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.