PCBT Added biting edge and increased surface area for additional traction. Soft Works in soft terrain such as loamy soil, sandy or muddle conditions. Intermediate Works in a mix of packed and loose soil. Off-Road Provide grip and handling for off-road performance FEATURES Single radius profile to provide the ultimate control characteristics for when the track conditions deteriorate and become rougher to race. Advanced Apex on the Factory Spec provides a larger apex for improved responsiveness and increased support for higher speeds and harsher landings. Proprietary Ultra-High Molecular Mass compound features extended polymer chains that increases bonding points with the carbon molecules to deliver a rubber that is extremely strong allow the knobs to penetrate the ground more effectively.