Rubber Lab Industries — Fitment Tools

Wheel Offset Calculator

See exactly how a wheel swap shifts your fitment relative to the hub — before you buy.

Current Wheel
New Wheel
SUSPENSION SIDE FENDER / STREET SIDE CURRENT NEW HUB MOUNTING PLANE
Dashed outline = current wheel. Solid orange = new wheel. Both measured from the fixed hub mounting plane.
Inner Clearance Change
Outer / Poke Change
Backspacing, Current → New
measured to the inner lip

How Offset Works

Offset is the distance, in millimetres, from a wheel's true centerline to its hub mounting surface. Positive offset pulls the wheel in toward the suspension; negative offset pushes it out toward the fender — the deep-dish, aggressive stance look. Change either the width or the offset and both edges of the wheel move: this tool shows exactly how far, and in which direction, before you order.

For information purposes only. This calculator estimates how clearance shifts based on width and offset alone — it can't account for suspension travel, brake caliper size, fender lip, or tire sidewall profile, so fitment can't be guaranteed from these numbers alone. Use the Year/Make/Model fitment search on any product page, or our Fitment Guarantee, to confirm exact fitment for your vehicle.