The Aggressor is designed for high-speed modern mountain bike trails. Advanced knob shaping creates extra gripping edges, and reinforced side knobs offer enhanced stability when cornering at speed. An all-around trail tire excelling on everything from loose cross country race courses to heavy all-mountain riding. FEATURES: Tpi = Threads per inch. The number of threads that cross through one square inch of a single ply of the tire’s casing. Lower TPI gives better puncture, cut and abrasion resistance but is heavier. Higher TPI conforms better to the terrain, offering a smoother, more comfortable ride while reducing the weight of the tire. Tr = Tubeless ready. Sealant-compatible rubber is used with the familiar Maxxis dual-ply 60 TPI downhill construction and butyl insert for support and rim protection in order to offer the benefits of increased grip and reliability. Wt = Wide trail. Wide Trail construction optimizes the tire’s tread layout and profile on today’s modern, wider rims. WT tires are optimized for a 35mm inner rim width but are proven to work over a range from 30-35mm inner rim widths, depending on the rider’s preference. Exo = Protection. An extremely cut-resistant and abrasion-resistant material added to the sidewalls of select mountain tires. . Choose EXO Protection for exceptionally rocky, treacherous trails where the chance of sidewall cuts and abrasions is high. DD = Doubledown. DoubleDown is the next step in the evolution of the dual-ply tire casing for enduro racing. Two 120 TPI casing layers reinforced with a butyl insert provide the enduro racer with the support and protection of a downhill tire, but in a lighter package.