The DHF incorporates ramped knobs for low rolling resistance and channel-cut knobs to increase gripping edges, giving straight-line control and precise cornering DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners EXO equipped models feature Maxxis` EXO sidewall protection which help prevent puncture from sidewall abrasions TR - Tubeless Ready - sealant required Tubeless 27.5x2.3 622 TBLS - Fold Bk/Blk 65 1075 60 DC/EXO/TR NoUPC/EAN/GTIN: 4717784029191