The center tread, while ideal for braking and accelerating traction, also features ramped knobs to minimize rolling resistance 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 29x2.25 622 TBLS - Fold Bk/Blk 60 755 60 DC/EXO/TR NoUPC/EAN/GTIN: 4717784026589