Wheel Spacer Calculator
Adding a spacer subtracts from your effective offset. Use this to see where your wheel will sit and what hardware you'll need.
How it works
Effective offset = current offset − spacer thickness. A 5mm spacer on a +20 offset wheel gives you an effective +15 offset (the wheel sits 5mm further outboard).
Below 3mm: slip-on territory — hubcentric strongly recommended to keep the wheel centered. At 5mm and above: factory studs are usually too short — extended studs (or bolt-on spacers with their own studs) become mandatory. At 15mm and above: only bolt-on hubcentric spacers are safe; slip-on at this thickness is not.
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Disclaimer
Hubcentric spacers required. Extended studs required above 5mm. Check local laws. These outputs are approximations — always physically test-fit components before final installation.