A clean, tough, and simple rear axle designed for Trek mountain bikes. The axle is tightened with a 6mm Allen key and features an additional 6mm Allen key integrated on the drive side, providing a backup option if the non-drive side becomes rounded. Constructed from 7075 aluminum and manufactured to Trek's exact specifications, this axle is compatible with multiple Trek model years and generations including MY22/23 Top Fuel, Fuel EX Gen 5 and Gen 6, Slash, Fuel Exe, and Rail Gen 2, Gen 3, and Gen 4.