Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member mazdaspeed's Avatar
    Join Date
    Jun 2007
    Location
    WA state
    Posts
    4,816
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    What derailleur for 8 speed XTR shifter?

    As far as I know I can use shimano 8 or 9 speed ones, but will anything else work? I have a few suntour derailleurs sitting here. If they won't work, would shelling out for an XTR derailleur (~50 used) be worth it over an XT derailleur (25-30 used)?

  2. #2
    Pro Paper Plane Pilot wunderkind's Avatar
    Join Date
    May 2009
    Posts
    1,624
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Any modern 7,8,9, 10 RDs will work. RDs are not very smart units. They just control the movement of the chain at the command from the shifters. The # speeds depends on the shifter and cassette.

    Which mazdaspeed you got?
    Vancouver Modern Portrait Photography

    Zenfolio.com membership discount code: UBV-HJY-SCY

  3. #3
    Senior Member
    Join Date
    Jun 2010
    Location
    Pearland, Texas
    My Bikes
    Cannondale, Trek, Raleigh, Santana
    Posts
    5,395
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    mazdaspeed, Any of the Shimano 8/9S LX, XT, XTR and maybe STX-RC will work. You'll have to experiment with the Suntour. While RDs aren't smart, they do have different pull ratios.

    Brad

  4. #4
    Guest
    Join Date
    Jul 2008
    Location
    Grid Reference, SK
    My Bikes
    I never learned to ride a bike. It is my deepest shame.
    Posts
    3,769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Exage Country, Exage 300, 400 and 500LX, Alivio, Acera X, 100GS, 200GS, STX, Deore, Deore DX, Deore LX, SLX, STX, STX RC, SIS, XT, XTR, 2200, Sora, Tiagra, RSX, RX100, 105, Ultegra, 600 Ultegra, 600, Dura Ace 9 speed will all work. There may be more. I have been told 10 speed derailleur sometimes do not fit some 8 speed chains.

    Basically any shimano derailleur designed for indexed shifting except pre-9 speed Dura Ace.

    The only ones I am not sure about are the new Dyna Sys... I thought someone told me these 10 speed MTB derailleurs would not be compatible with old MTB shifters... could just be that 10 speed derailleurs sometimes don't work well with 6-7-8 speed chains.

  5. #5
    Senior Member surreal's Avatar
    Join Date
    Mar 2002
    Location
    NJ
    Posts
    2,880
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    You'll need a rear derailer with enough range to cover the entire 8speed cassette, and it'll need to have a 2:1 ratio. Basically, most all the SRAM derailers are out of the question, but most 7, 8, or 9 speed shimano and sun derailers should work just fine. You might have some trouble in terms of chainwrap capacity and max cogs, depending on your crank and cassette, so choose a rd according to those factors. Also, XT derailers are very nice, and if you're looking at used derailers to save a few bucks, you probably aren't the type who'll "need" to spring for the used xtr.

    HTH,
    -rob

  6. #6
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,018
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Any 8 or 9 speed long cage Shimano mountain rear derailleur will work. Depending on your particular crankset and cassette some of the other Shimano derailleurs may or may not work. Surreal's post above is correct, some of the others are not.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •