Bottom Bracket Question (Conversion Noobie)
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.
Last edited by dr_watson; 06-03-10 at 09:57 AM.
Listen to me
Did you replace the crank?
Originally Posted by SBFixed
Thanks for replying. Yes crankset is replaced with a SS?FG crankset (1 chainring).
1) measure the chainline.
2) check with Crankset supplier, they will give your the Chainline and B.B length