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  1. #1
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    New question here. Square Taper Crank BB.

    So I picked up a 07 Surly 1x1 frame and I would like to run my square taper crank that I have on my 98 GT Tequesta I converted to a single speed.

    The bottom bracket width is 73mm on the Surly and 68mm on my GT.
    I donít know what spindle length I should run on the Surly though.
    My crank set is a SR AP-36, 22/32/42 teeth

    SheldonBrown didnít have any info listed yet on this crank set either.

    So how would I figure out what length spindle I need for my bottom bracket?
    Pedaling Gorilla

  2. #2
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    The complete troll is spec'd with a 122 mm spindle so I'd start there. You might have better luck in the surly forum though.

    What is your rear hub though? On singlespeeds that drives your chainline needs more than anything else.
    Yeah I only carry cans cause I'm a weight weenie.

  3. #3
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    My rear hub is a old school Shimano STX-RC.

    Surly has the spec sheet of the bike from 07 on their site but nothing referencing spindle length.
    Pedaling Gorilla

  4. #4
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    Spindle length is determined by the cranks, not the frame (for the most part). I'd run the same spindle length as you did in your old frame.

  5. #5
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    ^Okay I guess that does make sense.
    Pedaling Gorilla

  6. #6
    1*14*29*2.1 & 1*1*29*2.4
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    running the same rear wheel, and same cranks? Yes as mentioned same spindle length, although you will need a 73mm BB, not 68 as you had previously.

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