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A browser-based wheel offset & clearance calculator tool. No data sent to server.

📘 How to Use

  1. Enter your current wheel's rim width (J) and offset (mm).
  2. Enter your new wheel's rim width (J) and offset (mm).
  3. Check the calculated outer extension and inner clearance results.
  4. Analyze the visual diagram to compare the old and new fitment.

Wheel Offset & Clearance Calculator

tire_repair Current Wheel

add_circle New Wheel

Outer Extension
0.0 mm
Inner Clearance
0.0 mm
← Outer (Fender) Inner (Suspension) → Hub Surface

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Article

Wheel Offset Calculator｜Simulate Fitment, Clearance & Stance

This tool helps you calculate and visualize how a new set of wheels will fit on your vehicle compared to your current setup. Instantly determine if the new wheels will poke out too far, causing fender rubbing, or sit too close to the suspension. It's essential for any car enthusiast planning a wheel upgrade.

💡 Tool Overview

  • Fitment Simulation: Calculates the exact change in wheel position, showing how much further the wheel will extend outwards (poke) and how much closer it will be to the inner suspension components.
  • Visual Comparison: An interactive diagram displays your current and new wheel setups side-by-side, making it easy to understand the changes in positioning relative to the vehicle's hub.
  • Clearance Warnings: The results provide immediate feedback on potential risks. A positive "Outer Extension" value warns of possible fender interference, while a positive "Inner Clearance" value indicates reduced space near suspension and brake parts.
  • Real-Time Results: The calculations and diagram update instantly as you input the specifications, allowing for quick and easy experimentation with different wheel sizes.

🧐 Frequently Asked Questions

Q. What do the result values mean?

A. * Outer Extension: This shows how much the outer face of the new wheel will stick out (positive value) or retract in (negative value) compared to the old wheel. A large positive number increases the risk of the tire rubbing on the fender. * Inner Clearance: This shows how much closer the inner edge of the new wheel will be to the suspension (positive value) or how much further away it will move (negative value). A large positive number means you have less space, increasing the risk of the wheel hitting struts, control arms, or brake calipers.

Q. What is wheel offset?

A. Offset is the distance in millimeters from the wheel's hub-mounting surface to the centerline of the wheel. * Positive Offset (+): The mounting surface is towards the front (outer face) of the wheel. This is common on most modern front-wheel-drive and all-wheel-drive cars. * Negative Offset (-): The mounting surface is towards the back (inner edge) of the wheel, creating a "deep dish" look. * Zero Offset (0): The mounting surface is perfectly aligned with the centerline of the wheel.

📚 Wheel Fitment: Beyond the Numbers

Changing your wheel width and offset does more than just alter your car's appearance; it affects its performance and handling dynamics. A wider track width (achieved by using lower offset wheels or wider rims) can increase stability in corners. However, it also alters the suspension geometry, specifically the "scrub radius." This can affect steering feel, feedback, and tire wear. Furthermore, pushing the wheels further out increases the leverage on the wheel bearings, potentially leading to premature wear. This calculator provides the critical first step in an upgrade—ensuring physical fitment—but always consider these performance implications before making a final decision.