Originally Posted by Retro Grouch
Couple of things.
1. So what's your crank length? If your base measurement is from the center of the bottom bracket spindle, differences in crank length are being ignored.
Exactly, the crank length determines the location of the pedals which is more relevant than the BB center.
BB center measurements are fine if all cranks came as 170mm (for example) and there is no devaition.