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. Advanced belt design and Jointless Band (JLB) rear tire construction utilizes a continuously wound belt for smooth performance and a consistent tire contact patch. Aggressive sport-derived tread pattern for enhanced on-bike appearance. Tire Specifications: Load / speed index: 66H. Sidewall: Blackwall. Recommended rim size (inches): 4.00. Overall diameter (inches): 24.3.