Ultegra 6600 chain ring with R8000 GS-11 - 11-32 cassette

IanMSpencer wrote:

The issue is the extra gear with a 6600 10 speed shifter, will not work. The spacing is wrong, so you end up needing new shifters. 

The problem around the front mech is one of toleranaces and there are lots of combinations of shifters and derailleurs that can be made to work and the 11 speed chain on a 10 speed crank is OK, but as I said, not the problem here.

So, if the question is what to put on the back to accommodate a 34 sprocket cassette, you probably need to be looking at Tiagra.

On my old bike I am running Tiagra 4600 shifters with Ultegra long cage 6700 RD and 11-34 cassette with no issues whatsoever.

10s cassette? 

David9694 wrote:

10s cassette? 

Yes, sorry should have said.

Yep, I was thinking about cassettes, but yes, derailleurs themselves are generally not too fussy about the change, the movement range of an 11 speed RD is at least that of a 10 speed, and I don't think they've changed the pull ratio. But why spend the money? Recent Tiagra is sound.

IanMSpencer wrote:

Yep, I was thinking about cassettes, but yes, derailleurs themselves are generally not too fussy about the change, the movement range of an 11 speed RD is at least that of a 10 speed, and I don't think they've changed the pull ratio. But why spend the money? Recent Tiagra is sound.

It's a bit more complicated - essentially the cable pull (the amount of cable moved by the shifter per "click") and the derailleur actuation ratio (the distance the derailleur moves per distance of cable movement) need to match.

So either the combo will work perfectly, or it really won't work at all.

Mixing Tiagra 4600 with Ultegra 6600 (10 speed) is a match. 

However, if you tried to use a newer 11-speed Ultegra derailleur (R8000 series) with those same Tiagra 4600 shifters, it wouldn't work.

However, if you used the newer Tiagra 4700 shifters with that same 11-speed mechanical derailleur, it would match and again work perfectly. 

You could not mix Tiagra 4600 shifters/derailleurs with Tiagra 4700 derailleurs/shifters, despite both being 10 speed.

Because I was looking this up earlier for my own purposes: The 11-34 version of the R8000 cassette is actually a mountain bike cassette and so will fit a 10 speed hub, if the OP has one of those. Could be a money saver.

https://cyclingtips.com/2018/03/shimano-ultegra-hg-800-11-34t-cassette-r...

I would expect the 10 speed chainrings to work fine, but wonder if a bigger problem might be wear and skipping with the new chain, if they are old. 

Creakingcrank wrote:

Because I was looking this up earlier for my own purposes: The 11-34 version of the R8000 cassette is actually a mountain bike cassette and so will fit a 10 speed hub, if the OP has one of those. Could be a money saver.

You're right - I should have twigged because I have the 105 HG700 11-34 on my gravel bike and that is the same!  

11-speed shiters too

I say! Steady on!!

You need to make sure your movements are properly indexed.