Sprint like Cavendish and climb like Andy Schleck.
Wider links. That's the secret sauce for better, faster shifting at the rear derailleur for Shimano's Ultegra 6700 rear derailleur. Think about how wider things are better at resisting torsional load than narrower things. Same thing for the new Ultegra design. The shift plates are wider, connecting to the pivot and knuckle further apart, and thus better to resist flexing and twisting when you shift under load.
As always with Ultegra, this is a trickle-down design from Dura Ace. So, yes, it will work with 7900 shifters no problem. It will work with old Ultegra (6600 and SL) shifters no problem. The differences, however, are many. The obvious one is that the derailleur isn't as light. There's more metal and the pulley cage is made from composite plastic rather than carbon fiber. The pulleys are the same size as DA pulleys, but run on bushings, or in tech-speak, sleeve bearings. The cage design, along with the pulley cage placement, allows this derailleur to work with cogs as tall as 28 teeth, nice for those who want a really low low gear, and still a light derailleur and fast shifting.
The Ultegra rear derailleur is designed to work with 10-cog cassettes, though it will also work with nine-cog cassettes. The limit screws are on the back of the derailleur, just above the barrel-adjuster, and can be accessed from the rear.
aluminum, composite, plastic
Maximum Front Difference:
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I swapped out my Dura Ace Derailleur for this ultegra as I changed my cassette from a 12-25 to 11-28. Absolutely no change in performance. The only difference is 60 grams of weight added and not as good looking. Do you spend 3 times the cost to say you ride Dura Ace? Easy decision for me.
Hi I have Tiagra shifters and Tiagra rear and front deralleurs. I would like to install either the Ultegra 6600 or 6700 derailleur. Can I replace the rear derailleur without having to replace the shifters? The total capacity is 31(50/34F--12/27R)
I have a 9-speed with a Shimano 105 (5501) rear derailleur with a 12/27 cassette and 39/52 chain rings. After 31k miles the rear derailleur is worn out and the pivots are sloppy. Will this one drop right in even though it is a 10-speed?
Moving up to Ultegra will make for smoother drivetrain/shifting but maintenance is the most important aspect of getting a smooth drivetrain-no matter how expensive the components are they must be properly (meaning regularly) cleaned/degreased and lubed. Installation/tweaking of the drivetrain is also a factor if you are installing yourself or having the LBS do it make sure you (or they) know what they are doing. A little patience in adjusting limit screws, etc. will be worthwhile in the long run.
Well think of it like this. There's not a HUGE difference BUT, would you rather drive a Lexus or a Toyota? Exactly. They both are cars. They both will get you from A to B, but the Lexus would make a nicer more comfortable ride.
I just wrapped my 2007 Ultegra rear derailleur 1/2 way around the axle.. Caught a spoke I think. Has a long cage. 3 front chain wheels. 10 speed. But the ones' I see for sale look like a newer version. Will the RD6700 fit my 2007 Trek 2100 ZR????
The above answer is correct for most setups, but to be absolutely sure calculate the "capacity" of your setup (difference between largest and smallest chainrings PLUS difference between largest and smallest rear cogs. Compare that number to the capacity of the rear derailleur - the capacity of the derailleur must be greater than the capacity of your setup. The 6700 GS has a capacity of 38T, the SS 33T. So if your chainrings are 50-39-30 and your cassette is 12/27 your capacity is 35T. The GS has enough chain wrap for this setup, the SS does not. You can get the derailleur capacity from the manufacturer or from tech support here at Jenson.
My first bike came with Tiagra derailleurs, and so after a while I decided to bump up to the Ultegra. Great decision, I would miss shifts every now and then when pedaling under a great load, especially climbing. With this new RD I haven't had that problem yet.