Staggered medium-height center knobs are ramped to reduce rolling resistance while fairly aggressive corner knobs provide excellent cornering grip The CST Patrol mountain bike tire features a versatile tread pattern suitable for a broad range of conditions SC - Single compound, one compound throughout the tread optimized for longevity and performance Standard 26x2.1 559 Wire Bk/Bsk 65 720 27 SC NoUPC/EAN/GTIN: 6933882514379