malux

Hey all,

I have a 2008 trek 2.1 with a 9-speed 105 RD. The RD needs to be repalced (cage is toast...long story).

I'm thinking of upgrading to an ultegra 6700 but can't seem to get a straight answer on whether or not it will work. I've read a lot of threads of folks saying it should work, but haven't seen a report back from anyone who actually did the replacement.

Basically, i want to keep my 9 speed cassette and use the ultegra 6700. Is this a good idea or should i just replace with a 105?

Thanks!

10 Wheels

I have both and prefer the 105.

IcySmooth52

If you were to go to Ultegra 6700 you'd need to change the shifters, cassette, and probably the chain too. 6700 is a 10 speed setup.

malux

that's what I thought but a lot of what i've been reading has been folks saying: you just need to adjust the max travel and it should be fine since the index ratio is the same on 9 & 10 speeds

mechBgon

Yes, the 6700 rear derailleur will work with your existing 9-speed drivetrain.

X-LinkedRider

+1, Set the limiters.

datlas 

Yes. But if you want to "upgrade" to 10 speed you will need new shifters (and cassette, obviously, and chain).

X-LinkedRider

///

IcySmooth52

^Correct. Still a dam good deal I know.

ivan_yulaev

Are you talking about replacing just the rear derailleur? I think the 6700 rear derailleur should work fine with the 9-speed setup. But you should be able to score a 5500 or 6500-series for relatively cheap.

Here's one on e-bay.

momo15

I use a 6700 with a tiagra 9 sp set-up. I am in the process of converting the whole bike to 10sp ultegra, but in the short term, it works just fine.

Suburban Grind

I had a spoke break on my rear wheel of my 9 speed bike. It ended up catching between the chain and the tension pulley -twisted the RD around backwarks and irreparably bent the inner link on the parallelogram of the 7700 rear derailleur. Re-laced the wheel with new spokes where the chain gouged 'em, realigned the derailler hanger, and replaced the derailleur with a 7800 series 10 speed on an otherwise 9 speed setup. It is shifting as cleanly as before.

I'm sure an Ultegra 6700 10 speed RD will function just fine on a 9 speed 105 5500 setup. I'm not attracted to the aesthetic of 6700's flat black cages, but they are admittedly functional, durable, and lightweight.

I think the ratio of cable pull from the drailleur to derailleur movement remains the same (1.71?) between Shimano 8, 9 and 10 speeds (with the exception of Dura Ace 8 speed). SRAM uses a different ratio (1.39?) so you can't mix and match SRAM and Shimano shifters and derailleurs and get workable results.

c_bake

Yes, the 6700 will work fine. That's what limit screws are for. Hell, right now I have a 9 speed bike with Tiagra brifters and Suntour Cyclone derailluers from 1979. Smooth as butter.

malux

Thanks All!

just pulled the trigger on this one:
https://www.nashbar.com/bikes/Product...2_534942_-1___
$65 with shipping is a steal