Different Derailleurs with different shifters I want to install hydraulic disk brakes on my bicycle, however I also need shifters as shifters and brakes are integrated on my bike.
I have 3 speed tourney FD TY 500 triple in front and Altus MD310 rear derailleur in the back.   Now I have trouble finding rear shifter, so can I use SL M310 Shifter with an RD 310 Derailleur?
Shimano 8 speed derailleurs and Shimano 8 speed shifters are always compatible.  So yes, you can use the 8 speed M310 shifter with your 8 speed derailleur.