IRC Rx-01 Motorcycle Tires IRC Rx-01 Tires have narrow grooves that create a flexible tread surface for a superior road-holding performance. Features: Stronger casing construction for better stability Tube type tire S-rated for speeds up to 112 mph Bias sport bike tire Tube type (Tt) Blackwall Notes : It is recommended to change your valve stem, tube and/or rim strip when installing a new tire. Shop Here! Need your tire mounted Weve got you covered! Tire Mount Discount