The part of your bike that contains the axis the cranks arms spin 'round. (The crank arms are where the pedals attach.)
2
votes
1answer
42 views
Raleigh AT20 series bottom bracket affects derailleur
I took out the bottom bracket to clean it etc taking off the pedal shafts etc - and when it came to putting it back - the front derailleur was well out of adjustment - Have I done something wrong>- ...
0
votes
1answer
24 views
Shimano Ultegra Bottom bracket replacement with Dura-Ace
The bottom bracket on my Van Nicholas Astraeus is a creaking when going up hills. It's already been tightened recently, yet seems to creek more and more lately - probably due to the mileage (many, ...
0
votes
0answers
14 views
BB30 Bottom bracket with GXP Shim
I have a BB30 bottom bracket, and bought the Wheels Manufacturing shim so I can use my GXP power meter. When I used the dust shields that come with the BB30, it seems like the crank spindle isn't long ...
1
vote
1answer
122 views
Replaced Shimano Bottom Bracket, now front derailleur won't shift to largest gear
OK, so in my quest to get my old Trek 7000 ZX MTB running again after a long retirement, I am having an issue with replacing the bottom bracket.
The bike came with a Shimano LP25 that is marked BC ...
2
votes
1answer
88 views
Italian bottom bracket Shimano BB-6400 fixed cup tightening - what tool?
All,
I have a Shimano 600 Italian-threaded bottom bracket (BB-6400) and after riding with it for a few weeks, the fixed cup is loosening. I've since read up about Italian BBs and learned that the ...
18
votes
12answers
27k views
Creaking from cranks/spindle. How to fix?
Recently the cranks on my bike started to creak.
I checked with my usual "bike-bible" Park Tool. They recommended dis-assemble, lubricate, re-assemble.
So I did that.
Remove cranks.
Remove spindle.
...
0
votes
1answer
60 views
bottom bracket Stronglight JP400 equivalents
I need to replace my bottom bracket cartridge because it is knackered. After a bit of reading it seems that there may be many types of cartridge variations (axle lengths, threads, size of square ...
2
votes
3answers
225 views
Failing to unscrew BB - what now?
I have an external bearing BB, that I need replaced (It is quite badly rusted). I opt to do the repair myself. The bike is a Specialized Hardrock, the crank arms are SR Suntour.
Having removed the ...
3
votes
1answer
109 views
Thinking of getting a new chainset
I've decided to get a new chainset as my current 38T Nexus is giving low speeds with my Alfine 8 speed hub. I have my eye on the 45T Shimano Alfine chainset.
Currently I have a square taper bottom ...
2
votes
2answers
460 views
What sort of bottom bracket does a Trek 1.5 2011 take?
My bottom bracket is on its way out.. No longer getting smooth rotation even without chain attached. I was wondering if anyone knew what sort of bottom bracket the frame supports? I've googled but the ...
4
votes
2answers
204 views
Swapping cranks, but the new crank is wider, how do I compensate for this?
I was swapping the cranks and bottom bracket on my karate monkey from a Truvative stylo crankset (Mountain Double, GXP bottom bracket) to a Race Face Evolution DH (Mountain Triple, Race Face bottom ...
2
votes
2answers
219 views
Identifying bottom bracket
First and foremost.. I'm slowly trying to replace my bottom bracket.. it makes a kind of knackered-bearings sound when I move the pedals round without the chain attached. This is because I've been bad ...
2
votes
1answer
201 views
Why does my non-drive side crank arm come loose?
I tighten the bolt super hard. Ride for a while. Then it comes loose again. I don't know if its my BB or the bolts. How can this be fixed??
4
votes
4answers
344 views
English vs Italian bottom bracket - chainline considerations
I'm planning a new build and for the first time, I'm working with a frame that requires an Italian bottom bracket. My question isn't specific to the build, but a general question about chainline.
...
2
votes
0answers
93 views
Claud Butler Tandem - transmission issues
I'm in the process of stripping a SWB Claud Butler tandem so I can get it repainted. There are a couple of things I need help with....
a) Can you fit a front mech to the bike, and if so, are there ...
1
vote
2answers
381 views
Bottom Bracket Size for Specialized Roubaix Elite C2 2009
I think my bottom bracket has worn and I would like to replace it. I was looking at the Shimano 105 BB. BikePedia lists the size as 68mm, which is fine, but there seems to be another dimension. I ...
1
vote
1answer
117 views
How can I use a small Shimano BB on any frame?
I have a Shimano BB-ES25 bottom bracket and 45T crankset that was removed from a Giant-CRX City with an eccentric hub (it had Shimano Alfine internal hub gears).
They have literally never been used, ...
2
votes
4answers
2k 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 ...
2
votes
2answers
173 views
What is causing noise/vibration high power input on right hand (drive side) crank?
I am getting a repetitive grinding sound/slight vibration while fully mashing on my Kona-humu single speed.
Description of Problem
This grinding is more similar to what you would hear from an ...
1
vote
3answers
225 views
I unscrewed the lockring, and *both* BB cups rotated - what's going on?
I'm fixing up an old tandem, and the cup-and-cone bottom bracket at the front sounds very gritty, so I picked up my c-spanner and applied it to the lockring. With a bit of effort, left cup and ...
2
votes
2answers
181 views
What do you call the crankset system type on the Sram Apex?
I see these everywhere, but no one can come up with a consistent name for them from company to company. GXP is the closest I can come to a name for the bottom bracket.
...
1
vote
2answers
716 views
How to properly clean and lube the bearings on a sram apex bottom bracket (GXP)?
For this bottom bracket type I am not sure you can take the bearings out to lube them. How do I get grease in there. Also how do I get the old grease out? Does it even matter?
I found this video ...
5
votes
2answers
266 views
Creaking bottom bracket
I have a Trek 3900 Mountain bike that had a serious creaking problem whenever I would pedal. I found that the ring that holds the Shimano sealed bearing was really loose. I tightened it up and it ...
1
vote
1answer
427 views
Removing bottom bracket from 79 peugeot frame
I would like to remove the bottom bracket from an old french peugeot race frame. I believe the frame was built in 79 judging by the decals and stamp on the bb.
The bottom bracket and spindle at the ...
2
votes
2answers
624 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 ...
4
votes
1answer
1k views
How can I tell the difference between a J.I.S. and ISO square taper bottom bracket?
I have a square taper bottom bracket. How can I tell whether it is a J.I.S. or ISO taper with a minimum amount of disassembly?
FWIW, it's a Ritchey from 2004. However, it would be nice to get answers ...
7
votes
4answers
203 views
Help needed identifying mystery screws on 1940s tandem
My tandem has two small screws above each bottom bracket, one on each side (so four in total). I've not seen them on any other bike, and I can't figure out what they're for! Suggestions so far have ...
5
votes
4answers
558 views
for a single-speed conversion, is it always necesary to change bottom bracket?
I want to convert my old raleigh, which has 3 chainrings on the front, into a single-speed. Do I have to replace the bottom bracket? I keep hearing conflicting things.
Thankyou.
1
vote
2answers
234 views
New rocky mountain soul 29 making creaks by the bb
Not to sure what it's coming from I don't have the tools to take the crank off or adjust the bb. The funny thing I don't get is that the creak is gone the next time I ride my bike then when I may go ...
4
votes
3answers
356 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 ...
2
votes
1answer
507 views
DBS 10 Speed Conversion - Bottom bracket?
I have dismantled and thrown away the old parts of this DBS 10 Speed bike I'm converting to a fixed-gear. Yesterday I received a 48T Espresso crankset, but now I wonder which bottom bracket to get. ...
7
votes
3answers
4k views
Annoying clicking sound from the bottom bracket
I just purchased a Fuji ACR 2.0 road bike from a guy who bought it three months back but didn't ride it at all. I brought it home and found that it is making a clicking sound when I pedal. The sound ...
2
votes
2answers
518 views
Bottom bracket bearing Issues
Been having some bottom bracket (BB) woes. Noticed a click on the top of the left pedal stroke decided to re-grease the BB. Took it apart cleaned everything re-greased, put it back together.
Roll ...
8
votes
7answers
9k views
How to remove a crank arm with stripped threads?
A friend called me up yesterday after a mis-adventure during his attempt at a bottom bracket overhaul. He stripped out the threads on the (left) crank arm while using a Park crank puller. In a pinch, ...
1
vote
3answers
639 views
Noise from crankshaft spindle and then the pedal falls off
In the last 6 months I have been getting really bad noises, creaks, clunks, etc coming from somewhere around the spindle connecting to the crankshaft. Every time I put pressure down on the left hand ...
1
vote
3answers
1k views
Bottom bracket is ticking
Recently my 2008 Devinci mountain bike sounds like it's ticking when I push down on my left pedal on a usual rotation.
When I turn the bike over and go through rotations, I can't get it to tick.
...
2
votes
4answers
566 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 ...
2
votes
1answer
750 views
Swap Bottom Bracket bearings or replace entire bottom bracket?
I've recently acquired a 2007 Specialized Allez. As I was dismantling the bike for service, I discovered that the bottom bracket bearings are in rough shape. They aren't smooth at all. I took apart ...
3
votes
2answers
392 views
Cutting down cartridge bottom bracket left cup
I have a Tange 68x103 mm bottom bracket (pictured) that I plan to use in an old steel frame (building a single-speed/fixed). It turns out that my non-drive-side bottom bracket shell threads were a bit ...
12
votes
3answers
4k views
How do I know when to replace my bottom bracket?
With out completely removing the cranks and bottom bracket, how can I tell when it's time to replace my bottom bracket?
The current symptom is a slightly 'rough' feeling when I pedal. It's not ...
1
vote
1answer
222 views
screeching noise in bottom bracket
There is a very loud screeching noise when i pedal hard on the down stroke. Be it moving off or climbing up a hill. It is not coming from the front wheel, which i originally thought came from brake ...
2
votes
1answer
346 views
Can if fit new 105 5700 cranks on my existing 5600BB?
I am refreshing my drive train. I have been running a full 105 5600 set for a couple years. I have an ultegra cassette and chain ready to fit, and I am consdiering crankset/chainring options. Is the ...
1
vote
2answers
249 views
how to replace a bearing on BB7800?
Friends,
Do anyone of you know on how to replace a bearing on BB7800 ?
Do I need a special tool ? or a screw driver, and hammer would be enough to push it out ?
Thanks
4
votes
3answers
458 views
Crank arms are not parallel to each other. What could have caused this?
It is a cottered crank. Crank arms themselves don't seem to be bent. It is a non-cartridge style spindle. Any ideas as to why they are not lining up?
1
vote
2answers
956 views
Will a hollowtech shimano BB fit a bike which currently has an octalink bracket?
I have a mongoose otero elite 2008 and the crankset is broke (wobbling) It's also bent, so time for a new one. I currently have a nice shimano deore crankset from an old bike, but it uses a different ...
3
votes
1answer
631 views
Will I damage anything by not replacing my clicking bottom bracket?
I have a Specialized 2010 Sirrus Sport with a sealed cartridge square taper bottom bracket that makes a clicking noise.
If I don't have it replaced, will I be harming anything apart from the bottom ...
12
votes
5answers
10k views
How often should I grease and repack my hubs and bottom bracket?
I am commuting 7 miles a day (round trip) in all weather in New England (temperate, moderately wet climate, cold winters). Overall I am putting about 1000 miles per year on my commuter bike, a 2009 ...
4
votes
2answers
9k views
How do I measure a bottom bracket?
I need to replace the bottom bracket bearing on my fixie. I plan to get a Shimano UN26, but I note that there are a number of different sizes. The sizes seem to be expressed as 68-110, where 68 is the ...
1
vote
2answers
464 views
Koga touring bicycle bottom bracket loose, does it need replacing?
I have a 2009 Koga Signature high-end touring bicycle (internal hub gear, hub generator, half-open chainguard, ...). I'm cycling around 100 km/week (8½ km one-way commute) plus trips, so I've probably ...
1
vote
2answers
1k views
Stationary bike “clicks” when pedaling - crank axle is moving sideways. How can I fix this?
I've got this stationary bike, a York C202, which has developed a problem - namely it "clicks" when pedaling. This is highly annoying, as there's nothing I seem to be able to do about it.
I diagnosed ...
