10 speed and 11 speed compatibility question

Discuss light weight issues concerning road bikes & parts.
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pamountainbiker
Posts: 64
Joined: Mon Jan 12, 2009 3:49 am

by pamountainbiker

Hi all,

Looking to add an older 2007 Shimano XTR M970 rear derailleur to a road bike and pair it with Ultegra 6800 11 speed shifters. Is this even possible? Searched The Google and while it won't work with a Dynasys rear der, my old XTR unit is not Dynasys (pre Dynasys), so the info I've found is inconclusive. I'm building up a gravel bike and have a nearly NOS condition M970 rear der which would be nice to use if I can.

Thanks!

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ITTY
Posts: 222
Joined: Wed Apr 09, 2014 8:08 pm
Location: Bremerton, WA

by ITTY

You will most likely be disappointed by shifting performance, but the derailleur will move the chain...
Moloko Plus 6.24 kg

"We haven't located us yet"

pamountainbiker
Posts: 64
Joined: Mon Jan 12, 2009 3:49 am

by pamountainbiker

Thanks, I think I figured it out. A 9 speed Shimano mountain derailleur will that is pre Dynasys will work with 11 speed Ultegra 6800. It should shift normally.

kramnnim
Posts: 49
Joined: Mon Aug 30, 2010 10:18 pm

by kramnnim

Hmm, does that mean that a 6800 RD would work with 10sp shifters/cassette?

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