Bridgestone Motorcycle Tires - Serving society with superior quality. Race-proven rear motocross tire designed for soft to intermediate terrain. Offers a race proven tread pattern designed with extra wide block spacing for great drive performance and improved slide control on firm base soil. Has tall tread blocks with shoulder steps and increased base angle radius for reliable stability and durability in a broad range of abusive soil conditions. Improved grip and traction matched with new available sizing adapts to the demands of today's four-stroke machines. Tire Specifications: Load rating: 49M. Speed rating: M. Overall diameter (inches): 21.7. Tread width (inches): 4.3. Tread depth (inches): 17/32. Approved rim size (inches): 1.60. Maximum load (pounds): 408. Maximum PSI: 32.