Hard-pack XC race tire, smaller tightly spaced knobs, Dual Tread Compound.DTC - Dual Tread Compound is a combination of two different rubber compounds, L3R Pro (center knobs) and Stick-E rubber (corner knobs)Standard26x2.35559WireBk/Bsk60822120DTCNoUPC/EAN/GTIN: 047853890969