Joined: Oct 2008
Posts: 659
Likes: 232
From: Tidewater VA
Bikes: 1975 Raleigh Gran Sport, 1978 Bertin C35, 1982 Trek 614, 1983 Trek 620, 1984 Nishiki Seral, 1995 Mercian Ko’M, 1998 Fisher HKEK, 2000 Rivendell RS, 2001 Heron Touring, 2016 Nobilette Custom
At first I thought you must be mistaken, but since the '84 catalog scan on Velobase came from me, I dug it out and sure enough, there it is. In the photos they definitely look like they have the same cage length and geometry.
If you look at the "Gold Range Touring" derailleurs, there's no difference in capacity between the straight parallelogram 5500 GT/SP and the drop parallelogram 6600. Why wouldn't the same be true for the 5500 and 6600 T/SP?
I think the capacity shown for the 6600 T/SP is either a typo, or a bit of fiction designed to let the consumer know that this is their serious "racing" derailleur. I wouldn't be afraid to try one with a 28t cog.
Last edited by SuperLJ; 01-22-13 at 06:34 AM.