Results 1 to 7 of 7
  1. #1
    Vaginatarian
    Reputation:
    Join Date
    Oct 2005
    Posts
    5,686

    chain rings compatible

    are the 2x10 and 3x10 chain rings interchangeable?
    I may want to go 2x10 with a bash guard but I like the 24 t granny on the 3x10
    in other words can I use a 24t granny instead of the 26 or 28 that comes on the 2x10

  2. #2
    mtbr member
    Reputation:
    Join Date
    Aug 2010
    Posts
    1,380
    It depends on which crankset you are talking about. I believe the XTR trail double has a different bolt pattern than the race double. If you are just talking about XT and below, I believe the answer is yes.

    If you want 2x10 with a bash guard and a 24T granny, just get the triple and replace the big chainring with a bashguard.

    Like this:
    Attached Thumbnails Attached Thumbnails chain rings compatible-tallboy-cranks.jpg  


  3. #3
    mtbr member
    Reputation: Dover's Avatar
    Join Date
    Jan 2006
    Posts
    481
    2X10 has a different BCD than 3X10 on the XTR Crank. all of the XT cranks (M780 series) have the same BCD

  4. #4
    mtbr member
    Reputation:
    Join Date
    Aug 2010
    Posts
    1,380
    Quote Originally Posted by Dover View Post
    2X10 has a different BCD than 3X10 on the XTR Crank. all of the XT cranks (M780 series) have the same BCD

    2x10 Race is different.
    2x10 Trail is the same.

  5. #5
    Vaginatarian
    Reputation:
    Join Date
    Oct 2005
    Posts
    5,686
    so, I could get a 3x10, pull the big ring add bash guard and change the granny from 22 to 26 or 28?

  6. #6
    mtbr member
    Reputation:
    Join Date
    Aug 2010
    Posts
    1,380
    Quote Originally Posted by dan0 View Post
    so, I could get a 3x10, pull the big ring add bash guard and change the granny from 22 to 26 or 28?
    Yes, but a 26/32 or 28/32 is pretty close gearing. You might want a 36 or larger middle ring to provide a good range.

    The XTR Trail double is a 26/38 and you can fit a bashguard to it if you want.

    The XT double comes in a 26/38 or 28/40. It uses the same bolt pattern as the inner 2 chainrings on the triple, but the spider is different so it may not fit a bash guard. I assume you could put these chainrings on an XT triple crankset and then add a bash guard, but I haven't actually tried this.

    SRAM has various 2X chainring options including 22/36, 24/38, 26/39, and 28/42, The 26/39 and 28/42 use an 80/120 BCD. The 22/36 and 24/38 use a 64/104 BCD, essentially the inner 2 chainring positions on the triple spider, and you can fit a bashguard if you want.

    For a 29er trail bike, riding slower technical trails, I personally prefer a triple crankset with the big ring replaced with a bashguard. The 32T (Shimano) or 33T (SRAM) middle chainring with an 11-36T cassette allows me to mostly stay in that chainring, like a 1x10 setup, but I have the 24T or 22T granny for the really steep climbs or as a bailout gear if I need it.

  7. #7
    Vaginatarian
    Reputation:
    Join Date
    Oct 2005
    Posts
    5,686
    Quote Originally Posted by jabrabu View Post
    Yes, but a 26/32 or 28/32 is pretty close gearing. You might want a 36 or larger middle ring to provide a good range.

    The XTR Trail double is a 26/38 and you can fit a bashguard to it if you want.

    The XT double comes in a 26/38 or 28/40. It uses the same bolt pattern as the inner 2 chainrings on the triple, but the spider is different so it may not fit a bash guard. I assume you could put these chainrings on an XT triple crankset and then add a bash guard, but I haven't actually tried this.

    SRAM has various 2X chainring options including 22/36, 24/38, 26/39, and 28/42, The 26/39 and 28/42 use an 80/120 BCD. The 22/36 and 24/38 use a 64/104 BCD, essentially the inner 2 chainring positions on the triple spider, and you can fit a bashguard if you want.

    For a 29er trail bike, riding slower technical trails, I personally prefer a triple crankset with the big ring replaced with a bashguard. The 32T (Shimano) or 33T (SRAM) middle chainring with an 11-36T cassette allows me to mostly stay in that chainring, like a 1x10 setup, but I have the 24T or 22T granny for the really steep climbs or as a bailout gear if I need it.
    thats what I am using now, xcept I have a 21t granny. my problem is my new WFO frame has a bolt on fd and the granny rubs on the cage in all but the 2 lowest (biggest) cogs. I dont really see much to offer for 29ers in the new 2x10 setups as they have too high a gear range
    for our type riding but there seems to not be any options for bolt on fd except in the 10 speed type.

Similar Threads

  1. Newb: need advice on replacements for chain rings, cassette and chain
    By Porschefan in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 1
    Last Post: 03-20-2011, 01:53 PM
  2. SRAM/TruVativ XX compatible Q-Rings
    By nofish in forum SRAM
    Replies: 17
    Last Post: 06-10-2010, 07:43 PM
  3. m760 xt rings compatible with m960 xtr ??
    By TallChris in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 2
    Last Post: 04-20-2009, 06:54 PM
  4. Dropping Chain with new Chain Rings, Chain and Shifters
    By mtbvfr in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 7
    Last Post: 09-13-2007, 04:05 PM
  5. Chain skipp / lashed and dropped from front chain rings during rough climb
    By peanut_man in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 2
    Last Post: 08-04-2007, 01:45 PM

Posting Permissions

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