The Tri-bite knobs have been resized and moved to maximize efficiency for those who love to climb, descend, and race through tight single track on a variety of terrain. DTC - Dual Tread Compound is a combination of two different rubber compounds, L3R Pro (center knobs) and Stick-E rubber (corner knobs) Standard 27.5x2.2 584 Wire Bk/Bsk 50 699 60 60a/50a DTC No