Reliable: Our mountain bike rear derailleur protector is designed to withstand the toughest terrains and provide long-lasting performance. It is made of high-quality steel material that is resistant to impact and wear, ensuring its durability and reliability. .Quick Installation: This product is used to install onto the axle, not the derailleur nut. The single fixing hole allows for easy installation, just fasten it into the corresponding hole. Special Design: The transmission protector adopts an arch angle design, which makes the protector less likely to deform under strong impact. If your derailleur is not protected, the rear derailleur guard is definitely a worthy choice. Provides effective protection: The bicycle derailleur protector provides effective protection for the rear derailleur, preventing the derailleur from being hit, deformed or shifted during riding; it can also be used to protect the rear derailleur, which is very reliable. Versatility: Our mountain bike rear derailleur protector is compatible with a variety of mountain bikes, making it a versatile choice for riders of all levels. Whether you are a beginner or an experienced rider, our rear derailleur protector will provide the necessary protection and performance enhancement for your mountain bike adventure.