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Thread: BB91 vs BB92

  1. #1
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    Reputation: Lelandjt's Avatar
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    BB91 vs BB92

    My frame says it has a "BB92 integrated bottom bracket".
    The crank I want says it's compatible with "BB91 press fit".
    Are these the same thing? I think Shimano started the idea of press-in bearings that work out to be the same as external cups on a 73mm BB shell. What do they call it?

    My guess is the crank company's (Lightning) website has a typo.
    Last edited by Lelandjt; 11-30-2010 at 11:12 PM.
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  2. #2
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    Only in bike parts and Enron accounting can 90 equal 91 or 92, Shimano call it a BB-91

    http://www.parktool.com/blog/repair-...racket-service

    but it's all the same, with variations
    I'm a member of NSMBA and IMBA Canada

  3. #3
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    Thanks
    Keep the Country country.

  4. #4
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    i have the 2010 stumpjumper expert 29. It has a shimano bb-91. can i switch out the bb-91 for a sram
    bb-92 so i can have a sram xo crankset? are they the same?

  5. #5
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    Quote Originally Posted by mtbcali1234 View Post
    i have the 2010 stumpjumper expert 29. It has a shimano bb-91. can i switch out the bb-91 for a sram
    bb-92 so i can have a sram xo crankset? are they the same?
    Yes. I fact I'm pretty sure you can use the Sram crankset with the Shimano BB.
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  6. #6
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    The non drive side bearing on GXP cranksets is what holds the axle captive (hence the step in the axle) so while they will physically *fit* a shimano BB, they're not designed to be used with the BBs designed for straight 24mm spindles. Truvativ BBs are cheap as chips anyway, I wouldn't bother trying to mix and match...

  7. #7
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    Reputation: frdfandc's Avatar
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    You can install the Sram crank in a BB92 system, but you will need the proper bearings.

    http://www.artscyclery.com/descpage-SHCRM7626BK.html

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