R-series rear derailleurs are designed to work with 7, 8 ,9, and 10-speed Shimano-compatible road shifters. These R9 rear derailleurs combine the benefits of R10 and R8 rear derailleurs: compatibility friendly, weight saving, and robust.
The SHIMANO ALIVIO M3100 rear derailleur delivers a low profile design that lets you ride aggressively with fewer interruptions thanks to its SHIMANO SHADOW design.
A low cost derailleur hanger extender for those looking to play around with 1x conversions, or get up to no good with some whacky double configuations.