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
Amazon.com : SHIMANO Deore RD-M5100-SGS Rear Derailleur - 11-Speed, Long Cage, Black : Sports & Outdoors
Amazon.com : MEGHNA Shimano Groupset 12 Speed MTB Bike Rear Derailleur RD-M6100-SGS 12 Speed Right Shifter Lever SL-M6100-R 12 Speed for Mountain Bike : Sports & Outdoors