Introducing Sportmax GPR-300 - The Sportmax® GPR-300 is a radial tire that offers well-balanced sport performance for a variety of sport bikes. Value: Designed to offer a balance of performance and value. Handling: Because bikes are meant to lean over. Radial tire technology helps to provide enhanced grip in wet and dry conditions. Optimized construction to enhance handling and responsiveness for street-going sport riding. Aggressive sport-derived tread pattern for enhanced on-bike appearance. Tire Specifications: Load / speed index: (58W). Recommended rim (inches): 3.50. Overall diameter (inches): 23.70. Overall width (inches): 4.80. Full tread depth (inches): 5/32. Maximum load (pounds) / PSI: 520 @ 42 PSI. Construction: Radial.