Online Horsepower Calculators

D-50394 said

If you change gear ratio it changes mph so that changes how much hp the calculators show you are making. So really it is all a guess.

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If your MPH goes up with a gear change, it means your gear was "possably" wrong to start with, but basically, it takes "X" amount of power to run "X" MPH at a certain weight. That's where the calculators are good