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I need a new RD!!

Old 03-19-19, 11:14 AM
  #1  
Tandem Tom
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I need a new RD!!

Last year I picked up a used Shimano M739 Deaore XT RD to replace the Shadow RD. It worked very well for our tour in Europe.
But as I am looking over the bike today I notice the pivots are now quite worn and the upper jockey wheel is out of alignment to the cassette.
So I am looking for a replacement recommendation.
My set up a 9 speed but the M739 was an 8 but worked great!
Thanks!!
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Old 03-19-19, 11:52 AM
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Deore M591 or M592 shadow
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Old 03-19-19, 11:57 AM
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Be Sure the Derailleur hanger is not bent out of alignment...
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Old 03-19-19, 12:07 PM
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Shimano still markets several 9 speed non-shadow derailleurs (M591 is Deore level, M771 is XT level). The M739 you bought must have already been worn; normal wear and tear from 1 tour (or even full year) would not result in the wear you are describing. I at least one M739 that has over 10 years/1000's of miles of use and it still works as good as when new.
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Old 03-19-19, 12:31 PM
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Originally Posted by Tandem Tom View Post
... the upper jockey wheel is out of alignment to the cassette...
Note that many upper wheels "float" sideways to aid in shifting, so may not indicate wear. How does it shift?
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Old 03-19-19, 01:09 PM
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Tandem Tom
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The hanger is in alignment. The pivot points on the deraileur are worn and causing the problem. No Shadow. Could never get a good shifting all the way across the US! The 591 is looking good.
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Old 03-20-19, 02:44 AM
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Originally Posted by Eggman84 View Post
Shimano still markets several 9 speed non-shadow derailleurs (M591 is Deore level, M771 is XT level).
They have also the trekking type (T) derailleurs, which are non-shadow. Only Acera T3000 and Alivio T4000 are 9 speed though; LX T670 and XT T780 are 10 speed , i.e. different cable pull ratio. So you'd probably be better off with the aforementioned M591 or M771.
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Old 03-20-19, 05:41 AM
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Tandem Tom
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Thanks for your reply. Though I wouldn't mind going with XT level I really like having a barrel adjuster on the RD.
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Old 03-20-19, 11:03 AM
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Add one inline on the rear cable loop housing..
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Old 03-20-19, 11:06 AM
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Yes, there's the Altus M2000, Acera M3000, and Alivio M4000...all are Shadow (non-Plus, so no clutch), all are 7/8/9-speed compatible, and all have barrel adjusters. As noted above, the Acera T3000 and Alivio T4000 are conventional trekking derailleurs that are also 7/8/9-speed compatible.
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Old 03-24-19, 09:35 PM
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Originally Posted by Tandem Tom View Post
Thanks for your reply. Though I wouldn't mind going with XT level I really like having a barrel adjuster on the RD.
The Deore M591 has the adjusting barrel (https://www.universalcycles.com/shop...70&category=72).. Unfortunately the XT level does not have an integrated adjusting barrel so you wither need the adjustable cable stops on the down tube braze-on (https://www.universalcycles.com/shop...&category=1613 what I use) or inline adjuster.
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Old 03-25-19, 05:33 AM
  #12  
Tandem Tom
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My M591 is due to arrive today!
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Old 03-25-19, 06:08 AM
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Originally Posted by Tandem Tom View Post
The hanger is in alignment..
I take that to mean that you checked with an alignment tool, because otherwise you would have just been guessing.
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Old 03-25-19, 06:13 AM
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Tandem Tom
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Yep, I used an alignment tool. The pivot points on the deraileur are worn out.
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