Hey guys, I posted this in the Classic and Vintage forum and didn't get much response, maybe this would be a better place for this thread...

I'm building a 1972 Peugeot UO-8 into my first fixed gear. I've basically figured out what parts I need to R&R the French BB. Now I get to worry about chainline. Harriscyclery says the Sugino RD cranks they sell give a proper 42mm chainline when paired with a 103mm BB. But I don't see a spindle that short anywhere on their website. Does anyone know of a source for a spindle in that width?

I'm likely going to convert to the Sugino French thread BB cups (replace the originals). Is replacing the cups with a different brand going to alter the ideal spindle width in anyway? In my mind I don't see how the cups would alter the chainline of a BB, but I've been known to be wrong before (plenty of times)

and finally - 103mm seems like a very narrow BB. Am I going to run into clearance issues between the chainring and the chainstay? I plan on using a 42T chainring that currently is just sitting around my garage.

Mac

Not sure about the cups, but a 107 should be fine. If my understanding is correct, that means only an extra 2mm on each side of the bracket.

will 2mm not make that much of a difference? I see so many people obsessing about PERFECT chainline that I figured a few mm could make a big difference.

Mac

2mm is not a big difference at all. I wouldn't worry about it.