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  1. #1
    Senior Member
    Join Date
    Jan 2007
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    Fixed Gear Bottom Bracket Conversion

    I have a 1979 Schwinn Varsity that I converted to a fixed gear some time ago, and now I'd like to replace the one piece crank that came with it to a modern BB. I do however have a few questions, and would appreciate anybody who's done a similar project sharing their experience.


    1. What length Bottom Bracket should I use in order to keep my chainline the same?
    2. Do the BMX cranks such as the Bulletproof cranks accept standard pedals?
    3. I'm having trouble ordering from Harris Cyclery's internet site, and they're not answering the phone - where else can I find a set of short stack bolts for the chainring?

    Parts list under consideration:

    • Bottom Bracket Adapter FMF Adapter OR TruVative Adapter
    • Bulletproof Silver 110 BCD Cranks - Length = 165
    • Rocket Ring BMX Chainring - 40 Teeth (I have a 15 tooth sprocket)
    • Bottom Bracket - Shimano 105

  2. #2
    black betty DeadSailor's Avatar
    Join Date
    Mar 2007
    My Bikes
    custom flatlandbike, trek fuel ex8
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    1. if you mean the length of the spindle then, the chainline can be fixed with spacers that come with the cranksets. not dependingon the spindle
    2. 3 pc cranks and even 2 pc ill take 9/16 size pedals

    you dont need those adapters. if those are to use eruo bb in a american bb frame

    so just get an american bottom bracket

    that might not be what you need depeding on the crank arms. i would just get a crank set instead of buying everything individually

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