Originally Posted by
Andy_K
I'm of the opinion that the RD-5600 and RD-6600 rear derailleurs were the peak of Shimano's product line for balancing cost, functionality, and aesthetics. I've used both the 105 and the Ultegra, and I can't tell a difference in quality between them. Even the finish is pretty similar in the silver models.
Here's the 105 on my Canondale ST400.
Here's the "ice grey" version of the Ultegra on my Huffy Aerowind. (Yes, I really did that.)
The GS versions of these will handle a 28T cog, maybe a bit bigger, and a triple crankset.
The 5700/6700 stuff started looking more chunky IMO, and it doesn't really perform any better.
Love that Ultegra on the Huffy! It looks sweet with the yellow housing against the metallic gold/brown paint. I bet it shifts very crisp. Nice upgrade!