Maxxis Forza Dual Compound Tubular Skinwall 60TPI Bicycle Tire The casing provides the optimal mixture of performance and durability, and the dual compound tread ensures that the tire will last for many miles, yet still grip hard when needed most. DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners SW - SilkWorm increases puncture and tear resistance with a reinforced breaker beneath the tread surface Weight Model Number