![]() ![]() top speed in first gear), you can combine the drive ratios together into a combined gearing ratio: Combined gearing ratio = primary drive ratio x gearbox ratio x final drive ratio It depends on the bike, but usually there’s something like a 10:1 or 20:1 gearing ratio in the first gears from the engine down to the wheel. Ground speed (km/h) = engine speed / primary drive ratio / gearbox ratio / final drive ratio x wheel circumference final drive), and then multiply it by the circumference of the wheel. primary drive + sometimes secondary drive, 2. I use the word “velocity” not to be fancy, but just to help distinguish between engine speed (revolutions per unit of time) with how fast the bike is going forwards.įirst, to work out final speed from engine speed, you calculate the gearing ratio of the above three things between the engine and the wheel (1. Wow, way to make it easy! You have to change rpm into revolutions per hour (just multiply it by 60), and work out the tyre circumference by combining the figures to get to a final unit either in miles or kilometres.īut here’s the math in a nutshell.
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