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Math...check...exactly. <img src="/forums/images/graemlins/smile.gif" alt="" />

30 x PI (3.1416) = 94.248 (circumference in inches)

63360 (# inches per mile) / 94.248 = 672.7 tire revolutions per mile

672.7 x 4.625 (gear ratio) = 3109 engine revolutions per mile in 4th gear

Not knowing the amount of overdrive...just multiply the OD percentage by the non-OD number above.

K? <img src="/forums/images/graemlins/wink.gif" alt="" />


Russell, your calculation is at 60 mph. He was referencing 55 mph which in 4th gear is 2851 RPM and 5th gear 2440 RPM KM145 is 0.856 OD in 5th

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