Maxxis Torch Tire Max Torch 29x2.1 Bk Fold/120 Sw Smooth, round profile with tightly spaced block tread and heavy siping provides a stable platform when on dirt or pavement Lightweight construction with a supple 120 TPI casing Maxxis Torch 29x2.1 Black Fold/120 SW Tires SC - Single compound casing for a durable, dependable tire SW - SilkWorm increases puncture and tear resistance with a reinforced breaker beneath the tread surface