Tire & Wheel Guides

Practical reference guides for understanding tire sizes, ratings, fitment and wheel geometry.

How to Read Tire Sizes Decode width, aspect ratio, wheel diameter, load index and speed rating. Tire Aspect Ratio Understand sidewall height and how aspect ratio changes tire dimensions. Tire Load Index Look up load capacity and understand load index vs load range. Tire Speed Rating Decode H, T, V, W, Y and other tire speed symbols. Wheel Offset Understand positive, negative and zero offset and calculate wheel-position changes.