Nils3611

I just bought a Bianchi Infenito on eBay. Currently has a 10 speed Ultegra Group on it.

Was wondering if the Ultegra 6700 derailure (10 speed) would have the range if paired with an Ultegra 8000 (11 speed) shifter. My research lead me to believe the crankset would work so that only leaves a shifter and cassette to purchase if the derailure would work.

Thanks all.

Iride01 

Front derailleur or back derailleur? I know for a fact that Shimano 105 5800 front shifter (11 speed groupset) will work with a Tiagra 4700 front DR (10 speed groupset). Should be the same for Ultegra 11 speed to Ultegra 10 speed front DR's if that is what you are asking.

I know you didn't ask for advice, but there isn't much difference to be gained by taking a 10 speed to 11 speed. I only changed out my sons Tiagra to 105 5800 because I had the parts already for a bike I decided not to build up. So I gave them to him. But he admits he hasn't seen or felt anything significant in his performance or enjoyment.

tomtomtom123

Did you look at the compatibility chart? Shimano specs website is a useful resource that you should always look at whenever you have questions.

The chart shows rear derailleur 6700 and 4700 using different triggers for 10 speed cassette. 4700 has the same pull ratio as road 11 speed, so that would imply that 6700 would not be compatible with 11 speed trigger. I only have experience with 4700 so maybe someone else can answer your question more directly.

Nils3611

Iride01
Thanks for the rapid response. I guess I shoulda been a little more clear. I'm asking about the rear derailleur which was designed to handle a 10 speed cassette now handling an 11. When I googled the difference between the 10 & 11 speed chainrings the results were along the lines of the teeth are the same thickness they just put them a little closer together. I realize there isn't much to be gained except my other bike is an 11. Just trying to keep it all the same

Nils3611

Iride01
Thanks for the rapid response. I guess I shoulda been a little more clear. I'm asking about the rear derailleur which was designed to handle a 10 speed cassette now handling an 11. When I googled the difference between the 10 & 11 speed chainrings the results were along the lines of the teeth are the same thickness they just put them a little closer together. I realize there isn't much to be gained except my other bike is an 11. Just trying to keep it all the same

Nils3611

TomTom....
i didn't know Shimano had a compatibility chart. I will check that out.....if I can find it.

Iride01 

I think you'll need the 11 speed rear DR. If you go with a 105 5800 or other 11 speed 105 rear DR, you'll be only out a small bit of change. They'll work with Ultegra 11 speed shifters. Or you can just get 11 speed 105 shifters for cheaper still.

Many people say 105 11 speed shifts as good as Ultegra 11 speed. The big difference is going to be weight. And not much weight at that. So you have to decide if the Ultegra is worth the bigger bucks to save however many ounces that difference is.

I know the 105 5800 group I have shifts every bit as good and better than the Di2 Ultegra I also have. However there are some other advantages to Di2 that make up for the extra cost.

Koyote

Your current (10sp) wheelset may not be compatible with and 11sp cassette. And if it is compatible, you may need a spacer. I know that a 10sp Shimano freehub will not work with an 11sp cassette, unless it is a very specific 11-34 cassette. Other wheels may be different.

Definitely research this before plunging in, because it gets complicated.

shelbyfv

No. The 6700 rear derailleur will not work with 8000 or other 11 speed shifters.

Kapusta

This^^^^ is the correct answer.

zacster

https://en.wikibooks.org/wiki/Bicycl...ing_Dimensions Is one chart that I've used, but there is another Shimano one that is complicated. But the critical item is the shift ratio and cable pull. 10 is different from 11.

Nils3611

Koyote,
i didn't even think about the hub.

My thanks to you and all the other responses for making my decision much easier.

sch

There are specific Shimano 11 spd cassettes that fit fine on 10spd hubs: HG700 and HG800 both only 11-34. 11spd
ATB cassettes also work on 10 spd hubs but tend to be even larger than the 11-34 so run into RD problems and
may need an RD mount extender to work (as well as a new 7/8000 series RD which can extend to at least 11-36 natively
though Shimano does not admit to this in the interest of perfection in operation.)

FWIW some of us have found the L brifter in the 7000/8000 series to be noticeably harder to throw when upshifting than prior
series brifters. The FD in these series is a significant design change. Not all users have noted this. There was a
thread on this a few weeks ago.

Iride01 

The freehub itself is another low dollar item even if you do have to change it. I don't think you will though.

Again, unless you have to absolutely have the weight savings of Ultegra or DuraAce, you will save dollars and sacrifice little to no performance by using Shimano 105 5800 or more recent 105 models.

zacster

11sp hubs are 131mm, so they bogarted an extra mm from the 130 spec to make everything fit. But as already stated, some combos may still work with a 10sp hub. It is just 1mm.

But here's the thing, if you are buying something like 11 speed you'll want to get matching components if you are going to spend the money. I'd much rather ride a complete group where everything just works than a mix and match setup. It may work, and it may not. It may work OK and not be optimal. Why bother when a complete group will just work. And that's where these "upgrades" end up costing money. You'll end up upgrading the parts you thought you'd get away with.

Below is what it cost me to upgrade from 7 to 10, and it all started when I wanted v-brakes on my commuter bike because the cantis needed new pads. New brakes meant new levers which meant new shifters so I went 10sp, new cassette, derailleur. I ran 9 of 10 on the 7/8/9sp hub but then I wanted all 10 so new hub and relaced the wheel.