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help. bb sizing for an old 78' trek?(2 posts)

help. bb sizing for an old 78' trek?big andy
Nov 5, 2003 7:07 AM
Hi everyone. I need some help. I just bought an old 1978 Trek frame to build into my fixed commuter. The rear spacing is 120, so I'm just going to buy a track wheel. I have a pair of late 80's 600 cranks, which I'm going to use, the inside ring is 42. So can anyone help what size (width) bottom bracket I should get to have a good chainline (it's English threading). Should I get 110, 113 or 107? Thanks everybody. andy
re: help. bb sizing for an old 78' trek?Trevo
Nov 5, 2003 7:19 AM
I have a 83' 720 Trek. With a dished wheel, Iam using a 113mm mtn bike BB, and the chainline is good. I do know that unless you grind off the inside chainring ridge on the cranks you wont get much smaller bb on there cause of clerance issues.

Good luck.