RD-M8100-SGS can't properly setup for 51T sprocket - Pinkbike Forum
Shimano Deore XT RD-M8100-SGS Outer Plate Assembly for Super Long Cage 192790593999 | eBay
SHIMANO DEORE XT M8100 12 Speed Groupset include RD-M8100-SGS Rear Derailleur and SL-M8100-R SL-M8100-IR Shifter Original Parts - AliExpress Sports & Entertainment