P

Speed (MPH) =

*a*X

*(b/c)*X

*(d/e)*X

*(f x g)*X 60 / 12 / 5280

X = times (multiply)

/ = Divide by...

the paranthesis aren't completely necessary, but help add organization to the problem for those of you who remember enough of Algebra to know what they mean. They mean that you do the process inside the paranthesis first. so let's say a X (b/c) ..... you'd divide b by c, then multiply by a ...... know what i mean?

*a*= RPM of engine

*b*= #teeth of first gear in gearbox where clutch is (smaller gear)

*c*= #teeth of second gear in gearbox (larger gear)

I beleive the smaller gear is 20 teeth and the larger gear is 83 teeth

*d*= #teeth of chain sprocket on engine (usually 9 or 10 teeth)

*e*= #teeth of chain sprocket on wheel

*f*= diameter of wheel

*g*= 3.14 which is equivelant to pi (to get circumference of wheel)

60 is for min. in an hour, 12 is for inches in a foot, 5280 is feet in a mile. Hope this works for you.

-pianoman