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  1. #1
    Junior Member
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    What size ISIS BB do I need?

    Hi Mechanistas, and apologies for what feels like a fairly basic question.

    Would appreciate guidance on how to identify the BB size required for my frame.

    I have a never-built Look KG111 frame, for which I'm gathering bits. I would like to use a set of compact FSA Gossamer ISIS cranks and Centaur for the rest of the drive train, and wondered what size ISIS bottom bracket I'll need. I know I it needs to be English threaded, but they come in various sizes - 108 mm, 113 mm, etc.

    Any advice welcome!

    Regards from sunny, dry and windy Melbourne,

    Greg

  2. #2
    me have long head tube TallRider's Avatar
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    ISIS was supposed to standardize bottom-bracket lengths, so if you're using a double crankset (I assume you mean a compact double) for proper chainline with a road (130mm-spaced) rear hub, you'll want 108mm. 113mm is for road triple (or mtb double if anyone wants to do it) and 118mm is for mtb triple.

  3. #3
    Junior Member
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    Thanks timcupery,

    Confirmed my initial thoughts. Much appreciated.

    Greg

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