Originally Posted by
HillRider
10-speed is the dividing line. For road rear derailleurs 10-speed is backward compatible with 7,8 and 9-speed components. For MTB derailleurs 10-speed is not backward compatible. 11-speed and above aren't backward compatible at all.
I assumed that anga is using mountain derailers. That may have been a wrong assumption but someone using 7 and 8 speed equipment at this date is probably
not using road equipment. No point in muddying the already muddy waters.