- Product Details : The bicycle freehub body features a 3P ratchet mechanism with hook spring, a dual-bearing construction, and supports a 12 mm thru-axle. - Package Contents : Each package includes one 12-speed bicycle freehub body, compatible with a variety of bicycles including mountain bikes and road bikes. - Durable Material : Crafted from high-quality aluminum alloy, this freehub body ensures exceptional durability and longevity, making it a reliable choice for any cycling enthusiast. - Enhanced Gear System : This freehub body is designed to upgrade your bike from 9 to 11 speeds to a full 12-speed system, enhancing your riding experience and performance. Practical Applications : 1. Mountain Biking : Upgrade your mountain bike for improved gear shifting and a smoother ride on rugged terrain. 2. Road Cycling : Enhance your road bike's drivetrain with a 12-speed system for increased speed and efficiency during long rides. 3. Bike Customization : Perfect for cyclists looking to customize their bikes for optimal performance and adaptability to various riding conditions.