FYI - I know this info has been shared before but I'm not sure with the Max MPH at rev limit. You can also use what ever RPM for a given rear and gear.
Little Math
MPH (miles per hour) = ((tire circumference in inches) x (RPM) x 60) / ((Final Ratio ) x 63360)
Many tire web site have tire circumference calculator for any given tire size.
The Federal tire size of 205/60R13 shows a circumference of 71.2"
Example: To find MPH at 8,000 RPM in 4th gear with a 4.1 rear:
MPH = (71.2 x 8,000 x 60) / (9.26 x 63360) = 34,176,000 / 586,713.6 = 58.25 MPH
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2.5 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 12.5 56.6
2nd 8.75 80.9
3rd 6.87 103.0
4th 5.65 125.3
5th 4.88 145.1
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2.93 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 14.65 48.3
2nd 10.26 69.0
3rd 8.06 87.9
4th 6.62 106.9
5th 5.72 123.8
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3.3 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 16.50 42.9
2nd 11.55 61.3
3rd 9.07 78.0
4th 7.46 95.0
5th 6.44 109.9
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3.33 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 16.65 42.5
2nd 11.66 60.7
3rd 9.16 77.3
4th 7.52 94.1
5th 6.50 109.0
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3.42 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 17.10 41.4
2nd 11.97 59.1
3rd 9.40 75.3
4th 7.73 91.6
5th 6.67 106.1
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3.58 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 17.90 39.6
2nd 12.53 56.5
3rd 9.84 71.9
4th 8.09 87.5
5th 6.99 101.3
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3.73 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 18.65 38.0
2nd 13.06 54.2
3rd 10.25 69.0
4th 8.43 84.0
5th 7.28 97.3
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3.90 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 19.50 36.3
2nd 13.65 51.9
3rd 10.72 66.0
4th 8.81 80.3
5th 7.61 93.0
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4.1 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 20.0 34.5
2nd 14.35 49.3
3rd 11.27 62.8
4th 9.26 76.40
5th 8.00 88.50
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4.3 Rear Gear
Max speed @ Rev Limiter 10,500 RPM
Gear Final Ratio MPH (@10,500 RPM)
1st 21.50 32.9
2nd 15.05 47.0
3rd 11..82 59.9
4th 9.71 72.9
5th 8.39 84.4
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Thanks, Trent
