Abstract: A tread for a tire includes a first circumferential groove extending in a circumferential direction entirely encircling the tire, the first circumferential groove having two sidewalls extending radially outward from an annular base, each sidewall defining a plane perpendicular to a rotational axis of the tire, and a first groove rib projecting radially outward from the annular base of the first circumferential groove, the first groove rib extending circumferentially and entirely encircling the tire, the first groove rib having two sidewalls extending radially outward from the annular base of the first circumferential groove to a radially outermost annular surface of the first groove rib, each sidewall of the first groove rib defining a plane perpendicular to a rotational axis of the tire, the sidewalls of the first circumferential groove extending circumferentially and parallel to the sidewalls of the first groove rib, the first groove rib having a radial height less than a radial height of the first circumfe