Maxxis Crossmark II EXO/TR Tire - 29in Legendary center ridge still flies on hardpack, and the updated tread pattern provides better braking and cornering over a wide range of trail conditions Open-side knob design for versatile cornering EXO equipped models feature Maxxis` EXO sidewall protection which help prevent puncture from sidewall abrasions TR - Tubeless Ready - sealant required Model Number