Classic & Vintage - Campagnolo SR Rear Derailleur Help

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PDA
fender1
03-11-12, 07:02 PM
I picked this up for $15 but can't find a date code. The only identifying mark is that the cage is stamped ST. I know it is SR but what year?

http://i91.photobucket.com/albums/k292/bylar13/IMG_20120311_205942.jpg

repechage
03-11-12, 07:14 PM
I picked this up for $15 but can't find a date code. The only identifying mark is that the cage is stamped ST. I know it is SR but what year?

http://i91.photobucket.com/albums/k292/bylar13/IMG_20120311_205942.jpg

About 1985, the patent was expired. It is it appears of the last design, so 28 t freewheels are not a big effort. I am about to use mine on the ride home.
753proguy
03-11-12, 08:02 PM
I picked this up for $15 but can't find a date code. The only identifying mark is that the cage is stamped ST. I know it is SR but what year?

http://i91.photobucket.com/albums/k292/bylar13/IMG_20120311_205942.jpg

That is a 1986-1987 one. 1985 was still dated (with an '11' mark). Same is true for Nuovo Record ones of that vintage.

fender1
03-11-12, 08:19 PM
When did they stop making these? About 1990?
753proguy
03-11-12, 08:44 PM
1987.

C-Record debuted in 1985, and NR and SR components stopped by the end of 1987. I suspect that they ran out of unfinished pieces (to complete and sell) by then, but didn't want to scrap anything by stopping sooner than that.
Captain Blight
03-12-12, 01:16 AM
Is it just me, or does anyone else think that they developed that outer cage shape not just as a matter of style, but to help push the chain up onto that 28t cog?
rootboy
03-12-12, 04:45 AM
I think you're probably right. Their pulley cages were modified and updated through the years in an effort to improve performance.
dbakl
03-12-12, 08:34 AM
Is it just me, or does anyone else think that they developed that outer cage shape not just as a matter of style, but to help push the chain up onto that 28t cog?

Yes, but, the NRs will handle 28s.