Shimano Sora R3000 Rear Derailleur The Sora R3000 Rear Derailleur for 9-speed drivetrains delivers the smooth-shifting reliability we have come to expect from mid-range Shimano components. The Shimano rear mech is made for road bikes with 9-speed cassettes. Smooth alloy construction with steel cage and hardware. The Shimano Sora R3000 rear gear is routinely fitted to road bikes costing between approx ?400 and ?1,300. Its advanced light action makes for smooth, low-friction shifting up and down the rear cogs and front chainrings. The wide link design makes for increased rigidity and precise gear shifts. The 11-tooth pulley wheels make for reduced wear and chain noise. The pulley wheels' sintered alloy bushings promote smooth-running performance. Recommended total capacity: 43t. Rear cog maximum range: 11-34t. Weight: 278g - based upon weighing a Shimano Sora R3000-GS Rear Derailleur in July 2016. Be aware that cycling equipment specifications can change without notice so please regard our published weights as an honest but approximate guide.