New Traction on Worn Tires! This lightweight handy tool cuts new edges into your dull worn out knobby tires. Refresh your front or rear tire before putting a new tire on. Extends the life of your tire and gives you new traction for every ride. Tread Doctor uses a specially designed heated carbide cutting blade to trim your knobby tire. It is easy to do yourself, just plug in and start cutting. With a little practice you can cut the minimal amount of rubber off each time to get a new edge. It’s like riding with a new tire every time! Get More Traction for Every ride!