Originally Posted by kudude

as long as you're pedaling

speed / cadence * scaling factor = gear inches

you can figure it out if you feel like it, use sheldon's calculator or whatever


edit, fine, I'll do it since I can't set something like this up and not finish it

[speed (mph) * .213] / [cadence/60] * 27 = 345*speed/cadence = gear inches for a 700c road bike