Bicycle Mechanics - Road/fixie conversion: What bb spindle length to use?

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Sincitycycler
04-29-07, 03:45 PM
I'm looking at some old steel Schwinn frames on ebay to make into a fixed gear.
How do you determine if you need a 68x103 or 68x108, etc. in the bottom bracket?

roadfix
04-29-07, 03:50 PM
Spindle length (103 vs 108) is mostly determined by the crankset.
tellyho
04-29-07, 05:11 PM
Choose a crankset, use its designated BB spindle length.

Sheldon Brown
04-29-07, 06:13 PM
Spindle length (103 vs 108) is mostly determined by the crankset.

Spindle length is EXCLUSIVELY determined by the crankset and the desired chainline.

See: http://sheldonbrown.com/bbsize

and: http://sheldonbrown.com/chainline

Sheldon "Numbers" Brown

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| Most things having to do with fixed-gear/SS are bone stupid, |
| and folks who usually work on modern bikes aren't used to |
| thinking at that caveman level. -- Aaron Meberg |
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