40t cog cassette with sram derailleur- Mtbr.com
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  1. #1
    mtbr member
    Join Date
    Jan 2009

    New question here. 40t cog cassette with sram derailleur


    i have an x0 short cage derailleur (not type 2) and the 40t cog couldn't work because there was not enough clearance.

    am i doing something wrong?

    i am thinking of buying an x9 type 2 derailleur short cage.

    will that work? has anybody done it?


  2. #2
    Reputation: bigchillcar's Avatar
    Join Date
    Aug 2014
    need to know more..every rd has a certain 'volume' of teeth it can manage, but need to know what you have? 3x, 2x, 1x? and if so, need to know the range of your cassette and the smallest and largest chainring sizes up front. subtract your small cog teeth number from the 40...and add that number to the number you get subtracting the small number of teeth in the front ring from the number of the large ring (assuming 2x or 3x). be like, (40-11) + (44-22) = 51 for example. that system would need a rd that has at least a 51 tooth capacity. start there..
    2011 Trek Mamba 29er 21", SRAM 10-sp X9, X9 type 2 RD, SRAM X7 20(oval)/36 & SRAM X9 2X FD, Shimano XT M771 11-36, M525 hub

  3. #3
    mtbr member
    Reputation: RS VR6's Avatar
    Join Date
    Mar 2007
    If you're riding a HT...the short should be ok...but if you're on a full suspension...I'd get the mid cage just to be on the safe side.

  4. #4
    mtbr member
    Join Date
    Sep 2012
    I ran a 40T cog with an short X0 Type 2 derailleur and it fit fine with proper b-screw adjustment. Mine is a 2013 model and if you have a 2012 or older version of the derailleur, I believe they won't work due to design differences.
    9:Zero:7 Whiteout
    Ibis Ripley LS v2
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