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  1. #1
    Junior Member
    Join Date
    Sep 2009
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    0 Thread(s)

    Bottom Bracket, bolts and tool question

    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?


  2. #2
    Senior Member
    Join Date
    Apr 2009
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    188 Post(s)
    1 Thread(s)
    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.
    Chain-L site

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  3. #3
    Senior Member Yellowbeard's Avatar
    Join Date
    Mar 2009
    1 Post(s)
    0 Thread(s)
    Generally speaking, the crank tool works for both types.
    I'll eat it first.

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