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Try our gear ratio and rollout calculator to find the right pinion and spur for your car, whether it's Team Associated, Tamiya, Traxxas, or any other make. 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.
Changing the gear ratio is an easy way to alter the performance of your RC car. You can gear for a higher top speed at the expense of slower acceleration, or vice versa. You can alter your car’s gear ratio by using a different pinion or spur gear.
Calculate your ratio, your final drive ratio (FDR), and rollout, and see exactly how much of a difference a gear change will make.
Use the following calculator to determine the gear ratio of your radio control vehicle. The gear ratio calculator uses 2 combinations of gears to output an overall drive ratio. The first set is the main gear set which is generally starting at the motor or nitro engine.
Pinion: Enter the FDR you looking for ==> Please enter Spur, Pinion and Internal gear ratio.
Using standard-sized tires to calculate your FDR, first divide your vehicle's spur gear by the pinion gear, then multiply that result by the internal drive ratio of the car. The internal drive ratio can be found in the documentation that comes with your vehicle.
Understanding your vehicle’s gear ratio is a powerful tool when making changes at the track or around the backyard. Whether you’re aiming for longer run times or to set a land speed record against your friends, knowing what to change and busting out some simple math makes it easy to see how gearing works.
