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  1. #1
    mtbr member
    Join Date
    Dec 2010

    Gearing Ratio for 2x9?

    I have already converted one bike to a 1X9 setup. I was wanting to swap out the big ring on my 3x10 for a bashguard but to get more out of the 2 ring setup I was thinking of going 24, 36 on the front. Has anyone tried this ratio? Do they make a 26 tooth granny ring? What are my options for going this route as far as shifting and such?

  2. #2
    Reputation: mimi1885's Avatar
    Join Date
    Aug 2006
    It depends on the BCD and what kind of crank you have. I've seen 24 and 26 granny. I love my 22/36 set up.

  3. #3
    Mountain Man Dan
    Reputation: ProjectDan35's Avatar
    Join Date
    Jul 2010
    I also run 22-36-bash on my double specific crankset. 36t is nice.

  4. #4
    Reputation: robdeanhove's Avatar
    Join Date
    Dec 2005
    I run 24/36 on my full sus and 26/38 on my hardtail (where I can stand up and mash the climbs bob free). I found TA do chinook chainrings in all BCDs in those sizes. Oh, and my bikes are 29er, so that gearing will be easier on a 26" bike.

    I've found keeping the gap at 12T at the front keeps the shifting great, 14T will make it worse shifting up under power.

  5. #5
    Reputation: doccoraje's Avatar
    Join Date
    Jan 2004
    I went 2x9 a couple of years ago, first with an Extralite Gara 42-28 which ended being too much for my weak legs and the trails I ride, after that I changed to TA Chinook's 40-26, working OK paired with an 11-34 cassette, now using the same gear ratio, but with Carbon-Ti chainrings.

  6. #6
    Reputation: derby's Avatar
    Join Date
    Jan 2004
    It depends on your speed limits climbing, traversing, and downhill. A 10 to 12 tooth gap is an easy shift and usually appropriate.

    Back when there were only rigid frames I used a 42/26 plus bash. Now much older and slower, I never need more than 22/32/bash off road.

    Edit: that 42/26 was with a 28/12 7-speed cog set.
    Last edited by derby; 07-29-2011 at 08:00 AM.

  7. #7
    mtbr member
    Reputation: Nater's Avatar
    Join Date
    Jan 2004
    24/36 with an 11-34 tooth works well for me on my dual suspension 29er.

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