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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 06-03-10, 09:43 AM   #1
dr_watson
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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.
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Old 06-03-10, 09:51 AM   #2
powers2b
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Did you replace the crank?

Enjoy
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Old 06-03-10, 09:58 AM   #3
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Thanks for replying. Yes crankset is replaced with a SS?FG crankset (1 chainring).
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Old 06-03-10, 10:26 AM   #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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