When buying or upgrading wheels, have you ever felt confused by the codes stamped on the back of the rim? In fact, these markings aren’t as complicated as they look. Once you know the rules, you can easily read a wheel’s “ID card.” Let’s break it down step by step.
①Common Wheel Parameter Markings
1.Size (Diameter × Width)
•Example: 18x8J
•18: wheel diameter, 18 inches
•8J: wheel width, 8 inches; “J” refers to the flange shape code (common ones include J, JJ, K, etc.).
2.PCD (Pitch Circle Diameter, Bolt Pattern)
•Example: 5×114.3
•5: number of bolt holes
•114.3: diameter of the circle passing through the bolt holes, in millimeters
•This parameter determines whether the wheel fits your vehicle’s hub.
3.ET Value (Offset)
•Example: ET45
•The distance from the wheel mounting surface to the wheel’s centerline, in millimeters.
•Too much or too little offset can affect handling and vehicle stance.
4.Center Bore (CB)
•Example: CB 66.6
•Means the hub bore diameter is 66.6 mm. It must match the vehicle hub; otherwise, hub rings are required.
5.Load Rating & Certifications
•Example: 690kg
•Indicates the maximum load capacity per wheel.
•Reputable wheels usually feature certifications such as JWL, VIA, DOT, confirming strength and safety compliance.
②Steps to Read Wheel Parameters
•Locate the stamped or cast markings on the inside or back of the wheel.
•Check in the order: Size → PCD → ET → CB → Load rating.
•Compare with your vehicle manual or professional fitment data to confirm compatibility.
③Why It’s Important to Understand These Markings
•Avoid Mistakes: Incorrect parameters may cause brake caliper interference or improper bolt fitment.
•Ensure Safety: Wheels with insufficient load capacity can deform or even crack under stress.
•Optimize Modifications: Correct size and offset improve stance, handling, and overall appearance.
Post time: Sep-19-2025
