This version of the SpaKart comes with 480 x 8 6 ply High Speed Trailer Tires. Not because you will be taking your SpaKart on the road, but because these tires are superior to standard 2 ply ribbed tires on the original SpaKart. Inside the tire is a high quality 3 spoke aluminum wheel with sealed bearings. This package is designed with longevity in mind.