Originally Posted by
calamarichris
Anyone have any direct empirical evidence of chainline problems with this set up?
I was worried about the chainline (err beltline) for my Gate belt drive commuter, and bought two different width spacers, but it lined up perfectly without spacers.
A track chainline is 42mm from the center of the bike. Road doubles have the inner ring further inside than that, and the outer ring further outside. I forget the numbers but they're probably not hard to come by in Shimano's technical documentation.