Wheel Offset Calculator (Embed)

Stock setup

Width (in)

Offset (mm)

New setup

Width (in)

Offset (mm)

Spacer (optional)

Convert between offset (mm) and backspace (in) for any single wheel. Wheel manufacturers spec offset in mm; many shops measure backspace in inches.

Width (in)

Offset (mm)

Backspace (in)

Edit any field — the others recompute live. Formula: backspace = (width / 2) + (offset / 25.4)

Poke

+0.59 in

+15.0 mm from fender

Tuck

-0.59 in

-15.0 mm to suspension

New backspace

4.79 in

OK fitment

Your new setup pokes 0.59 in further from the fender and tucks 0.59 in less toward suspension. Confirm fender-lip clearance at full lock with weight in the trunk before driving.

Top-down view (looking down at the wheel from above) Stock New

Reference values only. Always verify clearance before driving — fender lip, suspension travel, brake caliper geometry, and tire sidewall flex vary by vehicle. Spacers above 1.5" should be hub-centric and torque-checked at 50 miles. Mike Reeves is an ASE Master Technician but not your fitter.