The knurled center tread transitions to a file tread along the edges for confidence in the corners The knurled center tread transitions to a file tread along the edges for confidence in the corners Light, fast-rolling, high volume slick for gravel or do-it-all road bike DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners EXO - sidewall protection which helps prevent puncture from sidewall abrasions TR - Tubeless Ready - sealant required