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  1. #1
    mtbr member
    Reputation: eurospek's Avatar
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    Sep 2007
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    5,149

    Shimano SM-BB50 vs. SM-BB70 XT bottom bracket

    I have ordered the Shimano M545 36/22T crank with bashguard. When placing the order and talking with my LBS, we both didn't realize that the crank comes bundled with the SM-BB50 bottom bracket. So I ordered a Shimano SM-BB70 XT bottom bracket for $32 on Amazon along with the crank.

    Question is this, do I use the bundled BB or install the one I ordered? What significant difference (if any) is there between the two? Save myself the money or install it?
    Last edited by eurospek; 11-16-2010 at 04:56 PM.

  2. #2
    Former Bike Wrench
    Reputation: mtnbiker72's Avatar
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    Jan 2007
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    15,985
    I would fathom to guess that the XT (SM-BB70) bottom bracket is a slightly higher quality unit...maybe better seals and/or grade bearings and races. Since you already ordered it, I'd probably install the better of the two and keep the other as a backup.

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