The Lawn-Boy brand has long been synonymous with quality, and Lawn-Boy's quality standards begin with Hi- quality components, like this wheel assembly. With a wheel hub made of durable polypropylene, this 8 Inch wheel assembly is a long-lasting and Hi-highly functional replacement for 21 Inch Mulching/Rear Bagging Mowers. This wheel assembly offers a capped tire with a stylish 5-spoke hub, and an aggressive tread to minimize slip. When it comes to reliability, Toro delivers replacement parts designed to the exact engineering specifications of our equipment. For peace of mind, insist on Toro genuine parts.