The app calculates final drive ratio and rollout for radio control cars. Users can select cars by manufacturer and model, inputting pinion and spur gear sizes.
by David Mills★ 4.525 ratingsSports$2.99Data updated 2026-09-19
Calculates , RPM, final drive ratio, and rollout in inches and millimeters. Stores setups and notes. Allows emailing of data for record keeping. Input pinion and spur sizes for calculations.
Calculate car gear ratios using spur and pinion gear counts and secondary gear ratios. Input values to determine final drive ratio. Compare low and high gear settings for acceleration, speed, motor load, and battery life.
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The app calculates the Outside Diameter, Centre Distance, and Ratio of spur gears. It uses the gear systems and number of teeth for these calculations.
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