Shimano Shadow RD R7000 105 Shadow Technology - 11-Speed Rear Derailleur Black
This derailleur provides efficient, smooth and precise shifting across standard and wide ratio cassettes, providing exceptional shifting performance. 
Shimano Shadow RD Derailleur Technology
The addition of Shadow RD Road technology ensures that the derailleur sits low-profile against the bike chainstay. It features a single-tension design so that the derailleur will be stable and not hit the chainstay when in rough terrain conditions and it also restricts chain slap and rattling when riding; it provides silent and super-smooth performance
 
Medium Cage:
Total Capacity: 39T
Max Front Ratio Difference: 16T
Low Sprocket: Max: 34T; Min: 28T
Top Sprocket: Max: 12T; Min: 11T
Maximum Cassette Size: 11-34T