Trying to calculate the engine rpm of a bike at a given speed. Constants I know are, primary drive ratio(2.184), 5th gear ratio(.857od), final drive ratio(17/39=2.294), tire diameter(25.5=790 revs per mile). So, would it be as simple as
2.184x.857= 1.8716x2.294=4.293x 790(tire rev at 60 mph)=3391rpms?