Wheel Offset Calculator

Inputs

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Nominal current wheel width in inches.
in
Positive offset means the mounting pad is outward from the wheel centerline.
mm
Nominal new wheel width in inches.
in
Wheel offset before spacer thickness is applied.
mm
Spacer thickness. A spacer reduces the effective offset.
mm

Results

Default result
Edit inputs
Inner clearance change
−7.7 mm
Caution

Inner lip moves closer to suspension.

Positive means more suspension/strut clearance.

Also computed

Outer poke change 17.7 mm

Positive means the outside lip moves outward.

Effective offset 30 mm

New offset minus spacer thickness.

New backspacing 144.3 mm

Current backspacing 136.6 mm

Wheel width change 25.4 mm

Method notes 2 notes
  • Backspacing is approximated from nominal wheel width. Real wheel lips add flange thickness that varies by manufacturer.
  • This geometry check does not verify tire sidewall shape, fender clearance, scrub radius, brake caliper clearance or suspension travel.

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