Upgrade your cycling setup with the microSHIFT M21 Rear Derailleur - the perfect solution for versatile 6- and 7-speed mountain and road bikes. Crafted for durability and performance, this rear derailleur features a robust combination of composite and steel construction, ensuring reliable shifting in demanding riding conditions. Designed with precision engineering, the M21 derailleur is compatible with 6- and 7-speed mountain and road shifters, making it a flexible choice for a wide range of bicycles. Its short cage design offers excellent chain wrap capacity of 39 teeth, enabling smooth gear transitions across a wide gear range. The derailleur's maximum cog size of 30 teeth allows you to dial in your optimal gear ratio for climbing or cruising. Built with a dropout claw hanger mount, the M21 derailleur provides easy installation and compatibility with various dropout standards. Its sleek black finish adds a professional look to your bike while ensuring longevity and resistance to the elements. Whether you're upgrading an existing bike or building a custom ride, the microSHIFT M21 Rear Derailleur delivers precise, dependable shifting for mountain biking, commuting, or recreational riding. Maximize your bike's performance with this affordable, component that combines innovative technology with durable materials for outstanding cycling experience.