For the very first time, Martin Wheel is offering Universal Fit Wheelbarrow Wheels, available in Flat Free or pneumatic tires. Our lightweight pneumatic rib tire is mounted on a one-piece welded steel wheel with an industrial ball bearing hub. Comes complete with universal hub spacers to fit the most popular lawn carts and wheelbarrows. This general purpose pneumatic wheel is used on most 4 cu/ft wheelbarrows. 5/8-In. Ball Bearing