The Pirelli P Zero Race TLR 4S is Pirelli's first all season racing tyre that's got their tubeless technology. It provides excellent grip in all types of conditions and offers increased puncture protection while still giving those race characteristic's that the P Zero Race tyre is famous for.SpeedCore is a new patent-pending technology used in the construction of P Zero Race models with tubeless technology, the choice of the World Tour Factory Teams.  SpeedCore is a cutting edge TLR casing technology with an inner layer of aramid compound plus an aramid breaker providing fast yet very comfortable riding.SmartNET Silica compound is the latest generation blend of smart polymers to provide maximum grip with a low rolling resistance allowing for maximum speed and control. 4 Season handling performance and enhanced grip in wet conditionsHookless compatibility - Sizes 26-622 and below are not compatible with hookless rims - Sizes 28-622 and above are compatible with hookless rims subject