Bicycle Mechanics - Bottom Bracket, bolts and tool question

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charles1324
06-04-10, 08:13 AM
Hello everyone,

I thinking about replacing my cup and cone bottom bracket with a cartridge unit. I replaced my crankset this season with a shimano M151 set which is square taper. It looks as if the shimano UN54 bottom bracket will work nicely in this application. The present installation has a spindle which uses a nut to attach the crank, not a bolt, so I will need to purchase the bolts as well. After looking over the different types of bolts available I'm not sure which ones I need so I'm looking for some advice in this area. Also I'm wondering if my present crank extractor tool will work ok with the new bottom bracket, it is a "Lifu Cotterless Crank Extractor". What will the center of the tool push against if it is a female end on the bottom bracket?

thanks,
charlie

FBinNY
06-04-10, 08:55 AM
The bolts are highly standardized and often come with the bottom brackets. You can buy either the newer cap screw (allen) style for use with a hex key, or the more traditional 14mm bolt which uses the tool you already own.

Before buying, check if they're included with the bottom bracket and if not you can pick up a pair anywhere. BTW- if you can't find them cheap, I have a bunch of the 14mm type and can sell you a pair for $4.50 including postage.
Yellowbeard
06-04-10, 11:14 AM
Generally speaking, the crank tool works for both types.