Tires, Pro-Trax on-road (medium compound with contoured inserts) (mounted and glued to part #4872 wheels) (2 left, 2 right) Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings.