Can I mix Ultegra 6500 drive train with an Ultegra 6600 Long Cage RD
I may need to replace the original Ultegra GS as I have switched to a 12-30 on my R2000. Would this be a suitable replacement to allow for the use of the 12x30?
Shimano Ultegra RD-6600 Rear Derailleur Long Cage EXC++