SRAM explains XDR freehub body, which will make 12-speed road possible - Bikerumor
SRAM GX Eagle XG-1275 Cassette - 12-Speed, 10-52t, Black, For XD Driver Body - Somercycle Bike Shop
SRAM XD 11 and 12 Speed XD Driver Body Kit - ZM1 3ZERO | Part # | Worldwide Cyclery
Sram XD-R 900 Double Time 11 / 12V Freehub Body | Alltricks.com
Amazon.com : Garmin Tacx T2875.76 SRAM XD-R Exercise Fitness Cycling Standard Body for 11 and 12 Speed Bike Cassettes and Tacx Neo 2T Drive Trainers, Type 2 : Sports & Outdoors