Item 4520173 has must read information.
: This wheel/tire assembly is no longer available. For first time service of 4520173 (LH) or 4520172 (RH), all four assemblies must be replaced with the new design assemblies. Purchase: qty. (2) 1001232260 Right Wheel/Tire Assembly and qty. (2) 1001232261 Left Wheel/Tire Assembly. To determine if wheel/tire has previously been replaced, identify wheel/tire assemblies on machine as follows: Old design assemblies have 20 replaceable tire segments. The new design has one set of holes around the outer sidewall of the tire and does not have replaceable segments.
