Wheel Offset Calculator

Compare wheel offset (ET) and width side by side — see how much your new wheels will poke or tuck, change in inner suspension clearance, and ET ↔ backspacing conversion. Then book a fitment check with AutoCraze.

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Existing wheel

Wheel width (in)

Offset

Backspacing: 5.27"

New wheel

Wheel width (in)

Offset

Backspacing: 5.04"

Measurement

Existing

New

Difference

Offset (ET)

Backspacing

Wheel width

Outer edge vs hub face

Inner edge vs hub face

Poke change (outer edge)

0 mm

Inner clearance change

0 mm

Calculating... Set values above and press Calculate.

Quick converter - ET / Backspacing

Wheel width (in)

Offset (ET, mm)

Backspacing (in)

Have AutoCraze verify clearance for your build

Fitment is part maths, part experience. Send us your stock and target wheel specs and we'll confirm whether you'll need spacers, guard rolling or different offset — and put together a quote on wheels that suit your car.

✓ Got it — your enquiry is on its way.

An AutoCraze fitment expert will be in touch shortly. Call us on 1300 092 727.

What is wheel offset?

Offset (ET) is the distance, in millimetres, from the wheel's hub mounting face to its true centreline.

Positive ET = mounting face outboard of centreline (tucks into guard). Negative ET = mounting face inboard (pokes out).

Backspacing: BS (in) = (Width / 2) + 0.5 + (ET / 25.4). Stay within +/-5 mm of factory ET; beyond +/-10 mm may need VSB 14 LS9 signoff.

Wheel Offset Calculator — Calculate PCD, ET & Poke Instantly