Wheel Offset & Backspacing Diagram - Rim Width, Bolt Circle & Fitment Terms

This document is a labeled cross-section diagram of an automotive wheel and tire assembly, illustrating the key dimensional terms used when measuring and fitting wheels. The drawing shows a wheel/tire in side cross-section with callouts identifying: section width and tire width (measured across the tire), fender lip location, overall rim width and rim width (measured across the wheel), caliper height clearance, a dimension of .920, section height (tire sidewall), backspace dimension (from mounting face to inner rim edge), nominal wheel diameter, bolt circle diameter, pilot diameter (the center bore that locates on the hub), positive offset (distance from the wheel centerline to the mounting surface), and static radius (from axle centerline to the ground). A centerline symbol marks the axle center. The diagram contains no text describing a specific vehicle make, model, or year — it is a generic reference for understanding wheel fitment terminology such as backspacing, offset, bolt pattern, and clearance dimensions. A reader can learn how each of these wheel-fitment measurements relates to the others on an actual wheel cross-section, which is useful when selecting aftermarket wheels or verifying clearance to brake calipers and fenders.