The Pro-Line BFGoodrich Krawler T/A KM3 Mud-Terrain Class 1 1.9" Rock Crawler Tire was designed from the ground up for maximum grip on the toughest terrain. Measuring in at 4.19" outer diameter, the Class 1 legal KM3 is ready for both competition and scale adventure. The Mud-Terrain T/A KM3 (Key feature: Mud traction 3rd Generation) is BFGoodrich's Off-Road Maximum Traction tire with aggressive tread lugs that bite into loose or muddy surfaces and climb over slippery rocks. Based on the BFGoodrich Krawler T/A KX symmetric tread design, the Mud-Terrain T/A KM3 features deep, self-cleaning independent tread blocks and linear transverse flex zones to provide the grip that you need to get over the toughest obstacles. This tire provides the perfect balance of scale looks and performance!