Sidecut Radius Sidecut refers to the curvature along the side of a ski.  Manufacturers craft sidecut into their skis by designing the tips and tails to be wider than the ski's center.   The amount of sidecut a ski has is designated as its radius.  The more sidecut a ski possesses,  the smaller it's radius designation, and the sharper the turn it will be able to carve when tipped on edge.