Ratio Calc is a simple and fast tool designed for radio control car racers. It's perfect for use trackside, helping you easily calculate important ratios for your racing setup. Knowing your final drive ratio (FDR) can make a big difference when comparing your car with others. This helps you determine if your car is geared correctly for optimal performance.

With Ratio Calc, you can quickly filter by car manufacturer and model. This feature allows for easy car model selection, so you find the right setup for your specific vehicle. Just enter your pinion size and spur size, and the app displays the final drive ratio instantly. You can also enter the tyre diameter for rollout calculation, which is crucial for measuring how far your car will travel with each turn of the wheels.

Ratio Calc offers rollout reference charts that plot various pinion and spur combinations. These handy reference tables help you see the relationships between gear ratios and how they affect your car’s performance. Users can save their favourite cars for quick access, making it even easier to get the information you need when you're on the go.

The app allows for measurement units selection, giving you the option to choose between imperial and metric units, based on your preference. You can also select your preferred gear pitch, and Ratio Calc will show alternative ratios in other pitches, ensuring you have all the details you need for competitive racing.

Featuring a database of over 2000 cars and variants, Ratio Calc is regularly updated to include new models. This wide selection means you can find most radio control cars and their gearing easily. The favourites saving feature lets you keep personal settings on hand, ensuring that you can access your go-to setups without any hassle.

Whether you’re using the racer comparison tool to analyze your car against others or simply trying to find the best gearing for your vehicle, Ratio Calc is a reliable resource. The app supports your racing needs with a focus on vehicle performance optimization, making it an invaluable part of your RC racing tools.

In summary, Ratio Calc provides essential features like gear combinations reference, FDR display, and rollout calculations, ensuring you have everything you need for trackside success. With this tool, staying geared correctly and making quick adjustments has never been easier.