Mountain bikers, listen up - this derailleur hanger is one of those parts you don't think about until you need it, but having a spare could save your ride! Made from CNC-machined A6061-T6 aluminum alloy, this universal hanger is built to handle the abuse of trail riding. The reverse tooth pattern on the locking screw provides extra security so it stays put even through rough terrain and vibrations. Weighing only about 15g, it's lightweight without sacrificing strength, and the black finish looks clean on any bike. The 20mm installation hole diameter and 25mm outer washer diameter work with most frame designs, and the 8mm hexagon size is standard for easy installation. What's really great is the compatibility - it works with most electric bicycle frames and popular brands like TREK, KTM, Bianchi, CUBE, and many others. The 3D forging process creates higher density than typical CNC machining, giving you better strength and durability when you need it most. Having a spare hanger in your toolkit is smart because these are often the first thing to bend or break in a crash or tip-over. Instead of being stranded on the trail or waiting days for a replacement, you can swap this in and keep riding. The quality is solid, and for the price, it's cheap insurance against ruined riding days. Whether you're a casual rider or hitting serious trails, this is one of those small parts that's worth having in your spare parts collection.