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  1. #1
    mtbr member
    Join Date
    May 2015

    How flexible is chainline with SRAM 1x11?

    I notice that SRAM supports the use of their new road 1x11 cranksets with the MTB cassettes. In the frame fit specifications they show chainring chainline of 49mm for MTB and 43.7mm for road. All reports I've heard seem to suggest that the road setup works just fine…

    So does it stand to reason that I can go with a much lower chainline than 49mm on SRAM MTB 1x11 (thinking square taper BB here) with good performance as long as I have frame clearance?

  2. #2
    mtbr member
    Join Date
    Jun 2009
    The ideal chainline for a standard MTB Hub / Cassette (135 / 142, not Boost 148) is 45mm.

    You can use chainring spacers, to offset your ring inwards, or as you said, play around with axle lengths if you're using square taper. I don't think its possible to offset Direct mount chainrings.

    You may found chainstay clearance becomes an issue, depending on what size chainring you use, but any offset less than the standard 49mm will give you better performance.
    Lapierre XR29ei, Chris King LB Carbon, XTR 1 X 10
    Planet X Dirty Harry
    Chiner 29er SS

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