Low profile center blocks roll quickly across the trail while the siped transition knobs and shoulder blocks give purchase on almost every trail condition Dual Tread Compound casing with wire bead DTC - Dual Tread Compound is a combination of two different rubber compounds, L3R Pro (center knobs) and Stick-E rubber (corner knobs) Standard 27.5x2.8 584 Wire Bk/Bsk 50 1004 60 DTC NoUPC/EAN/GTIN: 047853622287