Wide knobs down the middle provide control under braking and L-shaped side knobs assure support when carving loose turns Wide knobs down the middle provide control under braking and L-shaped side knobs assure support when carving loose turns 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 EXO - sidewall protection which helps prevent puncture from sidewall abrasions TR - Tubeless Ready - sealant required