A clean, tough, and simple rear axle designed for Trek mountain bikes. The axle tightens 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 models from model years 2022 and 2023, including Top Fuel, Fuel EX Gen 5 and Gen 6, Slash, Fuel Exe, and Rail Gen 2, Gen 3, and Gen 4.