Ultra high performance road race tire with smooth tread and directional siping on the shoulders Ultra high performance road race tire with smooth tread and directional siping on the shoulders Class leading lightweight design - Lower rotating weight allowing for quicker acceleration, low rolling resistance and supple ride RSH - Improved puncture protection under the tread while maintaining overall performance GSR - Improved grip, reduced rolling resistance and longer wear DIT - Dual Integrated Tread Zones, keeps the driving and braking forces aligned properly as cornering forces come into play