Driven # of Teeth / Driving # of Teeth = Gear Ratio
Divide the number of teeth on the driven gear (the ring gear) by the number of teeth on the driving gear. For a 4.40/1 ratio, the driven gear will turn 1 revolution for every 4.40 revolutions of the driving gear.
Divide the number of teeth on the driven gear (the ring gear) by the number of teeth on the driving gear. For a 4.40/1 ratio, the driven gear will turn 1 revolution for every 4.40 revolutions of the driving gear.