Ultegra RX road clutch RD for 2x11 and 2x10

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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FIJIGabe
Posts: 1567
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

Very nice. It looks very similar to the XT M8050 rear derailleur.
Madone 9 https://goo.gl/7UwZpV
Crockett https://goo.gl/f5PdCN
Madone 5 https://goo.gl/cMdyFo

Madone 4, Cobia. I own a lot of Treks.

by Weenie


emotive
Posts: 93
Joined: Tue Nov 01, 2016 10:40 am
Location: Melbourne, Australia

by emotive

I have just removed my Dura-Ace 9100 RD and installed the RX-800 to eliminate chain slap.

The shifting is not quite as crisp as the DA, but as good as the Ultegra 6800 SS on my road bike. I can live with that, plus, I have an 11-34 going onto the off-road wheels for lower gearing. Fun times!

boots2000
Posts: 1476
Joined: Mon Oct 15, 2007 9:28 pm

by boots2000

I recently set up an RX805 DI2 rear derailleur with a 34/50 crankset and an 11-40 cassette.
It shifted great with clutch off- But with clutch on, it lagged adn did not want to climb the cogset.
I discovered that it worked better with the cluth tension dialed down- near bottom of recommended range. 3nm.

boots2000
Posts: 1476
Joined: Mon Oct 15, 2007 9:28 pm

by boots2000

Another thing that I noticed is that the clutch derailleur is more sensitive to battery life.
I was adjusting with a low battery and it stopped working while the clutch was engaged- Charged it back up and all is well.
Seemed like it used up the battery more quikcly but I may have not truly had a full charge (new bike)- I have charged it fully now and I will watch it.

boots2000 wrote:
Fri Oct 12, 2018 5:19 pm
I recently set up an RX805 DI2 rear derailleur with a 34/50 crankset and an 11-40 cassette.
It shifted great with clutch off- But with clutch on, it lagged adn did not want to climb the cogset.
I discovered that it worked better with the cluth tension dialed down- near bottom of recommended range. 3nm.

spdntrxi
Posts: 1961
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

boots2000 wrote:
Thu Oct 18, 2018 6:37 pm
Another thing that I noticed is that the clutch derailleur is more sensitive to battery life.
I was adjusting with a low battery and it stopped working while the clutch was engaged- Charged it back up and all is well.
Seemed like it used up the battery more quikcly but I may have not truly had a full charge (new bike)- I have charged it fully now and I will watch it.

boots2000 wrote:
Fri Oct 12, 2018 5:19 pm
I recently set up an RX805 DI2 rear derailleur with a 34/50 crankset and an 11-40 cassette.
It shifted great with clutch off- But with clutch on, it lagged adn did not want to climb the cogset.
I discovered that it worked better with the cluth tension dialed down- near bottom of recommended range. 3nm.
that switch is fully mechanical... so I have my doubts in that thoery

j0dan
Posts: 5
Joined: Fri Sep 21, 2018 5:47 pm

by j0dan

I finished my setup with a 50/34 crank and a RX805 with 11-40t cassette. In the end I did need the RoadLink DM to get good shifting performance. If you *don't* have a RoadLink you will need a longer b-screw.

EDIT: I had an every so slightly bent hanger causing issues that the RoadLink mitigated. With a new hanger even the original hanger works great.
Last edited by j0dan on Fri Nov 16, 2018 5:58 pm, edited 1 time in total.

boots2000
Posts: 1476
Joined: Mon Oct 15, 2007 9:28 pm

by boots2000

I know But the motor has to work harder to overocme the clutch.
spdntrxi wrote:
Fri Oct 19, 2018 3:28 am
boots2000 wrote:
Thu Oct 18, 2018 6:37 pm
Another thing that I noticed is that the clutch derailleur is more sensitive to battery life.
I was adjusting with a low battery and it stopped working while the clutch was engaged- Charged it back up and all is well.
Seemed like it used up the battery more quikcly but I may have not truly had a full charge (new bike)- I have charged it fully now and I will watch it.

boots2000 wrote:
Fri Oct 12, 2018 5:19 pm
I recently set up an RX805 DI2 rear derailleur with a 34/50 crankset and an 11-40 cassette.
It shifted great with clutch off- But with clutch on, it lagged adn did not want to climb the cogset.
I discovered that it worked better with the cluth tension dialed down- near bottom of recommended range. 3nm.
that switch is fully mechanical... so I have my doubts in that thoery

pdlpsher1
Posts: 1717
Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

j0dan wrote:I finished my setup with a 50/34 crank and a RX805 with 11-40t cassette. In the end I did need the RoadLink DM to get good shifting performance. If you *don't* have a RoadLink you will need a longer b-screw.
Do you have the GS or the regular version? With the GS you shouldn’t need the RoadLink.


Sent from my iPhone using Tapatalk

romanmoser
Posts: 142
Joined: Sun May 06, 2018 8:30 pm

by romanmoser

the RX is only in the longer version ...

j0dan
Posts: 5
Joined: Fri Sep 21, 2018 5:47 pm

by j0dan

pdlpsher1 wrote:
Wed Nov 07, 2018 10:54 am
j0dan wrote:I finished my setup with a 50/34 crank and a RX805 with 11-40t cassette. In the end I did need the RoadLink DM to get good shifting performance. If you *don't* have a RoadLink you will need a longer b-screw.
Do you have the GS or the regular version? With the GS you shouldn’t need the RoadLink.


Sent from my iPhone using Tapatalk
You're right. I had a bent derailleur hanger causing my problems and they appeared to go away with the RoadLink.

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