Wheel Offset & Fitment Calculator

See how a new wheel's width and offset (ET) change inner clearance and outer poke.

Current wheel
New wheel

Offset, backspacing and poke

Offset (ET) is the distance from the wheel's centreline to its mounting face. A higher offset pulls the wheel inward; a lower offset pushes it out. Backspacing is the distance from the mounting face to the inner rim edge. This calculator uses the nominal rim width; the actual rim flange adds roughly 12–13 mm (½ in) to the overall width. Bolt pattern (PCD) and centre bore must also match your hub, or use proper hub-centric rings.

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