Maxxis Aspen Mountain Tire 27.5"x2.25 Folding Tubeless Ready MaxxSpeed EXO 120TPI BlackPremier XC Race inspired low profile fast rolling center tread with staggered aggressive shoulder knobs. Maxxspeed compound offers improved rolling resistance and wet traction. MSPD MaxxSpeed is the latest version of Maxxis race compound that utilizes a silica filler to improve speed wet traction as well as further reducing rolling resistance by 25%. EXO equipped models feature Maxxis` EXO sidewall protection which helps prevent puncture from sidewall