• You want a shape that’s 3:1 (depth/width) and a rim width at or over 105% of tyre width.

    #broscience

  • Is that external or internal? If that's the case I need 90mm deep rims for the 30mm width....

  • External.

    If that's the case I need 90mm deep rims for the 30mm width....

    A 1:3 shape is an efficient shape. The mounted, inflated tyre contributes to that shape.

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