Traxxas 8273 assembled wheels and tires include 1.9" Canyon Trail tires pre-glued on black Tactical wheels. Designed for TRX-4 Scale and Trail Crawler chassis. Fits front or rear and sold as a pair. Uses 12mm hex. 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.