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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.

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Shimano Ultegra RD-6700 Rear Derailleur

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Here's what others have to say...

5 5

Not as Pretty but Just as Functional

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.

Unanswered Question

Hi I have Tiagra shifters and Tiagra rear...

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)

Hi I have Tiagra shifters and Tiagra rear...
5 5

Classic quality, classic Value

Straight ahead Ultegra. Best price on the internet- short cage seemed to work just fine with my compact double and ten speed casset.

Unanswered Question

I have a 9-speed with a Shimano 105 (5501)...

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?

I have a 9-speed with a Shimano 105 (5501)...

i want a more smooth shifting experience....

i want a more smooth shifting experience. i have the shimano 105 on it what would anyone recomend to put on instead

Responded on

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.

how much better is this rear derailleur...

how much better is this rear derailleur compared to the shimano 105

Responded on

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...

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????

I just wrapped my 2007 Ultegra rear...
Responded on

This model will work fine. Its just a new model that looks a little different. It works just the same as the old model. Just make sure you get the long cage.

Unanswered Question

I need to replace a Shimano Ultegra RD-6600...

I need to replace a Shimano Ultegra RD-6600 ss (short cage) rear derailleur. Can I replace it with the RD-6700?

5 5

Smooth and Fast

This rear derailleur is super smooth and fast shifting up and down. It makes racing so easy being able to shift so quick and crisply.

how do i know if i need a long cage or...

how do i know if i need a long cage or short cage?

Responded on

If you have two chain rings up front go Short-cage, if you have three (a triple) go with a Long-cage.

Responded on

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.

I have an FSA Gossimer crank (a double)....

I have an FSA Gossimer crank (a double). Will this be compatible with it? Also, I have 105 shifters. Will I have to change them? Thank you in advance.

Responded on

Yes, that is a pretty common setup and will work fine for you.

5 5

Fantastic upgrade piece

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.

Fantastic upgrade piece
Responded on

(edit to my previous post) Got a picture of both my Ultegra RD and new Ultegra cassette.

Would this derailleur be compatible with...

Would this derailleur be compatible with a Fulcrum Torq RS crank (compact)?

Responded on

I would Recommend using the 6600 or 7800 Chain and of corse Shimano Sti, Frt Der and Cass.