Easy-RC.com's Gear Ratios tool allows you to calculate your R/C vehicle's gear ratio quickly and easily.
Your gear ratio is important because it describes the relationship between your vehicle's motor and its wheels. By fine-tuning your gear ratio you can achieve significant performance improvements.
For instance, if you find that your car is running out too soon, you can enter different gear numbers into the Gear Ratios tool and if it comes up with a higher gear ratio then you know that your car will run for longer if you use those gears. Similarly, if your car has a lot of battery life left after you have finished a race, you can try different combinations of gears until you come up with a lower gear ratio, which will make you car go faster.