Shimano - Ultegra Di2 R8000 SS Short Cage Rear Derailleur 2X11 Speed 25-30T

RD-M3100-SGS. SHIMANO ALIVIO - rear derailleur - SHIMANO SHADOW RD - 9-speed. The SHIMANO ALIVIO M3100 rear derailleur has a low profile that allows for a more aggressive riding style with fewer interruptions, thanks to the SHIMANO SHADOW design. Low profile design. Total capacity: 45T. Max. largest sprocket: 36T. Adjusting screw

Double Servo rear derailleur with smooth, precise shifting performance and long range. The SHIMANO ACERA M3020-8 rear derailleur with Double Servo technology helps you conquer challenging terrain with fewer interruptions.

Rider tuned for sharp and silky shifts. Light shift operation with 20% less effort. Chain stability improved. New shift cable with new hyper low-friction coating technology. Easy-to-adjust chain stabilizer. Efficient pulley teeth design. New shadow design with optimized slant angle for stable gear position.

Sleek, balanced and consistent. The Tiagra 4700 series provides serious entry-level riding performance with cascaded technology from DURA-ACE. Consistently smooth and light shifting operation. Wider, Rider Tuned 10-speed gearing options. Robust adjustability.