Equivilant replacement derailleur for Shimano RD-M739 SGS, Deore XT- Mtbr.com
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  1. #1
    mtbr member
    Join Date
    Jun 2018

    Equivilant replacement derailleur for Shimano RD-M739 SGS, Deore XT


    I have a 1996 GT LTS-1 that I need to replace the rear derailleur on. It has a Shimano RD-M739 SGS, Deore XT. I upgraded the cassette to a 34T and need get a derailleur that will work with that cassette. I'm looking at the Shimano Acera M360 7/8-Speed Rear Derailleur and wondering if anybody has a better suggestion or can confirm this is an equivalent derailleur.


    David Logan

  2. #2
    Sneaker man
    Reputation: mik_git's Avatar
    Join Date
    Feb 2004
    I Think - (pretty sure, but could be wrong) a 9 speed derailleur will work with an 8 speed cassette and shifter. Others will chime in with actual facts, but I'd go a much newer 9 speed XT rear mech like a 770 series or similar (I have 2 running 34 tooth cassettes and work fine...but they are 9 speed front to back)

    But the Acera is not the equivalent derailleur, it is waaay lower end. Work yes, but I wouldn't personally put it on that bike unless true emergency, but if that's all you can get, then it may have to do. (as in It's a nice bike, thats a low end part. XT is 7xx series, Acera is 3xx, so 4 levels lower)
    All the gear and no idea.

  3. #3
    Bikes in jeans
    Reputation: jestep's Avatar
    Join Date
    Jul 2004
    Yes, either 8 or 9 speed would work, both are usually easy to find on ebay in very good condition. One thing to be cautious of is the rapid rise versions that are out there. But I'd be looking at a 9sp XT or XTR.
    WTB: Med Bontrager Ti Lite, PM Me...

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