Is your Razor Ground Force go-kart not karting like it should be? Then upgrade your experience with AlveyTech's solid rear wheels! This set includes two solid rear wheels (one with 6900Z bearing) - 4-1/2" D X 2-1/2" W for the Razor Ground Force go-kart. The Ground Force is unique in that only one wheel is a true drive wheel; its rear sibling has a free-wheeling bearing. If your tires aren't giving you the slide you are looking for, our set of two replacement tires are perfect for anyone who wants to take their kart to the next level.Please note that the bearing for the rear wheel is a different size than on the visually similar front wheels, they are not interchangeable. These wheels are exclusively for the Razor Ground Force go-kart.With their hand-built hub and high-quality materials, you can trust that these wheels will hold up. Don't settle for mediocre - grab a set of AlveyTech solid rear wheels!