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. Sport bias tire with well-balanced in abrasion resistance and grip. Combines narrow and wide grooves to provide a flexible tread surface for superior road holding and traction on wet roads. RX-01's stronger casing construction provides improved straight-line stability. Sold individually. Tire Specifications: Load / speed index: 66S. Construction: Tubeless. Overall diameter (mm): 626. Tread width (mm): 142. Standard rim (inches): MT4.00.