A square profile provides a solid, consistent feel across the knobs. Modified knobs on the shoulder and center improve braking performance and traction on hard surfaces. A square profile provides a solid, consistent feel across the knobs. Modified knobs on the shoulder and center improve braking performance and traction on hard surfaces. EXO equipped models feature Maxxis` EXO sidewall protection which help prevent puncture from sidewall abrasions TR - Tubeless Ready - sealant required