TIRE & WHEEL LAB
Wheel Offset Calculator
A wider wheel changes both sides of the fit. Compare the wheel’s inner and outer positions before you make a change.
Your results
LIVE CALCULATIONResults will appear here when JavaScript loads. See the worked example below for a reference calculation.
How this calculator works
Inner position = wheel width × 25.4 ÷ 2 + offset. Outer position = wheel width × 25.4 ÷ 2 − offset. Inner clearance change = original inner position − new inner position.
Read the full methodology for definitions, conversion factors and limitations.
Worked example
Moving from 7J ET45 to 8J ET35 places the new inner edge 2.7 mm closer to the suspension and the outer edge 22.7 mm farther outward.
Before you act on the result
Tire and wheel dimensions cannot confirm fitment. Check wheel width, offset, suspension and wheel arch clearance, load and speed ratings, and manufacturer recommendations. Ask a qualified tire professional to verify modifications. Actual tire measurements vary with construction, pressure, load and wear.
Frequently asked questions
Does this include the tire bulge?
No. Results compare nominal wheel bead-seat geometry. Flange thickness, tire section width and sidewall shape are not included.
Are positive offset and positive poke the same?
No. A higher positive offset moves the wheel inward at the same width. More outer protrusion means its outer edge moves farther out.