GPS Gravity457 tire by Goldspeed Products is designed for racers and the harsh conditions of the GNCC series. This GPS Gravity457 rear 20x11x9 tire performs excellent in all types of terrain and conditions ranging from muddy, rocky, sandy to hardpack – making it the perfect tire for anyone looking for a good, aggressive, durable 20x11x9 tire. The GPS Gravity457 features a durable Heavy duty 4-Ply construction using premium rubber and nylon, it’s reinforced sidewall and design gives added protection and traction that is unmatched. The Gravity457 rear tire is a perfect match with the Gravity 448 front tire. (2) Free valve stems.