What does 8.5j mean in wheel rims?

[McNadia]

8.5j refers to the section width of the wheel rim, measured in inches. The 'j' in wheel rim size simply represents the shape and height of the wheel rim flange. The wheel rim is the cylindrical metal component that supports the tire from within, mounted centrally on the axle, also known as the wheel, steel rim, or hubcap. Depending on the characteristics and requirements of different vehicle models, the surface treatment process for wheel rims may vary. Wheel rims can generally be categorized into two types: painted and plated, with plated rims further divided into silver plating, water plating, and pure plating, among others. Methods for maintaining wheel rims include: 1. When the wheel rim is at a high temperature, allow it to cool naturally before cleaning, avoiding the use of cold water; 2. If stubborn tar adheres to the wheel rim, attempt to remove it with a brush.