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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-27-08, 12:42 AM   #1
aus10
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bottom bracket question

i was wondering if most bottom brackets are universal as far as what cranksets will fit them. Im looking for a new crankset for my fixed but dont know what will fit. any help?
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Old 07-27-08, 04:41 AM   #2
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What bottom bracket and crankset do you have on the bike now?
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Old 07-27-08, 07:18 AM   #3
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Quote:
Originally Posted by aus10 View Post
i was wondering if most bottom brackets are universal as far as what cranksets will fit them. Im looking for a new crankset for my fixed but dont know what will fit. any help?
They are not.

The thing you first choose is your crankset. Choose wisely, the crankset and your current chainline on your rear wheel will dictate the BB specs.

BB wise there are

1) type of interface (square, octalink, external etc)
2) length
3) type of shell it is supposed to fit (english, italian etc.)

1 is controlled by your cranks
2 is controlled by your cranks and chainline
3 is controlled by your bike

You need to tell us what BB you have on your bike now and your chainline in the rear if you want to re-use it. Keep in mind new shimano square taper cart BBs (JIS) are about $25.
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Old 07-27-08, 10:37 PM   #4
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all i know about my crank is that it says "custom" on the crank arm, and it has a square interface.I got it off of an old GIANT bike. Not even sure of the model of the GIANT...
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Old 07-28-08, 12:14 AM   #5
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Read and learn:
http://sheldonbrown.com/gloss_bo-z.html#bottom
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