Densely packed small knobs provide good bite, low rolling resistance, and responsive acceleration Perfect for hard packed cross country riding DTC - Dual Tread Compound is a combination of two different rubber compounds, L3R Pro (center knobs) and Stick-E rubber (corner knobs) Standard 20x1-1/8 451 Wire Bk/Bsk 100 60 60a/50a DTC NoUPC/EAN/GTIN: 047853626735