Gear Ratio Calculator
Use our RC gear ratio and rollout calculator to find the right pinion and spur for your car. Enter your car's internal drive ratio to see the final drive ratio (FDR), and see the percentage change in gearing you'll get from a new pinion and spur.
Class Crawler/Scale Drag Racing Drifting Monster Truck Offroad Onroad Oval
Scale/Size 1/4 1/5 1/6 1/8 1/10 1/12 1/14 1/16 1/18
Power Electric Gas Nitro
Products Battery Car Motor Tire