The updated Roadsport tire features one of our classic, most versatile tread patterns paired with the bead to bead protection of our premium Endurant casing. This upgrade gives the tire increased speed, grip and durability, all in a lighter weight package. We also updated the rubber with a new, extra-grippy compound that provides safe and predictable handling in a variety of conditions. So, it&&';;s no surprise that it has already become a Specialized employee favorite. Casing: 60 TPI Bead: Wire Compound: 60a Flat Protection: Endurant 26x1 3/8", psi 70-90, approximate weight 515g 27x1 1/4", psi 85-95, approximate weight 545g 700x24mm, psi 100-125, approximate weight 335g 700x26mm, psi 100-125, approximate weight 360g 700x28mm, psi 85-95, approximate weight 420g 700x32mm, psi 85-95, approximate weight 460g