Ratio Calc! 7.1

Ratio Calc is a convenient tool tailored for radio control car enthusiasts, designed to facilitate on-the-spot use at the track. Understanding your final drive ratio (FDR) proves invaluable for comparative analysis amongst fellow racers in determining the optimal gear setting for your vehicle. In addition, users can conveniently access their preferred data directly from their Apple Watch.

• Effortlessly select your vehicle by filtering through manufacturer and model options
• Choose your pinion and spur sizes to instantly generate the corresponding FDR
• Input your tire diameter to calculate the rollout

The application offers detailed ratio and rollout charts, featuring visual representations of pinion and spur gear pairings to serve as practical reference materials.

• Store your frequently used vehicles for swift access
• Record notes and track details associated with your favorite cars
• Share ratio/rollout charts with ease
• Access additional vehicles directly through the app
• Customize measurement units (imperial/metric)
• Select your preferred gear pitch with alternative ratios displayed accordingly
• Extensive database containing over 1600 cars/variants