Pirelli Scorpion MX Extra X Rear Tire (100/100-18) Optimal choice for professional training and amateur to semi-pro racers who ride all types of terrain and demand performance lap after lap especially under "race simulation."Grip and traction on a wide range of terrain (from mid soft to mid hard).Perfect Surface area and compound's carbon black structure for balance between stiffness, reliability and lasting performance.Note: All NHS (Not for Highway Service) motorcycle tires are only for pure racing and cannot be used on public roads. Therefore, there is no official homologation.