With stable shifting performance guaranteed by the SHIMANO SHADOW RD design, the R7000 rear derailleur is compatible with 11-speed road drivetrains only.
Shimano redesigned the 11-speed derailleur pivot point. It will not function property as a upgrade derailleur combined with Shimano's older 9 or 10-speed cassettes and shifters.
SS / Short - 11 speed
GS / Medium - 11 speed