Originally Posted by
ryanisjones
the 4 teeth extra on the chainset is equivalent to less than an extra half wheel spin for one full pedal rotation in the highest gear (11T cog) and likely less than a quarter more wheel spin in the gear I was kicking both bikes off from. With that said I will test this again tonight and use way more accurate gearing.
Count the teeth. Since you seem to like the acceleration of some particular gear of the trek, count the teeth used, and then count teeth on the BMC and choose a gearing that has as close as possible a front/rear tooth quotient. Maybe you can even find an exact match, like 50/20=2.5 seems to be an available gearing on the BMC (your chainrings are 'compact' 50-34, and it looks like your cassette offers
11-12-13-14-16-18-20-22-25-28-32), maybe the Trek has like 40/16=2.5 or something. If you can't find a suitable exact equal, round up to the slightly larger on the BMC, because the Trek has larger tires, thus a
slightly larger wheel diameter and full-revolution rollout distance.