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.)
685
questions
4
votes
2
answers
8k
views
Bottom bracket lock ring loose - how should I tighten it
I can feel so laterial play when grab hold of the crank arms then wiggle it side to side. I discovered the lock ring was very loose. So much so i could turn it with my fingers without any effort.
...
- 1,097
4
votes
3
answers
5k
views
Does anyone have experience with Bottom Bracket Tap/Facing sets?
I'm interested in recommending my boss get the workshop in which I work a bottom bracket tap and facing set.
As it's quite an investment it's important to me to know what you're getting for your ...
4
votes
1
answer
392
views
How to remove and replace wire pins from axle?
I have a Kent adult tricycle. It has a band brake attached to the rear axle. The brake pad is old and no longer grips, so I need to replace it. Apparently I can't just replace the pad because it is ...
- 143
4
votes
2
answers
314
views
Rotor Crank and BB Rubbing Noise on Road Bike
Just bought a new Corratec CCT Evo and there has been an annoying noise from the crank. It's a rubbing noise that is always present when pedaling at any cadence or power.
Listen here: https://...
4
votes
1
answer
1k
views
Achieving Correct Beltline for Gates Carbon Drive
I’m building up a Soma Wolverine with a Gates Carbon Drive and Alfine 11 internal gear hub. The Gates literature indicates that the beltline should be 43.7 mm +/- 1mm.
I am trying to use an old ...
- 251
4
votes
2
answers
2k
views
How to remove this eccentric bottom bracket?
One of my bikes has an eccentric bottom bracket with a Gates belt drive and a Shimano Alfine 11 IGH.
For a few days now, I've experienced some creaking noise when pushing on the right pedal. Even ...
- 517
4
votes
2
answers
8k
views
Bottom bracket replacement advice needed for BBright BB386EVO
I've got a Giant TCX SLR2 (2015) according to the spec sheet it has:-
Crankset: FSA Gossamer Pro Cross, 36/46
Bottom Bracket: FSA MegaExo
The other day I noticed the bottom bracket isn't sounding ...
- 41
4
votes
1
answer
1k
views
Will this power2max power meter be compatible with Cannondale Synapse?
I have a 2015 Cannondale Synapse - specifically, this one: http://www.swiftcycles.co.uk/334/products/2015-cannondale-synapse-carbon-105-6-road-bike.aspx. I would like to add a power meter, and ...
- 173
4
votes
1
answer
576
views
How do i remove my crankset and bottom bracket?
I have a Specialized Hardrock I'm trying to remove the crankset and bottom bracket from. It's a square taper crank and I do have a Parktool CWP-7 however I have yet to understand how to use it exactly ...
- 1,123
4
votes
5
answers
17k
views
SM-BB52 vs BB-MT800
My SM-BB52 is reaching its end of life. It is third time I am replacing it over last decade. Generally cannot complain as new fitted part usually lasts me 2-3 years and replacement procedure is rather ...
- 2,597
4
votes
1
answer
2k
views
JIS and ISO square taper
I've read Sheldon Brown's page on JIS and ISO and have read exchanges in forums about the pros and cons of using ISO cranks on JIS bottom brackets.
If my understanding is correct, these standards ...
- 1,146
4
votes
1
answer
635
views
What are the metal shavings in my bottom bracket from?
I opened up my FSA BB30 bottom bracket to find metal shavings all around. I opened up the bracket to try to find the source of a creaking sound, I’m guessing this is it - but I’m not quite sure what ...
- 400
4
votes
4
answers
17k
views
Cause and diagnosis of wobbling crankset/chainring
I was replacing the chain recently.
When spinning the crank I noticed that the chainrings are slightly wobbling along the axis. I was able to see the wobbling with my eyes.
First check
I kind of ...
4
votes
1
answer
13k
views
How to pick a crank puller?
I need to get a crank puller for my square-taper spindle. There are several available on eBay and Amazon. What information do I need -- about the puller, my bottom bracket and my crankset -- to pick ...
- 2,501
4
votes
1
answer
106
views
Old Colner (Campagnolo) frame - What bottom bracket do I need?
Just picked up an old steel Colner frame. Don't know model or year.
Tried to put my Sugino bottom bracket in but it's too small.
The width of the frame where the bb goes in is 70mm, and internal ...
- 41
4
votes
1
answer
69
views
Bottom cartridge noise
I have a Shimano UN26 cartridge bottom bracket (68 x 123) now making a noise but cannot detect any wobble on the non-drive side at the same position around 11 o’clock position. I’ve checked ...
- 41
4
votes
1
answer
264
views
How to loosen eccentric BB shell?
I have a one-year-old REI CTY 1.3. Aluminum frame, belt drive, with an eccentric BB shell for tensioning the belt. The bottom bracket itself is a standard Shimano BB-RS500, but I cannot identify the ...
- 201
4
votes
2
answers
698
views
Bottom bracket conversion with rare cups
I'm asking this question as I'm interested in the community opinion in the idea of "am I taking the right path" or "is there a better way".
tl;drl; - scroll to the bottom, please.
Namely, almost ...
- 4,341
4
votes
1
answer
5k
views
What went wrong with my bottom bracket spindle length calculation?
Here's the facts:
My bike frame requires a 70 mm Italian threaded bottom bracket
I'm going to use a Nuvinci N360 IGH which requires a chainline of 49 (± 0.5) mm.
I have Andel fluted cranks, which ...
- 181
4
votes
1
answer
770
views
If external bearing BBs are better, why use traditional ones?
Related:
What are the benefits of external bottom brackets?
An outboard BB includes any BB which uses the same BSA or Italian threading as older style BB's, but places a larger bearing outside the ...
- 13.7k
4
votes
2
answers
669
views
Chainline on a trek 660 fixie conversion
I am converting an old Trek 660 frame to fixie. It takes a 68mm bottom bracket and I'm putting in an SKF bottom bracket (like this) with both a BMX profile racing 110mm 46t and redline BMX cranks ...
- 41
4
votes
1
answer
75
views
Silverback Bottom Bracket Replacement
I have removed the bottom bracket from my bike as it was very wobbly. I am trying to teach myself about these things and I am making progress however the bottom bracket looks weird. Granted I have not ...
4
votes
1
answer
124
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 ...
4
votes
1
answer
183
views
Bottom bracket has play. Can I still tighten this, or do I have to replace it/fix it properly? Tools? (incl. videos and photos)
I'm staying with a relative and borrowed her bike for a ride. It now has play on the bottom bracket - as shown in videos below.
TL;DR
Is it possible to judge if I can still just tighten this, or do I ...
- 2,314
4
votes
2
answers
793
views
Brand new Shimano BB-UN300 hard to spin when drive side is fully torqued
I'm installing a brand new BB-UN300 (68x122mm) into a 1991 Specialized Sequoia (replacing the pitted cup and cone BB). Out of the box, the BB doesn't spin very freely by hand, but that's to be ...
- 538
4
votes
1
answer
255
views
What bottom bracket removal tool do I need?
I haven't been able to find a bottom bracket tool for this specific spline count/pattern. It looks like it might fit a standard 20-spline one, but I'm not sure since there are actually only 16, but ...
- 73
4
votes
1
answer
130
views
Noise from bottom bracket
I'm getting a strange cracking noise out of my bottom bracket. It started after I tried to pedal harder on a higher gear. What might be causing the sound? The bike is new and can it be the bearing?
- 43
4
votes
2
answers
875
views
Worn out square taper bottom bracket spindle?
I got an used bike with a worn out left crank arm. I tried replacing with a new square taper crank arm and torqued it to 40nm; however, it started creaking soon after and the bolt had become loose (I ...
- 177
4
votes
1
answer
200
views
What is this bottom bracket
We were doing a volunteer bike repair clinic and came upon this bottom bracket that I've never seen before. It was on a trials bike and the crankset was destroyed but we couldn't find any way to ...
- 21.7k
4
votes
1
answer
1k
views
What bottom bracket is this and why does it have a lockring?
After watching some videos I'm pretty sure that the BB on my bike is a three piece square taper type.
After a short search I couldn't see any any videos or articles on how to remove a BB which has ...
- 271
4
votes
2
answers
3k
views
Replace asymmetrical BB with symmetrical cartridge and spacers?
My bike has a square taper 68mm width cup and cone bottom bracket that is wearing out. I was hoping to replace it with a sealed cartridge (shimano UN55 or similar) but then I found that the spindle ...
- 135
4
votes
3
answers
4k
views
Clacking noise as right crank goes 'over the top' once per revolution
Every time the right pedal goes over the top I get a single clack noise with a little more 'travel', a point where the bottom bracket moves without any resistance, from that point in the rotation. I ...
- 387
4
votes
1
answer
4k
views
Square taper crankset develops play after changing bottom bracket
After replacing a bottom bracket with square taper I repeatedly have to tighten the screws that fix the crankset (on each side) to the bottom bracket axle or otherwise I can feel sometimes a slight ...
- 1,959
4
votes
2
answers
9k
views
Can I measure my bottom bracket size without removing the cranks?
I don't have a LBS (there are BS, but not L), so I generally order everything I need online. I need to replace the bottom bracket on my commuter bike, which I know is a VP-BC73 but that BB's available ...
- 145
4
votes
2
answers
1k
views
Attaching crank arm with Shimano SLX M660
Firstly, apologies if this question has tones of frustration, my new crank set and bottom bracket has never been installed correctly, so I am going to do it myself.
Should the drive spline on the ...
- 183
4
votes
1
answer
198
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 ...
- 4,431
4
votes
1
answer
263
views
BB386 bottom bracket - clicking noise once per rotation
I've been posting quite some videos about defects on my bike her recently, so I seem to be a winning streak.
On my last ride, a strange noise started to occur on my bike. Might be that it was ...
- 4,431
4
votes
1
answer
165
views
BB86 Bottom Bracket too long?
I upgraded my 2016 Canyon Endurace with a C-Bear BB86 DUB ceramic bottom bracket to fit a Quarq PM. The BB didn't last a year, but I managed to get a replacement on warranty. The BB I received was ...
- 41
4
votes
3
answers
11k
views
Is movement in my bottom bracket an issue which requires attention immediately?
TLDR; my bottom bracket has movement when it shouldn't but no other issues / sounds / clunking. If I'm riding a few miles a day, is this likely to break catastrophically, or will it last another year ...
- 43
4
votes
1
answer
665
views
Bottom bracket length without knowing front chainline (fixed gear)
I'm wondering if I can find the right bottom bracket axle (or spindle, whatever it's called) with knowing my crank model (Gipiemme Dual Sprint, Velobase says BB should be 113mm) and rear chainline (I ...
- 41
4
votes
2
answers
1k
views
What direction are the threads on Ultra Torque bearing cups?
I need to remove the bottom bracket bearing cups from my 2010 Athena groupset. Do they both unscrew anti-clockwise, or is one side different (and which one)?
- 1,347
3
votes
5
answers
7k
views
Bottom bracket with built-in internal hub - does this exist?
I've heard that one can install a bottom bracket that has what is essentially a built-in internal hub, giving one the ability to add a virtual double chainring where there's only one. This would be ...
- 17.9k
3
votes
4
answers
3k
views
French thread BB
I am commuting and training on an old Peugeot road bike. I really like it but as training rides are getting to be 100km or more, I need to add shorter cranks and clipless pedals.
Problem is these old ...
- 106
3
votes
2
answers
19k
views
Bottom Bracket Lube?
Lately, after my normal wash & lube routine, I've been squirting a little Teflon lube into the bottom bracket hub. I do so without dissembling by inserting the lube straw into the hub crevice. Is ...
- 175
3
votes
4
answers
20k
views
Cross threaded/stripped bottom bracket
I installed a new sealed bearing in my bottom bracket. Unfortunately after tightening it most of the way, it jammed and I realised I'd cross threaded it.
I then removed it and reinstalled it. It ...
- 9,136
3
votes
3
answers
3k
views
How can I remove a stuck bottom bracket cup?
I am repairing the bottom bracket of a US$100 bike with hard 2,000 miles (3,200 km). At approximately 1,800 miles (2,900 km) the bottom bracket made a crunchy sound, and after that there was a lot ...
- 395
3
votes
2
answers
275
views
BV-217 Antler bottom bracket service or replacement
I have a BV-217 Antler
It is at least 7 years old and has had minimal maintenance, if any. I am stripping it down to its bearings and cleaning, re-greasing, reassembling etc.
I am stuck at the ...
- 133
3
votes
2
answers
1k
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 ...
- 31
3
votes
3
answers
2k
views
How do I remove this style of bottom bracket?
I am attempting to remove and replace the bottom bracket from a cheapish 1970s American department store road bike. I've gotten the lockring off, and now the non-drive side looks like this:
[Whoops, ...
- 562
3
votes
2
answers
542
views
What crank arm bolt is required here?
The crank arm on my Decathlon Triban 520 became loose during a cycle. On inspection the crank arm bolt is missing. What bolt do I need as a replacement? (Or how can I figure it out?)
The manufacturer ...
- 201