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  1. #1
    mtbr member
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    50 mm rear chainline is simply not possible!

    I've been meaning to do this for quite some time. I finally measured some cassettes to see what the chainline limits were. With 8 and 9 speed cassettes, it is simply not possible to have a chainline greater than 46.5 mm in the rear assuming 135 mm dropouts that are centered with the frame and 1 mm minimum clearance between the frame and cassette lockring (optimistic). It just won't fit!

    So why aren't modern cranksets available with more narrow chainlines for a better match?

  2. #2
    mtbr member
    Reputation: jennasdad's Avatar
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    When I was messing with cranks/bb on my bike I found the rear to be 45.5mm. I think most bb state they give a 148 chainline. Obviously there is some latitude. I found a 108, rather than the recommended 113, square taper bb gave the right front chainline. On my bike I couldn't go much less than a 146 front chainline as the inner sprocket would be touching the swingarm. So the new cranks with outside bearing approaching 150 does make one wonder.

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