How Much Wheel Spacer Do I Need? Sizing Guide for Every Application

Spacer thickness is the most personal choice in the buying process — it depends on your goal, your wheels, your suspension setup, and how aggressive you want the fitment to look. Here's a practical guide to choosing the right size.

Understanding What Spacer Thickness Does

Each millimetre of spacer pushes your wheel outward by one millimetre, changing your effective offset by that amount. A 10mm spacer on a wheel with ET35 offset makes it behave like an ET25 wheel. This affects how much the wheel sits inside or outside the fender lip.

Common Sizes and What They're Used For

• 5–8mm — clearance adjustments. Used to clear brake callipers, correct minor rubbing, or achieve precise flush fitment on wheels that are already close. Not visible as a stance change.
• 10–12mm — subtle stance improvement. Fills the wheel gap without pushing the tyre outside the fender. Works on most suspension setups without rubbing.
• 15mm — the most popular choice for street cars. Noticeably improves stance, fills the arches, and sits flush or slightly proud of the fender on most vehicles.
• 20mm — aggressive street fitment. Typically requires lowering to look correct. May cause minor rubbing at full lock on some vehicles — test on a smooth surface before daily driving.
• 25mm and above — maximum stance. Usually paired with lowered suspension and stretched tyres. Best confirmed with a dry run before daily use.

How to Measure What You Need

The most accurate method: park on flat ground with the wheels straight. Use a straight edge held against the outer face of the tyre. Measure the gap between the straight edge and the inside of the fender lip. That gap is your maximum spacer thickness before the tyre sits flush with the fender. Subtract 2–5mm for clearance buffer.

Suspension Matters

Lowered vehicles can run larger spacers because the reduced suspension travel means less chance of tyre contact at full compression. Stock ride height vehicles with more suspension travel should be more conservative — especially at the rear on vehicles with independent rear suspension.

Our Recommendation

When in doubt, start at 15mm for a noticeable improvement with low risk. You can always go larger later. Going too large and needing to pull fenders or deal with rubbing is a more expensive problem to fix than buying a second set of spacers.