Rear derailleur for 9-speed 11-34T/105 STI shifte

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Rear derailleur for 9-speed 11-34T/105 STI shifte

Postby Brownie » Sat Jul 05, 2014 10:52 am

Looking for some expert advise here. I am riding a 2006 LeMond Versailles Triple with 9-speed Shimano 105 STI shifters and Ultegra rear derailleur. I recently moved from Florida to Okinawa, Japan and decided I needed to upgrade the rear cassette from a SRAM 12-26T to SRAM 11-34T to help with the hills here. The upgrade works but its not ideal with the Ultegra RD (I think its a RD-6500-GS). Just a little beyond the capacity of the Ultegra - can't handle the ideal chain length and not enough clearance between the guide pulley and the 34T cog.

Researched old threads and it sounds like I need to use a 9-speed long cage MTB derailleur to be compatible with the 9-speed 105 STI shifters. I came up with a Shimano XT M771 SGS 9-Speed RD as being a good candidate for replacing the Ultegra RD and its widely available. Most other new MTB shifters are 10-speed and are not compatible with my 9-speed STI shifters, so I am told.

I'd appreciate any advice from others who have much more experience than I do if the XT M771 SGS RD is a good choice or should I consider something else. Thanks for your help.
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by BNA » Sat Jul 05, 2014 12:04 pm

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Re: Rear derailleur for 9-speed 11-34T/105 STI shifte

Postby Duck! » Sat Jul 05, 2014 12:04 pm

The M771 XT derailleur will work a charm.
I had a thought, but it got run over as it crossed my mind.
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Re: Rear derailleur for 9-speed 11-34T/105 STI shifte

Postby Brownie » Sun Jul 06, 2014 8:05 am

Thanks for posting.
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Re: Rear derailleur for 9-speed 11-34T/105 STI shifte

Postby KGB » Tue Jul 08, 2014 2:02 am

XT is a good choice but any 9 speed one should work, LX would be perfectly fine as well. I use an LX rapid rise rear derailleur on my 9 speed cross bike.
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Rear derailleur for 9-speed 11-34T/105 STI shifte

Postby toolonglegs » Tue Jul 08, 2014 6:57 am

I run that derailleur on my cross bike with an 11-34 no problems... But you do need to install an inline cable adjuster as there is no barrel adjuster on the derailleur. Unless of course you have a barrel adjuster on the frame already.
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Re: Rear derailleur for 9-speed 11-34T/105 STI shifte

Postby Blakeylonger » Tue Jul 08, 2014 9:19 am

Stick a jagwire rocket or ritchey barrel adjuster in the mech's cable stop and run the housing into that.

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