Irrigation tire

A non-directional pneumatic tire for supporting an agricultural irrigation system, comprising:

• first and second sidewalls and a radially outer wall defining an internal inflation chamber;
• a non-directional tread pattern defined on the tire and including a plurality of longitudinal protrusions, each longitudinal protrusion having a protrusion axis substantially parallel to a rotational axis of the tire and each longitudinal protrusion being circumferentially symmetric about its protrusion axis;
• and
• the longitudinal protrusions being arranged in a first row extending from the first sidewall toward and across an equatorial plane of the tire and a second row extending from the second sidewall toward and across the equatorial plane of the tire, the longitudinal protrusions of the first and second rows circumferentially alternating with each other and there being a circumferential spacing between adjacent longitudinal protrusions so that no portion of one longitudinal protrusion extends circumferentially past any portion of an adjacent longitudinal protrusion;
• and
• wherein each longitudinal protrusion includes a contact surface having first and second edges extending from the respective sidewall and defining first and second circumferentially symmetrical bulges on circumferentially opposite sides of the protrusion axis;
• wherein the circumferentially symmetrical bulges each include a convex circular arc shaped bulge portion having a radius of curvature;
• and
• wherein a free end of each longitudinal protrusion is rounded in a convex circular arc shaped end portion having a radius of curvature;
• and wherein the convex circular arc shaped bulge portion of each of the bulges is separated from the convex circular arc shaped end portion of the respective free end by a concave portion of the respective edge.