Ratio Calc

What time is it? Its 40 tooth pinion over 84 tooth spur in the afternoon. The popular Ratio Calc! iOS app has just been updated to version 6.0. It continues to offer an easy to use ratio and rollout calculator for R/C racers which now extends it’s functionality onto the newly released Apple Watch. This latest version also includes a handy transponder store so you can quickly retrieve your PT numbers when booking in.

Download Ratio Calc! Here!