Using not only rider feedback experience & knowledge weve taken tread design a step further by manipulating each knob of the Fast Trak with FE Analysis. The result is less rolling resistance more traction when you need it all in a lightweight package with bead to bead puncture protection. Adaptive Tread technology for Competitive XC riders.> Casing: 120 TPI > Bead: Foldable > Butyl wrapped bead = 2 Bliss Ready > Centre Compound: 60a / Shoulder Compound: 50a > Flat Protection: Armadillo Elite > 26" x 2.0; psi 35-65