Introducing the Shimano Altus M379-SGS, a reliable and efficient 9-Speed Rear Derailleur for your bike. It's equipped with 11t upper and lower pulleys for smooth and precise gear changes. Its advanced light-action design ensures effortless shifting, even under high-torque conditions. Direct-attach rear derailleurs make installation straightforward, while the Teflon-coated bushings provide added longevity. Whether you're powering up steep climbs or navigating tricky descents, trust in the quality and performance of Shimano.