Thread: Determining BB spindle length - road crank on a MTB
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Old 09-10-11, 04:36 PM
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ultraman6970
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Shimano UN54 Cartridge BB, JIS - 73x122mm maybe?? THats the longer they have I believe.

The only way to figure it out is measuring how much do you need at each side, doubt is more than 3 mm for each side, that gives you 6 mm more. round numbers 122.
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