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  1. #1
    Senior Member Sincitycycler's Avatar
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    Road/fixie conversion: What bb spindle length to use?

    I'm looking at some old steel Schwinn frames on ebay to make into a fixed gear.
    How do you determine if you need a 68x103 or 68x108, etc. in the bottom bracket?
    "How did all those 'Keep Off the Grass' signs get there?"

  2. #2
    hello roadfix's Avatar
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    Spindle length (103 vs 108) is mostly determined by the crankset.

  3. #3
    Your mom
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    Choose a crankset, use its designated BB spindle length.

  4. #4
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by roadfix
    Spindle length (103 vs 108) is mostly determined by the crankset.
    Spindle length is EXCLUSIVELY determined by the crankset and the desired chainline.

    See: http://sheldonbrown.com/bbsize

    and: http://sheldonbrown.com/chainline

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