This is not a question. Im bored and Id figure id share this equation with all of you. I came up with it, so I have no source to back it up. Just seems like simple math and seems to be accurate.
This equation assumes your motor will be hitting the exact same top rpm as you previously were. If your gearing for a higher top speed, this equation assumes your motor has enough torque to deal with the new gears.
Actually, its 2 equations. For the first one, you will need to know how many teeth on your front and rear sprockets, and you will need to know your current top speed.
This equation is for people who dont want to do calculations where you have to know the gear ratio of your transmission and wheels, and engine rpm.
S = current top speed
F = current front sprocket tooth count
R = current rear sprocket tooth count
X is used in equation 2
X = S / ( F / R )
F = new front tooth count
R = new rear tooth count
X = whatever you got from equation 1
S = new top speed
S = ( F / R ) * X
I have a Moby with stock 11 / 54 gearing, and was averaging 40mph top cruising speed. I ordered a 13 tooth front gear, and using this equation, have calculated a 47mph top cruising speed. Once my Moby is together, we will see how well this equation works.
Or, if anyone else wants to test the equation, and share the results, that would be great too.