We took the tread design of the fast trak a step further by manipulating each knob with fe analysis paired with extensive rider feedback and design experience the result is a tyre with less rolling resistance and more traction all in a lightweight package adaptive tread technology for competitive xc riders casing 60 tpi for 15 improved cut resistance over s works model bead foldable butyl wrapped bead 2bliss ready compound 60a 650b x 20 psi 35 65