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Deleted Member 4613
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Here's how I do the calculation: (for 26 inch wheel):
Top Speed = top rpm/ gearbox ratio x wheel sprocket/drive sprocket x wheel circumference x 60, all divided by 5280
Four stroke: Using a 44 tooth rear sprocket, a 9 tooth drive sprocket, and 4/1 gearbox:
7500 rpm x 7feet x 60, all divided by 5280 = 30.5 mph
4 x 44/9
Using a 48 tooth sprocket:
7500 rpm x 7 ft. x 60, divided by 5,280 = 27.9 mph
4 x 48/9
Two stroke, assuming a 4.1/1 gearbox:
Using a 44 tooth sprocket, 10 tooth drive sprocket, and top rpm of 9000 rpm:
9000 x 7 x 60, divided by 5280 = 39.68 mph
4.1 x 44/10
Using a 36 tooth rear sprocket:
9000 x 7 x 60, divided by 5280 = 48.5 mph
4.1 x 36/10
Top Speed = top rpm/ gearbox ratio x wheel sprocket/drive sprocket x wheel circumference x 60, all divided by 5280
Four stroke: Using a 44 tooth rear sprocket, a 9 tooth drive sprocket, and 4/1 gearbox:
7500 rpm x 7feet x 60, all divided by 5280 = 30.5 mph
4 x 44/9
Using a 48 tooth sprocket:
7500 rpm x 7 ft. x 60, divided by 5,280 = 27.9 mph
4 x 48/9
Two stroke, assuming a 4.1/1 gearbox:
Using a 44 tooth sprocket, 10 tooth drive sprocket, and top rpm of 9000 rpm:
9000 x 7 x 60, divided by 5280 = 39.68 mph
4.1 x 44/10
Using a 36 tooth rear sprocket:
9000 x 7 x 60, divided by 5280 = 48.5 mph
4.1 x 36/10
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