Steve,
The original SR derailleurs that had the same design as the NRs had a 26T rear sprocket capacity but I've seen them working with up to a 30T rear sprocket depending on the dropouts, chainstay length and chain ring size.
The newer model SR 4001 derailleurs also listed as a 0102018 supposedly came out in 1980 but was listed in a 1977 Campy supplement. They had a redesigned cage and were rated at 28T maximum sprocket.
I too have old legs and earlier this year I was putting together a bike with one of these derailleurs. I tried to use a Campy Victory crankset with 50-35 chainrings with a 13-28 freewheel.
The derailleur didn't have enough chain wrap to work with the 35T chainring and I had to go all the way up to a 38T ring to get it to work properly.
Chas. Colerich Oakland, CA USA
Steve Whitting wrote:
> I used to know this (17 years ago). At 54, my legs (and memory) aren't quite what they used to be. (I guess you can blame it on the beer . . . )
>
> What is the recommended max range (freewheel/chainrings) of an early 80s Campy Super Record rear derailleur? I seem to recall it being able to handle a 14-28 freewheel with 52-42 up front.
>
> (I still run a 13-23/52-41 combo on my Ciocc.)
>
> Thanks,
>
> Steve Whitting
> "The Ciocc Cat"
> Prairieville, Louisiana USA
> Website at http://ciocc-cat.angelfire.com/