Looking to replace my rear derailleur which is 7800 with 7900; however, I am not planning to change my 7800 shifters.
I see that the 7900 has a slightly longer cage to “accommodate Shimano’s extended range cassettes,” but b/c I run only 10 speed I do not need a longer cage.
Is the 7900 rear derailleur compatible with (meaning will it work flawlessly) with my 7800 shifters?
Bonus Question: What about the 7900 front derailleur with my 7800 brifters?