Shimano Deore RD-M5100 10 11 Speed Rear Derailleur Shadow Plus Wide range 11-51
£38.50
M5100 is designed for 51t rear cassette largest sprocket. It will work with 48t or 46t, but not well on smaller than 46t. Designed to work on 11-51 wide range cassettes but will work fine with smaller range cassette.
