Pirelli Scorpion Trail M Mountain Tire 29x2.60 Folding Tubeless Ready SmartGRIP ProWALL 60TPI BlackPirelli Scorpion Trail M Tire 29 x 2. 6 Tubeless Folding Black. The Scorpion Trail M is the best choice for trail riding where terrain can vary but speed is still the key factor. 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 60tpi Nylon for improved reliability and handing performance