Originally Posted by
Strawbunyan
I have 29x2.5 tires and 175mm crank arms, when i tried the calculator it came pretty close to those numbers if i remember correctly.
Ah yes, I ran it with 170 arms. Your longer arms cancels some or all of the effect of the taller tires, versus my calculation. I know gear-inch numbers well, haven't used gain-ratios, but should, as gear-inches do not take crank length into account, but gain-ratios does.