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       MPH vs RPM for Various Gear Ratios

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Model:

1958 Up Cast Iron Eagle

Springer Eagle

Silver Eagle

RPM MPH MPH MPH MPH MPH MPH MPH MPH MPH MPH
Pri. Ratio 1-1.2 1-1.2 1-1.2 1-1.2 1-1.56 1-1.56 1-1.56 1-1.36 1-1.36 1-1.36
Sec.Ratio 18-65 19-65 20-65 21-65 21-60 22-60 23-60 18-60 19-60 21-60
Total Ratio 4.333 4.105 3.9 3.714 4.457 4.25 4.069 4.533 4.295 3.885
1600 18.6 19.6 20.6 21.6 18 19.8 19.7 17.7 18.7 20.7
1800 20.9 22.0 23.2 24.3 20.3 21.3 22.2 19.9 21.0 23.3
2000 23.2 24.5 25.7 27.0 22.5 23.6 24.7 22.2 23.4 25.8
2200 25.5 26.9 28.3 29.7 24.8 26.0 27.1 24.4 25.7 28.4
2400 27.8 29.4 30.9 32.4 27.0 28.4 29.6 26.6 28.1 31.0
2600 30.1 31.8 33.5 35.1 29.3 30.7 32.1 28.8 30.4 33.6
2800 32.5 34.2 36.0 37.9 31.5 33.1 34.6 31.0 32.7 36.2
3000 34.8 36.7 38.6 40.6 33.8 35.4 37.0 33.2 35.1 38.8
3200 35.9 39.1 41.2 43.3 36.0 37.8 39.5 35.4 37.4 41.4
3400 38.3 41.6 43.8 46.0 38.3 40.2 42.0 37.7 39.7 43.9
3600 40.6 44.0 46.3 48.7 40.6 42.5 44.4 39.9 42.1 46.5
3800 42.9 46.5 48.9 51.4 42.8 44.9 46.9 42.1 44.4 49.1
4000 45.2 48.9 51.5 54.1 45.1 47.3 49.4 44.3 46.8 51.7
4200 47.5 51.4 54.1 56.8 47.3 49.6 51.8 46.5 49.1 54.3
4400 49.9 53.8 56.6 59.5 49.6 52.0 54.3 48.7 51.4 56.9
4600 52.2 56.3 59.2 62.2 51.8 54.3 56.8 51.0 53.8 59.4
4800 54.5 58.7 61.8 64.9 54.1 56.7 59.2 53.2 56.1 62.0
5000 56.8 61.2 64.4 67.6 56.3 59.1 61.7 55.4 58.5 64.6
5200 59.1 63.6 66.9 70.3 58.6 61.4 64.2 57.6 60.8 67.2
5400 62.6 66.0 69.5 73.0 60.8 63.8 66.6 59.8 63.1 69.8

Standard secondary ratio in bold

  Copyright (C) 1998 Jim Frederick     May be reproduced with credit                 

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