Significantly larger and stronger outer blocks with V-grooves for additional braking and cornering control. Great combination of speed and grip perfect for racing and trail riding. RCGD - RaceGuard - A synthesis of special india rubber and several layers of nylon fabric offers very effective protection against penetration punctures while minimizing penalties. DD - In addition to the RaceGuard protection belt there is an effective fabric protector on the sidewall as well for dual layer protection. ADX � Addix compound found on the Performance Line made to serve as an all-around well balanced compound for all uses. Tubeless ready easy 18% more cut resistant sidewall and easier to mount