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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-03-14, 11:13 AM   #1
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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
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Old 06-03-14, 11:26 AM   #2
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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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