Tight enough tread spacing for high speed, drag-free onslaughts yet blocky and tall enough to really dig in when it comes time to slam on the brakes Tight enough tread spacing for high speed, drag-free onslaughts yet blocky and tall enough to really dig in when it comes time to slam on the brakes Tough: two full layers of casing for maximum sidewall protection, sealant ready 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