I think what Brian is saying is not that the math is incorrect but that reach on its own does not say much and that it should always be considered together with stack.
Reach and stack together determine the distance between bottom bracket and top head tube or, in a more practical sense, how much space there is for you body in standing position between pedals and bar. The different ride-9 settings only change the angles but not this distance.
Nov. 30, 2020, 8:11 a.m. - Niels
I think what Brian is saying is not that the math is incorrect but that reach on its own does not say much and that it should always be considered together with stack. Reach and stack together determine the distance between bottom bracket and top head tube or, in a more practical sense, how much space there is for you body in standing position between pedals and bar. The different ride-9 settings only change the angles but not this distance.