While wheels are, in large, used for aesthetic purposes, understanding the sizing is critical to ensure safety and security on the road. Below is a wheel diagram to help us visualize and explain the different components of a wheel. Wheel Diagram Let’s look at an example to help define the different aspects of a wheel size.  18x8 5x112 ET40 Wheel Diameter (18): As shown on the diagram, wheel diameter is the distance measured across the wheel face from bead seat...

How to Read Tire Sizing Tire Size Diagram Vehicle Type (P): This letter indicates the type of vehicle. “P” stands for passenger car. There are two different metrics for vehicle type. The P-metric and the Euro-metric. The P-metric is for vehicles made to carry passengers, hence, “passenger car.” This includes cars, SUVs, or light-duty pickup trucks. The Euro-metric is not much different. In simple terms, Euro-metric tires are made to withstand a higher load capacity. Generally, one can use Euro-Metric...