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Discussion Starter · #1 · (Edited)
Somehow a stick jumped up this morning on the woods trail I was on and I broke the Shimano Altus rear derailleur on my 2010 Giant Boulder.

It has Shimano EF-50 7 speed shifters, Crank: 28/38/48, Cassette: 14/16/18/20/22/24/34.

I found a good price on a Shimano LX M581 and was considering it. Any reason why it wouldn't work for me?
 

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Any Shimano or Shimano-compatible derailleur will work for you. LX is a decent choice, even a little 'excess' for a 21-speed setup. Does your 'source' have a Deore for less? Ah, forget it... get the LX.
 
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