Maxxis Ardent TR EXO Tire An aggressive tread in high-volume casing, designed with great traction in mind. 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 Model Number