Pirelli Scorpion XC M Tire - 29 x 2.4 Tubeless Folding Classic Tan ProWall SmartGripPirelli Scorpion XC M Tire 29 x 2. 4 Tubeless Folding Classic Tan ProWall SmartGrip. The Scorpion XC M is the best choice for XC and Marathon courses where terrain can vary but speed is still the key factor. The medium profile tread pattern is ideal for riding quickly and confidently over a variety of terrains. SmartGRIP Compound: Long lasting grip in both wet & dry conditions with increased resistance to tearing Multi ply 120tpi Nylon for lightness &