microSHIFT R9 RD-R43M 9/10 Speed Rear DerailleurProviding an excellent combination of strength and durability, this road bike rear mech features a hard-wearing steel cage for tackling every mile of road. Built for the challenges of modern road cycling, this model also comes equipped with a weight-saving aluminium bracket body and outer link construction for a superior strength to weight ratio. As a result, you'll enjoy its smooth and reliable shifting performance, without worrying about adding any unnecessary excess grams to your ride. Compatible with Shimano 9/10 speed road drivetrains, this is a perfect choice for completing your next build or replacing old parts on your existing road bike.Features: Cage Material: Steel Outer Link Material: Aluminium Use: Road Speed: 9/10 speed Cage Length: Medium Cage Max Cog: 30-34T Capacity: 39T Clutch: No Compatibility: Shimano RoadTechnologies: Weight-saving aluminium bracket body and outer link. Steel cage.Manufacturer's Part Number: RD-R43M Black Medium CageBuy microSHIFT Components from Chain Reaction Cycles, the World's Largest Online Bike Store.