Elite level racing tire with smooth center tread and siped and micro-knurled shoulders for improved corner traction. Maxxis` all-purpose road race tire receives a refresh for 2021 with a new lighter weight casing upgraded puncture protection and a revised tread pattern for a lighter faster and more durable High Road. HYPR-S - Full silica compound with low rolling resistance and high traction without sacrificing durability. ZK - Next generation puncture protection material that is lighter more flexible and stronger than previous materials such as K2 � generally used as a breaker layer under the tread