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  1. #1
    dmo is offline
    mtbr member
    Reputation: dmo's Avatar
    Join Date
    Apr 2006

    Changing q factor

    I got a new frame that takes a 168 q factor crank but the sram gxp crankset I have from my old bike is 156 q factor. I tried the crank in and it does clear the chainstays but it's close. Is that ok or is there a way to change the q factor without having to buy a whole new crankset?

  2. #2
    mtbr member
    Join Date
    Nov 2011
    I thought only the BB30 cranks have different Q factors? You've already got the crank, all you can do it try it - you don't need much room.

  3. #3
    LE Reporter
    Reputation: Markus B.'s Avatar
    Join Date
    Dec 2004
    I would suggest you provide more details, like: Is your issue only with chain stay / crank arm clearance or also chain stay / chain ring clearance? Is chain stay / crank arm clearance equally close on drive and non drive side? If not, are there any spacers between the BB cups and the frame? Maybe some close up pictures could help assess whether "close" is just close or too close.

    With Shimano HollowTech crank sets there is some room to adjust the Q factor due to the clamp-on design of the non drive side crank arm, but not with GXP as - according to my understanding - on the non drive side the inner race of the bearing sits firmly between crank arm and the "shoulder" of the spindle. However under favourite circumstances maybe playing with BB cup spacers could help.

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