Help with BB
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Thread: Help with BB

  1. #1
    RoadBikeReview Member
    Join Date
    May 2020

    Help with BB

    Hi Everyone. I need some help i have a 2014 S works allez, with ultegra Di2. I need to replace the BB, however i cannot find out what type it is. The Specialized specs say that it is a 2 piece OSBB, other site say its a PF30-24 with shimano crank. It is a two piece without a sleeve and it is press-fit. I removed the crank and there are no markings on the bearings at all. One thing to note is that the outer cups spin with the cranks. Thanks in advance!
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  2. #2
    'brifter' is f'ing stupid
    Reputation: cxwrench's Avatar
    Join Date
    Nov 2004
    There aren't any 'outer cups', those are reducers that take the original 30mm ID down to 24mm for the Shimano crank. They're pressed into the bearings so yes, they spin. You can search the dimensions for this in about a half a second. The frame is the same inner diameter as any PF bb, 46mm, the only difference is the OSBB shell is 61mm wide and a standard PF is 68. You need a PF30 that will fit your 61mm frame and then put the reducers back in OR you need a PF30 of that same width that had bearings w/ an ID of 24mm. There are millions of these around so I can't imagine it taking much effort to find.

  3. #3
    RoadBikeReview Member
    Join Date
    May 2020
    Thanks for clarifying!

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