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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2answers
2k 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
4answers
665 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 ...
2
votes
3answers
351 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 ...
2
votes
2answers
511 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
941 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. ...
2
votes
1answer
473 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 ...
2
votes
1answer
169 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
329 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
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2answers
720 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
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2answers
625 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 ...
2
votes
1answer
844 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
2answers
27 views

Creaking From Bottom Bracket [duplicate]

I'm not too familiar with the correct terminology for bike parts so please bear with me. I recently bought a mountain bike and have started to notice a loud creaking sound coming from the ...
2
votes
1answer
136 views

How can I prolong the life of my bottom bracket bearings?

I have a bike with Campy components. I've found I need to replace the bottom bracket bearings annually, which is expensive and inconvenient. I do less than 2000km per year on it, largely through ...
2
votes
1answer
82 views

Older Motobecane conversion

I recently acquired an older blue Motobecane Mirage with a great frame and paint. I have stripped it all down and salvaged everything I can (frame, front wheel, handlebars, front brake) but now I'm ...
2
votes
1answer
165 views

Yet another stuck BB. Help me save my frame!

So I have two bikes and a year ago I went through the challenge of unscrewing a stuck BB. The solution was to put the tool in a vice and twist the frame around it. Today I have an even more difficult ...
2
votes
1answer
129 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>- ...
2
votes
1answer
222 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 ...
2
votes
3answers
304 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
474 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
0answers
153 views

What types of BB-axle to crankarms interfaces are there?

On the lowest end, we have the taper/square interface. I believe it is standard i.e. there are no variations in the sizes. image property of VP Components USA Then there is the octalink. Actually ...
2
votes
3answers
297 views

Expected chainline from 103 mm bottom bracket to 107 mm bottom bracket?

Frame Windsor - The Hour Hub Width - 120mm Stock Bottom Bracket Sizing - 68 x 103 mm Miche Bottom Bracket Sizing - 68 x 107 mm Miche Crank Set Requirements - 68 x 107 mm bottom bracket ...
2
votes
1answer
880 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 ...
1
vote
3answers
2k 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. ...
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2answers
2k 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 ...
1
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2answers
283 views

Bottom bracket cup doesn't fit on non drive side

I'm replacing the crankset and bottom bracket on my old steel frame road bike, which looks like this one, so I'm guessing it's from around 1985. I picked up a 68 mm square taper bottom bracket and ...
1
vote
2answers
774 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
749 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 ...
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2answers
332 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
1
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2answers
1k 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 ...
1
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2answers
117 views

Broken bottom bracket? Pedals are pretty loose

Unlike the rest of the broken bottom bracket questions, my bottom bracket does not make any noise or feel like anything is grinding. There is about 1/2cm of play left to right that i can see on the ...
1
vote
2answers
226 views

How to judge BB height visually and the effect on handling?

Is it possible by viewing a bike frame to tell roughly what the handling of the bike is going to be? This current question is about bottom bracket height in the above mentioned respect. I have ...
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3answers
1k views

How long does it take to replace bottom bracket bearings?

How long does it take to replace bottom bracket bearings? Is there anything that can make the procedure take more or less time? How does the type of mechanism affect repair time?
1
vote
1answer
37 views

How do I remove a bottom bracket?

I have managed to remove the threaded locking mechanism of this bottom bracket. However, I can't get the bracket out. I have tried to just bang it out, but it doesn't move. I don't know what else to ...
1
vote
1answer
234 views

How tight should a threaded BB be?

I have an english-thread, octalink Shimano bottom bracket, and a new frame. The frame has been faced before painting. I am not sure the BB is compatible with the frame. When trying to install the ...
1
vote
1answer
166 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, ...
1
vote
2answers
639 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
687 views

Cartridge equivalent spindle length for Shimano BB-6207 116 mm Cup and Cone Bottom Bracket?

I'm building up an old Terry bike and will likely pick up a NOS Shimano 600EX FC-6207 crankset. The corresponding bottom bracket for this crankset is the 116 mm BB-6207 cup and cone. However, given ...
1
vote
1answer
150 views

Bottom bracket mysteriously squeaking

Somewhere from the non-drive side of the drivetrain is coming loud squeak when I pedal hard. The story is long. First I threaded the BB-ES25 incorrectly, and had to spend half an hour with a file to ...
1
vote
1answer
254 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, ...
1
vote
2answers
280 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
1answer
184 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?
1
vote
1answer
131 views

Selecting a compatible BB: spindle offset

Replaced Shimano Bottom Bracket, now front derailleur won't shift to largest gear How do I measure a bottom bracket? I thought the only thing that mattered when replacing a bottom bracket ...
1
vote
2answers
2k 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 ...
0
votes
2answers
140 views

Lower vs. Taller Bottom Bracket Height

The bottom bracket height on some bikes can be adjusted 7.0mm by flipping a "chip" in the shock mount linkage. This also effects head tube angle by 0.5 degrees. Theoretically speaking, What are the ...
0
votes
1answer
164 views

Can't get the drive side bottom bracket cup out

I have an older Raleigh frame that I converted to a fixed gear and the bottom bracket cup on the drive side has been painted over a few times and I can't get it out. This is the type of cup (the one ...
0
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1answer
37 views

Will this crankset fit my bottom bracket?

I've got a 2004 Trek 4300 that I need to replace the crankset on. I was able to look up the bottom bracket size here and see that it's a 73x122.5. I'd like to buy this crankset but I'm not exactly ...
0
votes
1answer
113 views

Soft “Thunk” in the crank

I have a one month old Citizen foldable bike and I have noticed a soft "thunk" when turning the crank. It sounds the same whatever gear I am in. It also seems to go away for a short while if I stop ...
0
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1answer
106 views

Windsor - The Hour - Bottom Bracket Dimensions

I'm looking to replace the bottom bracket in my Windsor "The Hour" since I'm buying a new crank set for my bike. What are the dimensions for the bottom bracket: both shell width and shaft length? I ...
0
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2answers
726 views

New frame bottom bracket and crank compatibility and general stupidity!

I recently bought a Scott CR1 SL 2012 frame to replace a crash damaged frame on my 2009 Boardman Team Carbon road bike. The intention being to move as much as possible across from the old bike on to ...
0
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1answer
283 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 ...