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  1. #1
    Junior Member
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    Trek Earl Chainring change

    I would like to change the chainring on my Trek Earl to a 46 or possibly a 48 and change the crank also. Anybody know what type and size (square, splined) of BB is installed at the factory? I was looking at the Omnium or the Sugino 75 cranks. There isn't much in the way of specifics on Trek's website or in the manual.
    Last edited by oneidabow1; 06-03-14 at 11:14 AM. Reason: additional words

  2. #2
    Veteran Bastard Scrodzilla's Avatar
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    Considering your two choices, it doesn't matter what length or type spindle your current BB has.

    If you get Omniums, they don't use a traditional spindle and include a GXP BB specific to that crank. If you choose Sugino 75s you will need to use a BB having a 109mm ISO spindle, which I am 100% certain your stock BB does not have.
    Last edited by Scrodzilla; 06-03-14 at 11:52 AM.

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