Q-factor with 170 and 190mm rear ends- Mtbr.com
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  1. #1
    JYB is offline
    mtbr member
    Join Date
    Nov 2011

    Q-factor with 170 and 190mm rear ends

    The wider Q factor of my 170mm Fatback does not really seem to bother my knees. I've been riding this frame, almost exclusively, for over a year. I've ridden both the Fatback FSA crank and a SRAM x-9 crank. It seems that many companies are switching over to 190mm frames. I'm curious how much greater the Q factor will be on these frames with the cranks that are being used. I'm not convinced that I need a 190 rear. 170 feels like all the space I need, especially for summer trail riding. Can anybody chime in on this? Do your feet feel crazy far apart on a 190mm frame?

  2. #2
    mtbr member
    Reputation: lancelot's Avatar
    Join Date
    May 2006
    Same Q factor as a 170mm frame unless you're running a double offset crank like the Surly OD to increase chain to tire clearance.

    Surly OD (Moonlander) is 213.8
    E Thirteen XCX is 198
    The LPG

  3. #3
    mtbr member
    Reputation: GTR2ebike's Avatar
    Join Date
    May 2010
    Measure your Fatback FSA, I think the Q is larger than a Surly MWOD

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