Morison's power speed calculator is like having a dyno in your back pocket! Using information such as tire size, gear ratios, Horsepower and displacement, this handy slide tool works out the relationship between: elapsed times, Miles Per Hour and power to weight ratios, tire diameter to speed and gear ratio, engine displacement to compression ratio, Horsepower measured at flywheel, Horsepower ratings are calculated for rear wheel Horsepower. .
