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Replacing rear derailleur

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Replacing rear derailleur

Old 09-23-18, 12:36 PM
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Replacing rear derailleur

I need to replace a Shimano Deore XT M759 9 speed. Unable to find that model online or in storess. Need help finding alternative.
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Old 09-23-18, 01:17 PM
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Take a look at Microshift 9-speed mountain derailleurs. Inexpensive and good quality, and can be found from many sources on eBay. They are compatible with Shimano pull ratios for indexing.
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Old 09-23-18, 01:44 PM
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Is that a 'rapid rise' model?

I have #760 one that you can have- I hate that dyslexic POS.

Any 9 speed mtn bike RD should work fine- long or med cage to match what you have.
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Old 09-23-18, 02:41 PM
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Originally Posted by noobinsf View Post
Take a look at Microshift 9-speed mountain derailleurs. Inexpensive and good quality, and can be found from many sources on eBay. They are compatible with Shimano pull ratios for indexing.
I like this one: https://www.amazon.com/MicroShift-Ma.../dp/B00FSRUOUQ
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Old 09-23-18, 10:43 PM
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You can replace it with a new Shimano 9 speed MTB derailleur. Shimano changed the cable pull when they went designed the 10 speed MTB derailleurs (labeled as Dyna-Sys) so only a 9 speed (or earlier) will work with the shifters you are probably using (I assume indexed) . You can use either the

Shimano RD-M771 XT 9 speed Rear Derailleur - which has what I think of as a classic look


Shimano RD-M772 XT 9 Speed Rear Derailleur - which has the "Shadow" lower profile body with direct cable routing

They are about $60 to $70 new. Both have the traditional "top normal" return spring (i.e., the derailleur moves to a smaller cog when you loosen the cable tension). Make sure you get the correct length (GS medium cage or SGS long cage). If in doubt go with SGS.
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Old 09-23-18, 11:40 PM
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Even a 9 speed Acera or Alivio RDER will do the job fine.
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