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How do you work out final gear ratio of motorcycle with 14 tooth crankshaft to 59 tooth gear box with 11 tooth front and 47 rear sprocket?
The 14 tooth crank gear mated to the gearbox 59 tooth gear gives a ratio of 4.21:1 which is found by 59/14. Front sprocket 11 & rear sprocket 47 gives a ratio of 4.27:1 ie 47/11. Overall ratio is found by multiplying the two ratios together 4.21*4.27=17.97:1 NOTE - The 14 & 59 tooth gears will be the primary gear reduction in a motorbike, this does not include the actual gearbox ratios which will need to be taken into account for the overall final ratio.
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