We took the tread design of the fast trak a step further by manipulating each knob with fe analysispaired 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 riderscasing 60 tpi for 15 improved cut resistance over s works modelbead foldablebutyl wrapped bead 2bliss readycompound 60a 27534 x 20 psi 35 65