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PostPosted: Thu Aug 14, 2014 10:22 pm 
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Joined: Thu Aug 14, 2014 4:56 pm
Posts: 4
So if you want to run 32 you have to get an ultegra rear mech?


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Posted: Thu Aug 14, 2014 10:22 pm 


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PostPosted: Thu Aug 14, 2014 11:50 pm 
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Joined: Thu Jun 09, 2011 4:10 pm
Posts: 285
Your options are:

1) Try the RD-90x0 and see if it works well enough. This will likely depend on how big a jump your front rings have, your frame geometry, its derailleur hanger, and your tolerance for slower shifting.

2) Stick on a RD-68x0 GS, which handles up to 32.

3) if using Di2, use an XTR RD-9050 GS or SGS (this gets you up to 40T rear cassettes IIRC)

4) Swap a RD-6800 GS cage onto your RD-90x0, and live with the alloy cage.


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PostPosted: Fri Aug 15, 2014 12:13 am 
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Joined: Mon Apr 21, 2014 9:17 pm
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I have a RD-9070 and tested a 32T cassette yesterday (on the bike stand only). It works, but you have to set the B-screw all the in so that the upper pulley don't touch the cassette. Another thing, the big chaingring and big sprocket combination looks like something will break! hahahaha... Other combinations works.


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PostPosted: Fri Aug 15, 2014 11:12 am 
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4) Swap a RD-6800 GS cage onto your RD-90x0, and live with the alloy cage.

Would that affect the shifting at all?


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PostPosted: Fri Aug 15, 2014 5:09 pm 
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Joined: Thu Jun 09, 2011 4:10 pm
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It should shift at least as well as the medium cage RD-68x0.

The only possible difference is if the GS version of the RD-68x0 tracks across the cassette at a different slope so that it stays closer at the bottom of the cage. I assume it wouldn't be worth their tooling costs to have separate parts, but it'd be interesting to take the SS and GS versions and measure them to see though. The bodies of the derailleurs are also just stamped RD-6800, so I assume they are the same between ss and gs versions.


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PostPosted: Sat Aug 16, 2014 5:58 am 
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Joined: Wed Feb 09, 2005 4:51 am
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The RD bodies will be identical. The difference is really in the subtle geometry tweaks of the cages ( Besides it being obviously longer ).


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PostPosted: Thu Sep 25, 2014 9:04 pm 
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Joined: Fri Aug 09, 2013 1:10 pm
Posts: 25
My wife wanted to run an 11-32 cassette instead of a 11-28 cassette on her Canyon Ultimate CF SLX 7.0, running Ultegra 6870 Di2. Having read the posts on this thread and sending an email to Canyon I can confirm that her short cage rear mech can run the cassette, without the need of the GS cage, longer chain or different hanger. Having installed the new cassette, all that was required was to wind the B screw in a few turns. All gears run fine, even the 50T – 32T & 34T – 11T.

This post was just to thank the contributors of this thread to give me the insight and confidence to have a go. It saved me a fortune in changing mechs, chains etc., so thank you.


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PostPosted: Fri Sep 26, 2014 7:56 pm 
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Joined: Mon Apr 21, 2014 9:17 pm
Posts: 75
Nice. Two weeks ago I did a uphill sufferfest race (132km, 4000m ascent, two 15+km climbs with the last one peaking 23% for 1km). I used the 11-32 with the SS RD-9070 and it worked great (b-tension screw set all the way in)... The 50x34 combo was used a few times when distracted... worked fine


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