The wheel rim size of 18 inches by 8.5 inches with a 5x112 bolt pattern, an ET (offset) of 30mm, and a center bore (CB) of 73.1mm. These details are important for determining the compatibility of the wheels with a vehicle. Here’s a breakdown of the key specifications:
18 x 8.5 Inches: The wheel has a diameter of 18 inches and a width of 8.5 inches.                                                                            
5x114.3/5x112 Bolt Pattern: This means the wheel has 5 bolt holes, and the bolt circle diameter is 114.3mm or 112mm. It’s a common bolt pattern for many vehicles, particularly Japanese, Korean, and some European brands.                                                                                  
ET 30 (Offset): This means the distance from the wheel's mounting surface to its centerline is 30mm. A positive offset (ET 30) indicates the mounting surface is closer to the outside edge of the wheel.                                                                                           
73.1mm Center Bore (CB): The diameter of the central hole of the wheel, which must match the vehicle's hub size for proper fitting.