Originally Posted by
wagnern
So in this case, should I get an 18t? At the same time, I don't want to be peddling like a mad man on hills...?
Well, 48x18 gives you 72 GI, so yes, that would be correct. As for spinning madly down hills, you just need to rely on a front brake to control the speed. I can easily maintain 30 mph downhill in that gear without having to ride the brake, and can spin out to about 35 mph at the bottom.