• NHSTA Wheel & Tire Product Information: online index of wheel & tire product information
• NHTSA Tire Safety: National Highway Traffic Safety Administration's tire safety tips
• Measuring Your Wheels: instructions and diagrams explaining how to properly measure backspacing for wheels
• Consumer Guide: helping you make the right choice for all your automotive needs

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HOW TO MEASURE BACKSPACING

Here are some diagrams outlining how to measure offset and bolt pattern when replacing your wheels.

HOW TO MEASURE BOLT PATTERN