One or more wheel apparatuses are provided. The wheel apparatus comprises one or more rigid climbing members that extend to the outer perimeter of the wheel apparatus and are configured to maintain shape and/or relative position over all surfaces the wheel apparatus encounters. The wheel apparatus comprises one or more selective flex zones located adjacent to rigid climbing members, constructed to be passively compressed when the wheel apparatus encounters an obstacle in the path of the wheel apparatus. The wheel apparatus comprises one or more support zones located adjacent to selective flex zones that provide support for smooth rotary motion when not traversing obstacles.

One or more wheel apparatuses are provided. The wheel apparatus comprises one or more rigid climbing members that extend to the outer perimeter of the wheel apparatus and are configured to maintain shape and/or relative position over all surfaces the wheel apparatus encounters. The wheel apparatus comprises one or more selective flex zones located adjacent to rigid climbing members, constructed to be passively compressed when the wheel apparatus encounters an obstacle in the path of the wheel apparatus. The wheel apparatus comprises one or more support zones located adjacent to selective flex zones that provide support for smooth rotary motion when not traversing obstacles.

A wheel assembly is disclosed, the wheel assembly including a rigid wheel and an airless tire mounted on the wheel. A portion of the tire is separated radially from the wheel by a space and is configured to flex inwardly toward the wheel when subject to ground engaging pressure. A spacer is interposed between the wheel and the portion of the tire separated radially from the wheel by a space and is configured to limit the inward flexing of the tire. The spacer may be permanently affixed to the wheel assembly or may be removably attached to the wheel assembly. The spacer may be adjustable between a first size and a second size.

A wheel assembly is disclosed, the wheel assembly including a rigid wheel and an airless tire mounted on the wheel. A portion of the tire is separated radially from the wheel by a space and is configured to flex inwardly toward the wheel when subject to ground engaging pressure. A spacer is interposed between the wheel and the portion of the tire separated radially from the wheel by a space and is configured to limit the inward flexing of the tire. The spacer may be permanently affixed to the wheel assembly or may be removably attached to the wheel assembly. The spacer may be adjustable between a first size and a second size.