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  1. #1
    Junior Member
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    I need a new rear derailleur for a 21 spd

    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?
    Last edited by glazer1972; 12-11-10 at 11:28 PM.

  2. #2
    Senior Member JonnyV's Avatar
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    That'll work just fine. Get it. Go ride. Break more stuff. Repeat.
    Some people are just like Slinky's. Not really good for anything but they bring a smile to your face when you push them down the stairs.

    2012 Fuji Altamira 1.0

  3. #3
    unofficial roadie DirtPedalerB's Avatar
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    The number of gears(speeds) don't matter on the derailleur, the shifters control that.
    I only pedal uphill.

  4. #4
    Senior Member
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    1986 Fuji Allegro 12 Spd; 1997 Fuji MX-200 21 Spd; 2010 Vilano SS/FG 46/16
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    Here's a guaranteed match ? If you were satisfied with OEM ?

    http://cgi.ebay.com/SHIMANO-ALTUS-MT...item1c17dbb029

  5. #5
    Senior Member Deshi's Avatar
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    2009 Pake in Deep Purple, 1986 Pinarello Pista 195? Raleigh 3sp, 2003 Intense M1, 2003 Giant Yukon SS, 2010 Premium Deathtrap
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    Almost any modern derailleur will work for you. The LX is a good robust derailleur and will serve you well. That was my derailleur of choice whenI was racing downhill.

    Id say go with the LX, ride the crap out of it and enjoy.
    Quote Originally Posted by PedallingATX View Post
    dude...you can't "no ****" something THAT ****. That's like saying "sometimes I just like to make out with dudes...no ****"

  6. #6
    Junior Member
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    I ended up getting the same Altus shifter, a new chain and retruing of the rear wheel. Should last me a while longer.

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