The Rock Hawk from CST features an aggressive tread pattern with large, well-spaced lugs. This spacing allows the tire to shed mud and other debris on mountain bike trails with varying conditions.SC - Single compound, one compound throughout the tread optimized for longevity and performanceStandard26x2.4559WireBk/Bsk65106027SCNoUPC/EAN/GTIN: 6933882514539