The part of your bike that contains the axis the cranks arms spin 'round. (The crank arms are where the pedals attach.)
1
vote
1answer
56 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 ...
1
vote
1answer
70 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
0answers
44 views
Where can I find a square tapered bottom bracket for my TREK Navigator 200?
I have the crank puller and bracket remover but finding the bearing assembly is daunting. I took it to the bike shop (not where the bike came from) and they took 2-weeks to order the part. I'm not ...
0
votes
1answer
45 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 ...
3
votes
1answer
100 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
190 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 ...
4
votes
2answers
184 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
1answer
182 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??
2
votes
0answers
88 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 ...
4
votes
4answers
320 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
2answers
373 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 ...
1
vote
1answer
114 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
2answers
141 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 ...
2
votes
3answers
209 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 ...
1
vote
2answers
573 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 ...
2
votes
2answers
173 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
1answer
388 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 ...
1
vote
3answers
214 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 ...
5
votes
2answers
244 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 ...
7
votes
4answers
199 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
524 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.
2
votes
2answers
608 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 ...
2
votes
1answer
454 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. ...
4
votes
3answers
336 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 ...
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 ...
2
votes
2answers
499 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 ...
1
vote
2answers
226 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 ...
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.
...
1
vote
3answers
616 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 ...
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 ...
1
vote
2answers
356 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 ...
2
votes
1answer
725 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 ...
2
votes
4answers
542 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 ...
3
votes
2answers
381 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 ...
1
vote
1answer
217 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
331 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
243 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
440 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
901 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
597 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 ...
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
440 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
891 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 ...
3
votes
1answer
455 views
Bottom bracket square taper (cartridge) extraction, too tight in one side
I'm getting weird noises coming from the bottom bracket (BB from now on), and I wanted to extract it to check if the problem is there or not.
The guide video I used is no longer public (free) as when ...
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 ...
3
votes
2answers
583 views
What road double cranksets will work with a 108mm JIS square taper bottom bracket spindle?
So far it seems like the Shimano Sante or Suntour Sprint cranksets are the only ones that would fit my bottom bracket spindle (I am hoping to keep both BB and spindle). Am I missing any possible ...
3
votes
2answers
368 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 ...
1
vote
1answer
162 views
What Bottom Bracket for a 2007 Rush Hour frame?
The stock rush hour bottom bracket is a FSA BB-7420. Would a Shimano BB-UN54 that is 68 X 107mm work in that frame?
3
votes
2answers
423 views
screeching/grinding sound when coasting at speed
2003ish Cannondale six13, all Ultegra.
Frequently, but not always, when I'm coasting at a fast pace, usually down a hill, the bike will start making this hideous screeching/grinding noise. It is ...
2
votes
4answers
525 views
Cruiser bottom bracket is clicking and grinding
My Trek Pure Deluxe 3-speed cruiser has been making a clicking noise when riding for some time. The problem is faint, and is more felt than heard. However, it's been getting worse; it now makes a ...
