The CST Blackjack features a fast-rolling tread pattern with small, tightly spaced knobs for optimal rolling resistanceEvenly spaced knobs work well on medium and hardpack conditions SC - Single compound, one compound throughout the tread optimized for longevity and performanceStandard26x2.1559WireBk/Blk6567027SCNoUPC/EAN/GTIN: 6976416392630