The Ardent features center knobs that are ramped to reduce rolling resistance, and the side knobs are angled and stepped to provide great biting traction in corners The Ardent features center knobs that are ramped to reduce rolling resistance, and the side knobs are angled and stepped to provide great biting traction in corners The Ardent Race tire from Maxxis is ideally suited for technical XC race courses and endurance-length events SPEED - Triple compound composition where the two compounds in the outer layer are specially formulated to reduce rolling resistance and optimize treadwear and traction EXO equipped models feature Maxxis` EXO sidewall protection which helps prevent puncture from sidewall abrasions TR - Tubeless Ready - sealant required