Originally Posted by
ijgoodwin
Very helpful! Much easier than going through and trying to recalculate a bunch of columns.
I also am thinking more clearly since waking up, and reduced it down to one magic number:
=B2*C2*0.832694550466497
If you have a 700x23c on the rear, that will cover it for you with a circumference of 2096. If your circ is different, scale the magic number the appropriate % to account for the difference from 2096 (1% smaller circumference = 1% smaller magic number).