Enhance your mountain or road bike’s shifting performance with this high-quality Rear Derailleur Extension Tail Hook, designed to accommodate a wide range of flywheel sizes including 40T, 42T, 46T, 50T, and 56T for mountain bikes, as well as 32T, 36T, and 42T for road bikes. Crafted from durable aluminum alloy using precision CNC technology, this extension provides a sturdy and long-lasting solution that ensures smoother gear transitions and improved riding experience. Key Features: · Wide Compatibility: Suitable for rear derailleur extension on mountain bikes with flywheels ranging from 40T to 56T and road bikes with 32T to 42T, offering versatile application for various cycling setups. · Smooth Gear Shifting: Designed to expand flywheel speed smoothly, enhancing gear changes and overall cycling performance. · Durable Aluminum Alloy Construction: Manufactured with premium aluminum alloy and CNC machining for superior strength, durability, and long service life. · Lightweight Design: Weighing approximately 20g, it adds minimal weight to your bike while delivering maximum functionality. · Stylish Color Options: Available in black and red, allowing you to personalize your bike with a bright and attractive accent. Specifications: · Item Type: Rear Derailleur Extension Tail Hook · Model: YC-02 · Material: Aluminum Alloy · Weight: Approx. 20g · Compatible Flywheel Sizes: 40T/42T/46T/50T/56T (Mountain Bike), 32T/36T/42T (Road Bike) · Available Colors: Black, Red Package Includes: · 1 x Rear Derailleur Extension Tail Hook Upgrade your bike’s drivetrain with this reliable and stylish Rear Derailleur Extension Tail Hook, engineered to provide smoother shifting and enhanced performance on a variety of mountain and road bikes. Its robust construction and precise fit make it an essential accessory for cyclists seeking durability and improved gear responsiveness.