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08-29-10, 09:37 AM
I am doing my first fixie build and have run into something I just can not quite figure out myself. I have searched this forum with great luck so far, but now am coming up dry. Any ways I have a Motobecane Mirage that I am building. The bottom bracket was toast so I have been looking at ways to replace it. I have found the Phil Wood makes cups that should fit mine which I belive to be Swiss threaded. In a effort to save a bit of money I was thinking about a Shimano UN-72 bottom bracket cartridge. Found them for about 40 bucks vs Phil Woods that are 120. Where I am lost is what size do I get and how do you figure out the chain line? From what I have read it is effected by the cartridge, crankset and wheels? I plan on keeping my old wheels for now so how do I figure the rest out. Not sure on what crankset I want ether something under 70 would be nice. Thanks for any help