Deore LX derailleurs RDM591 plus more below (berkeley)
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Preferably long cage.
(Not necessary, email me a photo.)
I want:
Deore LX derailleurs: RD-M591,592,565,567, or 550 or Altus
A compatible Shimano 9-speed rear derailleur, such as a Deore RD-M591 or Altus, is a direct replacement for a vintage 9-speed Deore LX derailleur. For 8-speed or 7-speed models, you can use a compatible Shimano 8-speed or 7-speed derailleur, respectively. Older models are often available on sites like eBay. [1, 2, 3, 4, 5, 6]
9-speed replacement
Direct successor: Shimano Deore RD-M591 or RD-M592
Other options: Any Shimano 9-speed mountain derailleur will work, including the Altus model
Important: Check that the replacement derailleur has the correct cage length (e.g., long cage) for your specific bike's gear range and cassette [1, 2, 4, 5]
8-speed and 7-speed replacements
8-speed: Look for a Shimano 8-speed derailleur, such as a Deore LX RD-M565 or RD-M567
7-speed: Look for a Shimano 7-speed derailleur, such as a Deore LX RD-M550
Note: As long as the frame has a compatible derailleur hanger, a 7 or 8-speed derailleur will likely work [3, 6]
What to consider
Cage length: Ensure the replacement has the correct cage length for your cassette and gearing. A long cage is generally used for larger gear ranges.
Compatibility: Make sure the new derailleur's speed (e.g., 9-speed) matches your shifters. Some 9-speed mountain derailleurs can also be used with 9-speed road shifters from certain model years.