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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: 282
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
Posts: 73
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
Posts: 1710
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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