Tire bead construction is stiff and sized for ideal fitment and tire retention on Zipp 303 Firecrest rims Proprietary blended compound for ultra low rolling resistance and grip Ultra lightweight casing for low rolling resistance Under tread breaker belt for added puncture protection Proprietary Tubeless Ready clincher tire design with additional air retention properties Bead construction and geometry ensure safe retention on Zipp rims Short-Ply construction and 120 TPI casing