A smooth fast rolling centerline transitions into small diamond shaped peaks and then more substantial shoulder knobs for traction under load. 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. TCS - WTB`s Tubeless Compatible System sealant based tubeless system with improved bead shape . DNA2 - Dual DNA is the perfect mix of efficiency traction and durability – firm centerline with softer shoulders and sides