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  1. #1
    Junior Member
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    109.5mm Bottom Bracket?

    I have a 2005 Lemond which is supposed to have 109.5 bottom bracket. My current BB, which is frozen to my frame, is an ISIS drive BB. I have can not find an ISIS in 109.5mm.

    My question: Will a 108mm BB work?

  2. #2
    ot.net slave
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    109.5mm is a common Shimano Octalink bottom bracket size ...are you confusing the two systems?

    switching to a 108 from the intended 109.5mm will give you a 0.75mm reduction in chainline and crank/frame clearance. Not too much.

    - Joel

  3. #3
    Senior Member DieselDan's Avatar
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    A 110mm would be a closer match.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

  4. #4
    Junior Member
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    It's definitely an ISIS BB. I'm just not sure what size it is. But the Lemond websize states that all their bikes use a 109.5 English BB.

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