train as most of the components are worn. According to p114 of the original product catalogue, the bike ...
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Is there a BB tool that has the Park BBT-69.2 16-notch pattern but can be used with a BB with spindles?

My BB spindle is bottoming-out against the inner wall of the BBT-69.2 even though the spindle is a short one, 103mm; so I would like to find a 3/8 square drive BB tool with the same 16-notch pattern ...
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Remove Shimano 105 left crank arm

I'm trying to remove the left crank arm. I've previously been able to do this with a 10 mm Allen key. But as you can see, this time it's stuck. Does anybody know which tool is best for the job? I fear ...
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Tool for Campagnolo Centaur bottom bracket

What tool do I need to put this Campagnolo Centaur bottom bracket into a bicycle frame?
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Bottom Bracket Axle wobbling while cycling?

The other day, I was riding up a hill and crack, something happened to my front derailleur. The chain rings now wobble back and forth on the horizontal axis as I pedal. I decided to take a look and ...
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1 answer
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Bottom bracket for 1991 raleigh classic man

Got a Raleigh classic man from a scrap shop. Decided to give it a life. The frame is in good condition and managed to get bearing hubs for front and rear wheels. I was wondering what would size and ...
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2 answers
96 views

How to calculate what BB spindle length I need for a mystery crankset?

I'm building up a bike frame with spare/junk components to be my beater bike for commuting. It will be a single speed, chainline on my rear wheel is 42mm. I have a crank set to use, but I'm not sure ...
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4 votes
1 answer
113 views

150mm bottom bracket? Where to buy this?

Can someone explain why I can't figure out where to find a replacement for this? Am I misunderstanding the sizing? Is this a 150mm bb or is that not important? Thanks in advance
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2 votes
3 answers
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BB clicking sound when pedalling hard AFTER greasing everything. Possible worn crankarm hole

I know this may be the most asked question in the biking world, but here I come again. I recently purchased a garbaged road bike that I (almost) restored. One of the many things I did was replacing a ...
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2 answers
102 views

Bottom Bracket Movement

Just like one or two months ago, I had noise coming from bottom bracket and my LBS changed it under warranty. But after few rides (not exactly remember how many) I had a little movement on BB. It ...
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2 answers
306 views

Bottom bracket noise with Campagnolo Ekar

No, not asking about creaking :) On my gravel bike with Campagnolo Ekar (press-fit BB) after removing the chain from the chainring, when spinning the cranks they spin only for a few seconds (I heard ...
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Upgrade bottom bracket

I want to upgrade my bottom bracket (square taper 68x113 threaded) to Shimano hollowtech and fit a new triple crankset. My gears are 3x10 so will my front gears still work with the new set up. What ...
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2 votes
3 answers
146 views

Which bottom bracket for a Campagnolo Mirage 175?

Can anyone advise me which bottom bracket I need for a Campagnolo Mirage 175 groupset? It's going onto an old Dawes Reynolds 531 ST frame. The frame currently has a Shimano BB-UN100 bottom bracket, ...
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8 votes
1 answer
649 views

I replaced my bottom bracket and now my crank arm bottoms out on the square shaft before it can be torqued. What did I do wrong?

I just replaced my bottom bracket using another one of the exact same make and size (Sunlite 68mm x 103mm square tapered shaft cartridge). It installed smoothly and everything seemed to be going well ...
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3 votes
2 answers
713 views

I crossthreaded the bike frame using force on the BB. Can still be saved?

I have a MTB, with "normal" square taper BB, and a 3 chainring crankset from Shimano. After some problems with my pedals, I managed to destroy the fillet on the crank arms too and in the end ...
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4 votes
1 answer
144 views

SRAM GXP crank partially stuck in bottom bracket

I (unfortunately) have a SRAM Apex GXP crankset that I need to replace after less than a year of use because it's garbage. But I can't get the crankset out of the bottom bracket. I've taken the bolt ...
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1 vote
1 answer
131 views

Is my bottom bracket cracked?

I was inspecting my bike a couple of days ago and I found what seems like a crack on the bottom bracket welds (encircled below). I’ve ridden it for less than 150 kilometers. I know it’s hard to tell ...
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Drive side part of bottom bracket is impossible to remove and has destroyed tool fitting

So my old cartridge bottom bracket is about fall apart and i bought a UN55 to replace it. The plastic non-drive side was very easy to remove, but the drive side is literally impossible. I let it soak ...
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3 votes
2 answers
183 views

Converting Threaded BB Shell To Press Fit Shell

I have a bike with worned thread on the BB bracket shell. I talked to a mechanic, and he said that is difficult to repair the shell. The main problem is that he and most bike mechanic here has no tap ...
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1 vote
1 answer
125 views

BB-UN300 vs BB-UN54 bottom bracket durability

These 2 bottom brackets are the most widely available ones in my country. Which is the best in terms of reliablity, quality?
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2 votes
1 answer
125 views

Broken bottom bracket spindle on spinning bike?

So my spinning bike bottom bracket spindle (axle) broke. Anyone know where can I find a replacement? Here is an image and video of broken part
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1 vote
1 answer
118 views

1X11 build - align / slip / set up

Looking for advice on my 1X11 set up on a bike I’m (trying to) build: The chain slips off single front chainring, on the inside, when I move into biggest rear cogs (gear 1 or 2). When I align the ...
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3 votes
1 answer
386 views

Clicking sound when pedalling hard

EDIT: Dropped it off at my local bike shop and the mechanic had the following to say about it: Bottom bracket very low quality, also worn bearings. Due to open frame type was a lot of dirt inside ...
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2 votes
1 answer
127 views

Cottered Crank Bottom Bracket

Can anyone help me identifying the bottom bracket? It had a cottered crank arm but only on one side, the other side has nothing. I have no idea how to remove the spindle. I already tried hammering it ...
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3 votes
1 answer
106 views

What key/wrench to remove this FSA crankset?

I have never worked with bottom brackets or crank arms before. What keys do I need if I want to remove these FSA ones?
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2 votes
2 answers
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Any Cranks/Bottom bracket that can replace syncros cranks/BB on a 2006 Santa Cruz superlight MTB?

My left syncros crank was recently backed into by a car. The cranks are 175 mm. The bottom bracket is also syncros brand, threaded, and the size is 68 x 110mm. I have a syncros triple chainring, 5 ...
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3 votes
1 answer
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Quarq dfour installation

I'm looking into getting a sram quarq dfour power meter, but I'm a bit confused as to what parts I need. I have a Specialized Diverge 2021, which comes with ultegra RX810. I know I need the spider. Do ...
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1 vote
1 answer
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SRAM S2200 - replacement BB30 spindle?

I'm having a hard time finding a replacement BB30 spindle for a SRAM S-2200 (X.0) crankset (originally fitted to a 2013 Specialized Enduro). I stripped the thread on the spindle, but I would like to ...
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0 votes
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New bottom bracket does not fit - am I wrong?

I bought and isntalled this bottom bracket; VGEBY1 68X120mm, Thread info: BSA 34.798mm 1.37*24TPI However the arms was too long. So instead i bought; Shimano UN300 68X 110mm, Thread info: BSA 1.37*24 ...
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3 votes
2 answers
331 views

Missing cover for Square Taper bottom bracket?

I'm assembling my first one-speed roadbike and would love your input. Right now i ordered the wrong size bottom bracket judging by the very large distance to the arms I'm ordering a smaller square ...
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2 answers
89 views

How to match bottom bracket and crankset sizes?

I'm trying to buy a new bottom bracket. But I am not sure if sizes fits together. VGEBY1 Bottom bracket with CYSKY Single Speed Crankset 48tT. The bottom bracket has the following sizes; 68X118mm ...
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1 vote
1 answer
248 views

SRAM NX Eagle crankset on a Shimano bottom bracket SM-BB70

I just bought a SRAM NX Eagle crankset (DUB standard) for my bike but when it arrived I realised it doesn't fit in the bottom bracket installed on my bike (SM-BB70). Is there a way to make it work or ...
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1 vote
2 answers
126 views

BB creaking - gathering info needed for fixing

I've been doing some googling on fixing the annoying creaking in my bottom bracket. It's all good if it's in easy gears. The moment it's in the big front chain ring and small rear gear (ie. I'm ...
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4 votes
2 answers
475 views

Very Stuck Bottom Bracket

I have a very stuck bottom bracket (see image) Just trying to remove the adjustable cup (non-drive side) and the moment, and it's not budging. I'm trying to remove it with a Park Tool Adjustable Cup ...
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8 votes
4 answers
999 views

What type of bottom bracket does my bike have?

I found this old fixed gear conversion on CL for next to nothing. It's been really fun but I've noticed play in what I thought were the crank arms, but it turns out the spindle inside the BB has play. ...
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2 votes
2 answers
321 views

Vintage cup and cone bb

I am restoring an old bike and have got stuck, after removing the lock ring I attempted to remove the spanner fitting as seen on the photos, the fitting is very thin and so the spanner is slipping off ...
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2 votes
2 answers
384 views

Which cartridge bottom bracked to replace cup and cone bottom bracket?

I'm into a bit of historical research. I have a 1986 Panasonic DX-3000 bike with a loose bottom bracket. I haven't opened it up yet (I'll be ordering the required tools for the job while ordering the ...
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