Specialized Roadsport Tyre The Roadsport tyre has been updated but still features one of Specialized's classic, most versatile tread patterns paired with the bead to bead protection of their premium Endurant casing. This upgrade gives the tyre increased speed, grip and durability, all in a lighter weight package. The rubber has also been updated to a new, extra-grippy compound that provides safe and predictable handling in a variety of conditions. Features Casing: 60 TPI Bead: Wire Compound: 60a Flat Protection: Endurant 700x26mm, psi 100-125, approximate weight 360g 700x28mm, psi 85-95, approximate weight 420g 700x32mm, psi 85-95, approximate weight 460g 700x35mm, psi 50-80, approximate weight 490g