Originally Posted by
Road Fan
I agree! But then the next question is, how do you select the chainline you should build the bike to have?
If it is a double road bike with rim brakes from 5 to 12 speed, your chainline center is 43.5mm. Every standard bike type has a chainline standard based on the BB width/type and the rear hub spacing. If you know the dimensions and type of frame (road, mtb, etc) you can look them up.
https://www.sheldonbrown.com/chainline.html