Wheel offset is the number most people ignore when buying aftermarket wheels — and getting it wrong causes rubbing, handling problems, and accelerated bearing wear. Here is what it means in plain English.

What Wheel Offset Actually Means

Wheel offset is the distance in millimetres between the wheel's mounting face — the flat surface that bolts to your hub — and the centreline of the wheel. It is stamped on every wheel and written as ET followed by a number — ET45, ET38, ET20 etc.

Positive offset (ET45, ET38) — the mounting face is toward the outside of the wheel. The wheel sits further inside the wheel arch. Most modern front-wheel-drive cars use high positive offsets.

Zero offset (ET0) — the mounting face is exactly at the wheel's centreline.

Negative offset (ET-10, ET-20) — the mounting face is toward the inside of the wheel. The wheel pushes outward, sitting more flush or protruding from the arch. Used for aggressive fitments and off-road trucks.

What Happens If You Get It Wrong

Safe Offset Range for Common Cars

Honda Civic 10th gen (2016-2021) — factory offset is ET45. Safe aftermarket range is ET38-ET48. Going below ET35 risks outer arch rubbing especially on lowered cars.

Chevy Silverado 1500 — factory offset varies by trim. Most aftermarket truck wheels run ET0 to ET24. Going significantly negative creates suspension geometry changes that accelerate ball joint wear.

Ford F150 — similar to Silverado. ET0 to ET24 is the typical aftermarket range.

Wheel Spacers — The Offset Adjustment Tool

Wheel spacers push the wheel outward — effectively reducing the offset. A 15mm spacer on an ET45 wheel gives the same position as an ET30 wheel. Spacers are useful for achieving a flush fitment on stock or near-stock offset wheels without buying new wheels.

Quality spacers with hub-centric design and proper hardware are safe. Cheap spacers with poor tolerances or incorrect hub bore are not — they introduce vibration and in extreme cases can cause wheel separation.