IRC aspires to provide rides with high performance tires for any condition. Their mission is simple: To provide superior and never-ending product development and customer service. Their goal is to be your number one tire partner. IRC's hottest selling products for years. For general all around performance, handling, and mileage, nothing beats a pair of RS-310's. Original equipment on the Honda CB400SS. Sold individually. Tire Specifications: Load / speed index: 57H. Construction: Tubeless. Overall diameter (mm): 670. Tread width (mm): 105. Standard rim (inches): MT2.50.