Standard |
Notes Sprocket ratios other than the Brompton Standard ratio
Example & Explanation of STURMEY 3 Speed Gear Hub with/without Mountain Drive Option Chart |
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Go to ACTUAL DATA ENTRY CHART |
CALCULATIONS FOR THE BROMPTON 3 SPEED STURMEY HUB
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Notes Sprocket ratios other than the Brompton Standard ratio |
Selected Wheel Size |
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The "Actual" physical wheel diameter size |
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Selected Rear Sprocket |
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The number of teeth in the Rear sprocket (You will be allowed to vary this) |
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Selected Front Sprocket |
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The number of teeth in the Front Chain Ring (You will be allowed to vary this) |
Resulting Sprocket Ratio |
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The resulting sprocket ratio |
Resulting Direct Drive Wheel Size |
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Resulting WHEEL SIZE in Direct Drive |
REAR HUB GEAR SELECTION |
Resulting Wheel Size |
With Mountain Drive Engaged … |
1st gear |
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With Rear Hub 1st gear engaged |
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| 2nd gear |
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With Rear Hub 2nd gear engaged (direct drive) |
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| 3rd gear |
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With Rear Hub 3rd gear engaged |
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Without Mountain Drive Engaged …. |
1st gear |
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| 2nd gear |
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| 3rd gear |
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