Named after WTB Athlete Nathan Riddle, the Riddler hungers for speed yet hangs on in the corners, remaining composed and unflappable, just like Nathan RiddleÌ_Ì_s riding style Named after WTB Athlete Nathan Riddle, the Riddler hungers for speed yet hangs on in the corners, remaining composed and unflappable, just like Nathan RiddleÌ_Ì_s riding style Large, supported toothy side knobs and densely packed, low center tread Tough - A double layer of light casing, TCS Tough tires are composed of two full layers of casing, bead-to-bead, leaving no area unprotected on our burliest tires 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 TCS - WTB`s Tubeless Compatible System, sealant based tubeless system with improved bead shape