The All-New GPS Gravity 55 tire by Goldspeed Products is designed for racers and the harsh conditions of the GNCC series. This GPS Gravity 55 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 Gravity 55 features a durable 6-Ply construction using premium rubber and nylon, it’s reinforced sidewall and design gives added protection and traction that is unmatched. The Gravity 55 rear tire is a perfect match with the Gravity 48 front tire. (2) Free valve stems.