"Wheelbarrow Tire Wheel Assembly is equipped with a Universal Bearing Kit; Pneumatic tires absorb the unevenness of the surface they are on for a smooth and even ride; The ribbed tread provides superior traction; Each wheelbarrow tire comes with an Universal Bearing Kit, which includes: 2 pcs of 1/4in. spacer, 2 pcs of 1/2in. spacer and 2 pcs of 3/4in. bearings (5/8in. bearing is installed). Tread Pattern: Rib Tire Size: 8"" OD (Outer Diameter): 8 in SW (Tire width): 2.5 in Pneumatic tire 5/8 in. bearing is installed Kits include: 2 pcs of 1/4 in. spacer, 2 pcs of 1/2 in. spacer and 2 pcs of 3/4 in. bearings for 3/4"" and 5/8"" axle diameter Model Number: WB1001. Age Group: adult."