You don’t need to spend a lot of money to add gearing options to your pit box. The gear ratio is 5:1 (five to one), and that means that the pinion must make five revolutions to turn the spur gear one revolution. ![]() ![]() We need to go one step further, however, and divide the number of teeth on the spur gear (100) by the number of teeth on the pinion (20). 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.Īny two gears will have a “ratio” if your car has a 20-tooth (20T) pinion and a 100-tooth (100T) spur gear, that’s a 20:100 ratio. Understanding your vehicle’s gear ratio is a powerful tool when making changes at the track or around the backyard. No matter what you install in your RC car or truck, when it comes to speed and run time it’s all about gearing. ![]() How to: The driving force behind your RC vehicle
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