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  1. #1
    Junior Member
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    Bottom Bracket Question (Conversion Noobie)

    Hi,

    Please help the newbie here. I am converting my GF's old trek bike to fixed gear/SS. It has 130mm spacing in the rear and I installed a flip-flop wheel that is 120mm. I am now working on the chainline and I feel like I need new bottom bracket that is shorter to push the crank/chainline towards the center of the frame. The bike originally had 3 chainrings and no idea and what size is the current bottom bracket. I can see that the chainring is pushed far away from the frame.

    Cranks have been replaced with a crank for SS/FG. 1 chainring only.

    Could somebody please tell me what bottom bracket I should install to have a correct chainline with the flip flop wheel? Is it 68x103, 68x107? Any help is appreciated.



    Thanks.
    Last edited by dr_watson; 06-03-10 at 09:57 AM.

  2. #2
    Listen to me powers2b's Avatar
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    Did you replace the crank?

    Enjoy
    Quote Originally Posted by SBFixed View Post
    You're a dick, if your bike gets stolen I hope that you don't get a thread.

  3. #3
    Junior Member
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    Thanks for replying. Yes crankset is replaced with a SS?FG crankset (1 chainring).

  4. #4
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    1) measure the chainline.
    2) check with Crankset supplier, they will give your the Chainline and B.B length

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