The Gear Mech Derailleur Hanger is a silver rear derailleur part designed to fit Decathlon Rockrider, Riverside, and B’Twin bikes. This set includes the necessary derailleur hanger to ensure smooth and precise gear changes. Manufactured in an unknown location, this durable component is essential for maintaining optimal performance and functionality of your bicycle's rear derailleur system. Whether you are a casual rider or a cycling enthusiast, this gear mech derailleur hanger from B’Twin will help keep your bike running smoothly on your adventures.