I used a Huret Duopar on my ’81 Ritchey MTB for over 25 years (until the bike was stolen!
Grrrr!). It was fabulous. I never felt let down.
I used a Cyclone GT Mk 1 for somewhat longer on a mid-70s PX-10, until I sold that frame last summer. It was so great a performer that I simply stopped thinking about it.
I have a NOS Suntour SVX-GT that I have never used, but is not only the last of the VX line but also, supposedly, optimized for 7 speeds. Someday, I might try it.
That said, I cannot deny that I have an absolute love affair with the Campy Rally – both the first and third generation models. They’re just soooo sexy looking.
BUT: The determining factor in performance, IMHO, is a Hyperglide freewheel and a good chain. Adopting these, I discovered my Rally suddenly shifted incredibly better than before. Smooth and sure. It really IS about the freewheel!
SO, I really want to thank everyone here for the serious trash-talking of the Rally. Because of that, I just scored a NOS 3rd Gen Rally as the only bidder! I couldn’t believe it.
I have no idea if the 3rd Gen Rally will shift any differently than the 1st Gen Rally, but it is a stunning piece of hardware.
I’m putting together my own Classic Grail bike and this wonderful piece is going to it. So, thank you all for ignoring the Rally(s). I was convinced I’d never be able to afford one.
THUS, without doubt, I agree that the Duopar, and the Suntour VX and Cyclone GT models, are probably the best functioning wide-range classic derailleurs. But I’m thrilled with my new acquisition.
Thank you all!
Cheers!