Amazon.com : Shimano Ultegra Di2 RD-R8050-SS Rear Derailleur - 11 Speed, Short Cage, Black : Sports & Outdoors
Amazon.com : SHIMANO CS-HG50 11-28 8-Speed Hyperglide Cassette : Bike Cassettes And Freewheels : Sports & Outdoors
Amazon.com : BOLANY Bike 10 Speed Cassette 11-25T/32T/36T/40T/42T/46T/50T Fit for MTB Bike, Road Bicycle, Lightweight Freewheel Super Light, Compatible with Shimano SRAM Sunrace (Black+Silver 11-40T) : Sports & Outdoors