i think it's something like 4.4:1

10T crank gear, and 44T clutch gear... (it's something close to that, but i forgot)

EDIT!: NVM! i got the ratio wrong... here's the complete ratios

http://motorbicycling.com/f48/i-calc...tml#post232881
looks like it's crank 22, clutch 80 so 3.6:1-ish