Originally Posted by Platinum_Racing

Your tires also determine how you should gear your car. a tire that is 2.2 inches in diameter will travel further in one rotation than a tire that is 1.8 inches in diameter. There is a sweet spot for every track, every car, basically every situation. If you run wide open all the time, you can get away with faster gear ratios, but if your constantly accelerating, you should gear it lower, this will lower the motor temp, make your batteries last longer, and make your car perform better. If you swap tires to ones that are slightly larger, drop between 1 - 3 teeth on your pinion to compensate.