Lightweight Ultra High-Performance tire for road race, time trial and triathlon competition. Dynamic:GSR – Improved Grip, Reduced Rolling Resistance and Longer Wear R:Shield – Improved puncture protection under the tread while maintaining overall performance Optimised Tread Cap – Reduced thickness and speed focussed tread pattern for ultimate performance Class leading lightweight design – Lower rotating weight allowing for quicker acceleration, low rolling resistance and supple ride. For use with inner tubes only