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RPM vs Speed

01/10/2007


I created an excel spreadsheet to determine what the tach should be at for a given speed and gear. 

You can change the gear ratios and even compare results for different sized tires.

Enjoy

Ian

RPM vs Speed Calculator
Instructions: Fill in gearing info, fill in tire width, profile, rim size for up to 3 tires, fill in speed in either MPH or KM/H.  The rpm in each gear is calculated for you.
Gearing Info
1st 2.771
2nd 1.543
3rd 1
4th 0.694
(5th)
(6th)
Final 3.77
Tire Info Tire 1 Tire 2 Tire 3
Width (mm) 225 225 225
Profile  50 55 60
Rim Size (in) 16 16 16
Tire Height (in) 24.86 25.74 26.63
Tire Circumference (in) 78.05 80.84 83.62
English Metric
Speed (mph) 144 Speed (km/h) 232
Tire 1 Tire 2 Tire 3 Tire 1 Tire 2 Tire 3
RPM in 1st 20352 19652 18998 RPM in 1st 20374 19673 19019
RPM in 2nd 11333 10943 10579 RPM in 2nd 11345 10955 10590
RPM in 3rd 7345 7092 6856 RPM in 3rd 7353 7100 6863
RPM in 4th 5097 4922 4758 RPM in 4th 5103 4927 4763
RPM in 5th 0 0 0 RPM in 5th 0 0 0
RPM in 6th 0 0 0 RPM in 6th 0 0 0
Results assume a locked torque convertor or a non-slipping clutch

 

 


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