Our commercial wheel 22.5 x 8.25 Truck/Bus Wheel is made of forged aluminum which allows the wheel to be lighter than steel wheels and has a metallic silver to fight erosion. Specification: Diameter: 22.5 in Width: 8.25 in Rim Material: Aviation-grade Forged Aluminum (6061) Bolt Pattern (PCD): 10x285.75mm Bore (CB): 220.1mm Max Load: 7400 LB Outset: 143mm