Shimano Ultegra RD-R8000 GS 11Spd Shadow Rear Derailleur - SoCal Bike - Oceanside, Carlsbad and north San Diego county's favorite bike shop, Bicycle and ebike rentals, sales, and service
Shimano Ultegra Di2 RD-R8050 GS 11s Road Bike Rear Derailleur Medium FOR PARTS | eBay