Looking for a quick gear calculation, so you don't have to download an app? 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.
Gears & Ratios
Enter your gearing to see the how your ratio will change.
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Get our free Gear Calculator App (links above), or try our Gear Recommender App!
Looking to calculate the top speed of your car? Try our RC Speed Calculator App!
Change Impact Chart
Click/tap the gears to see how new gears will affect your ratio:
Negative changes indicate a steeper ratio: higher top speed, but more strain on the motor/engine. Positive changes give more acceleration and put less strain on the motor/engine.
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