Wheel Offset Fitment Checker
Compare current and proposed wheel widths and offsets to see how the wheel's inner edge and outer position move relative to the hub.
Compare wheel offset
How wheel offset geometry works
Wheel offset is the distance between the wheel's mounting face and its centerline. Changing wheel width at the same time as offset changes both the inner and outer positions of the wheel.
Inner edge position = wheel width ÷ 2 + offset.
Outer edge position = wheel width ÷ 2 − offset.
Reading the result
A positive inner movement means the new wheel edge moves closer to the suspension side. A positive outer movement means the outer edge moves farther outward toward the fender side.
Why wheel diameter is shown separately
Diameter changes can affect brake clearance and tyre selection, but this tool does not use diameter to prove brake compatibility or calculate tyre dimensions. Those questions need their own verification.
What this calculation cannot establish
It does not account for brake-caliper shape, hub geometry, suspension movement, tyre sidewall shape, fender shape, alignment or manufacturer limits. Use it as a geometric first check.
Measure actual clearance
When modifying wheels, measure the vehicle's actual available clearance at the relevant locations rather than assuming every vehicle has the same margin.
FAQs
Does lower offset always mean more poke?
For the same wheel width, lowering positive offset moves the wheel outward. When width also changes, both inner and outer movement must be calculated.
Does this prove the wheel will not rub?
No. Suspension movement, tyre dimensions and body geometry must be checked separately.
Can wheel diameter change brake clearance?
Yes, but diameter alone does not establish brake-caliper clearance.