Enhance your cycling performance with this high-strength steel cassette freewheel, engineered for extreme rigidity and durability. Designed to provide smooth and precise gear changes, this freewheel features a carefully optimized cog ratio ranging from 9 to 42 teeth (9-11-13-15-18-21-24-28-32-36-42T) to offer a versatile gear range suitable for various terrains and riding styles. Its improved structural design ensures smoother shifting, minimizing friction and improving overall drivetrain efficiency. Fully compatible with XD driver systems, this freewheel is an ideal upgrade for cyclists seeking reliable, high-performance components. Key Features: · High-Strength Steel Construction: Built for maximum rigidity and long-lasting durability to withstand rigorous riding conditions. · Wide Cog Range: Includes 11 cogs from 9T to 42T allowing for flexible gear selection to tackle steep climbs and fast descents with ease. · Enhanced Shifting Performance: Optimized tooth profile and structure provide smoother and more accurate gear transitions. · XD System Compatibility: Designed to seamlessly fit XD driver hubs, ensuring compatibility with a wide range of modern mountain bike drivetrains. · Lightweight Design: Weighs only 437g (15.4oz), balancing durability with minimal added weight to maintain bike agility. Specifications: · Material: Steel · Cog Teeth Sizes: 9-11-13-15-18-21-24-28-32-36-42T · Weight: 437g (15.4oz) Package Includes: · 1 x Cassette Freewheel This high-quality steel cassette freewheel delivers robust performance and reliable gear shifting for mountain biking enthusiasts and professional riders alike. Upgrade your bike’s drivetrain with this precision-engineered freewheel to enjoy enhanced control and a smoother riding experience on diverse trails.