High-volume casing and fast-rolling tread design provide exemplary performance in most riding conditions High-volume casing and fast-rolling tread design provide exemplary performance in most riding conditions SPEED - Triple compound composition where the two compounds in the outer layer are specially formulated to reduce rolling resistance and optimize tread wear and traction DD - Double Down construction features two full 120 TPI casing layers reinforced with a butyl insert TR - Tubeless Ready - sealant required