Tire - Racetec™ RR - Rear - 190/55ZR17 - (75W) Compounds, tread pattern, profile and structure are calibrated in a precise balance to provide consistent performance throughout the tire's life, Developed and raced by Guy Martin at the Isle of Man TT and Northwest 200, Racing grip all the time, whether riding on the track or street, Tire profiles give precision and high-speed stability, (W)-rated for speeds of 168+ mph