Wheel rim offset represents the distance from the wheel’s mounting surface to its centerline. It is generally expressed in millimeters and can be positive, negative, or zero. A positive value means the mounting surface is toward the outside of the wheel, while a negative value indicates it is towards the inside. Zero offset means the mounting surface is exactly in line with the wheel’s centerline. Understanding this measurement is crucial when selecting wheels for a vehicle.
Correct determination of this measurement directly impacts vehicle handling, tire clearance, and bearing load. Deviations from the manufacturer’s recommended range can lead to undesirable consequences, including rubbing against suspension components, altered steering characteristics, and accelerated wear on wheel bearings. Historically, this dimension was less critical, but with increasingly complex suspension designs and stringent safety requirements, its accurate assessment has become paramount. Incorrect offset can also negatively affect brake caliper clearance, requiring the use of spacers, which introduce further complications.