Originally Posted by
sjpitts
Can you use a Shimano RD-6400 "600" rear derailleur with a 9 speed cassette? Yes. A 12-27 cassette if that makes any difference. From what I have read, I think you can.
And can also use any 9 speed shifter-- including the ultegra and dura-ace 9 speed brifters? Ultegra, probably, and I've done it with Sora.
Dura Ace, not so sure, as it really liked to be matched to a 9-sp RD.From what I know, it's 7400-7400 and 7700-7700 and not adviseable to mix and match outside that. Others here will correct me, I'm sure. This is definitely the place to find that out.
Again, I think the answer is yes, but I am looking for some confirmation.
What about the matching front derailleur? Will it work as well? Yes.
Jared
That's what I know. I've used Shimano 600EX, Shimano 600 tricolor, and Suntour GPX FD and RD's with 9-sp shifters, and they worked well. I've not used any with Dura Ace 9-sp shifters, but when you spend the kind of money it takes to get 9-sp DA shifters, you're probably better off with a matching RD, I'd say.