Small closely spaced knobs make this an XC go to tire and the ramped knobs keep you rolling Folding bead models feature a higher TPI dual compound casing and EPS puncture protection SC - Single compound, one compound throughout the tread optimized for longevity and performance Standard 26x2.1 559 Wire Bk/Blk 65 598 27 SC NoUPC/EAN/GTIN: 6933882513198