Fit For Surron Light Bee Dirt Bike 420 Sprocket Set Sprocket helps reduce friction when the chain turns on the sprocket teeth. It will helps prevent premature chain wear and prolongs its lifespan. Easy to install and remove,the sprocket gear design kit is simple, light and small, easy to carry and use, convenient and practical. Easy to install, it is a good choice to replace old and broken ones and make the equipment work longer after replacement. Sprocket is easy and quick to install, without complicated tools, and easy to use.