Originally Posted by NoRacer

Using this calculator:

http://www.analyticcycling.com/GearS...ence_Page.html

I have a 54t chain ring on the front (yes, 54t) and on a flat ride, I'd be pushing the 11t on the back. If I maintain a cadence of 80 rpm, I'll be doing 31 mph on a windless day while in the drops.