Abstract: A nonpneumatic tire with generally cylindrical inner and outer members connected by radial wall members mounted on a split rim with tire-retaining flanges and a generally cylindrical tire-supporting surface. The diameter of at least some portions of the rim tire-supporting surface is greater than the diameter of adjacent portions of the inner member of the tire for nonrotatable engagement of the tire by the rim in the mounted condition. The tire may include a layer of compressible material spaced radially inward from a reinforcing ply embedded in the inner member. The tire and rim may also have transversely extending, circumferentially spaced-apart ribs and grooves in meshing engagement to prevent rotation of the tire relative to the rim.

Abstract: A machine used in the renewal of large earthmover type tires, wherein the worn lugs are completely removed from the tire casing and replaced with convolutions of unvulcanized rubber material. The machine is provided with a heated knife blade which is utilized to cut a series of grooves in the unvulcanized rubber material of the tread in accordance with a pattern mounted on the machine. The pattern consists of a cam with a curved outer periphery which is monitored as the cam rotates on the machine. The depth to which the knife cuts into the unvulcanized rubber material as it moves transversely across the tread, is varied in accordance with the periphery of the cam being monitored.