Originally Posted by
KCT1986
With 10 speed DA shifters, you can use any road Shimano 8 (except RD-74xx, which is different),9,10 RD (except RD-4700, which is also different). For MTB RDs, only 8,9 RD will work. Shimano changed the MTB RD for 10 speed.
Thank you! Very helpful. This is exactly what I needed.