A smooth fast rolling centerline transitions into small diamond shaped peaks and then more substantial shoulder knobs for traction under load. TCS - WTB`s Tubeless Compatible System sealant based tubeless system with improved bead shape. Light - Lighter weight compound conforms to trail objects while still providing a happy balance between low rotational weight and reliability. FR - Fast Rolling with WTB`s Dual DNA rubber compound that optimizes efficiency traction and durability A firm long-wearing centerline tread with softer side knobs. SG2 - Defends all surfaces of a tire by providing an uninterrupted layer of puncture protection from bead to bead. DNA - Proprietary 60A durometer rubber compound offers the ideal mix of rolling efficiency and traction for Cross-Country and trail riding applications