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Rpm.
Someone asked the question; how can I tell how fast the motor is turning at 60 mph. Here is the answer. Divide 336 x mph x gear ratio by wheel diameter in inches. Not rim diameter, wheel diameter. Assuming the rear tire is very close to the 4.10X18 non-tubeless tire, it might work out like this: 4.10 x .92 (the aspect ratio) is 3.772. That, plus the 18 inch rim is 21.772. Oopsie, we forgot the part of the tire under the fender, so, 25.544. Now to the gear ratio. The book says the primary ratio is 3.33. So all we need now is the final drive ratio. 16X40 is what the original guy was asking about, soooo, 40 divided by 16 = 2.5 X 3.33 = 8.325. Now, if I did this all right, 336 X 60 X 8.325 = 167832. And divided by wheel diameter, we get 6597.17 rpm at 60. Of course there has to be a fly in the ointment, and it is the Asian fascination with all indirect drive transmissions. 5th gear output is 0.9545, so multiply the 6597.17 rpm by 0.9545 and we get 6297 crankshaft rpm....Phew...ARH
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