The Shimano RD-M3100 Alivio Rear Derailleur is a high-quality component designed for smooth and reliable shifting performance on your mountain bike. Weighing just 315 grams, this rear derailleur is lightweight yet durable, making it ideal for off-road adventures. The RD-M3100 features Shimano's Shadow RD+ technology, providing a low-profile design that reduces the risk of damage from rocks and branches. With a maximum sprocket size of 36T and a total capacity of 41T, this derailleur is compatible with a wide range of gearing setups. The Alivio rear derailleur also boasts a long cage design for improved chain retention and stability over rough terrain. Upgrade your bike's shifting performance with the Shimano RD-M3100 Alivio Rear Derailleur.