Personal Projects / Garage Tools
Wheel, Tire, & Axle Comparison
See the difference before you change your setup. Compare wheel and tire sizes, axle widths, and stance with downloadable diagrams.
Compare your setups
Enter two combinations to generate scaled tire and axle diagrams.
Wheel & tire sizes
Side views share a scale. The front view aligns both mounting surfaces.
Your tire comparison will appear here.
Axle width & stance
A common vehicle centerline shows the total change, including wheels and spacers.
Your axle comparison will appear here.
Changes below are measured from the same vehicle centerline. More inner clearance means the inner tire edge moves away from the vehicle center.
How the measurements work
Positive offset moves the wheel inward; negative offset moves it outward. A spacer reduces effective offset by its thickness. Backspacing is measured from the wheel mounting face to the inner wheel lip, including the lip allowance above.
Track width = axle WMS width + two spacers − two wheel offsets. Outside tire width = track width + tire section width. The inner tire gap = track width − tire section width. Each setup assumes a centered axle, identical left and right wheels, and straight wheels with zero camber.
Metric tire diameter = wheel diameter × 25.4 + 2 × section width × aspect ratio ÷ 100, in millimeters. Inch sizes use the diameter and section width you enter. Ride-height change is half the diameter change.
These are nominal dimensions. Actual tire diameter and width vary with the tire model, wheel width, pressure, and load. Changing wheel width alone does not change the nominal tire width in this model. The diagrams do not measure available fender, suspension, or brake clearance.
Measurement references: Michelin tire sizes, Curva wheel offset and backspacing, and Tire Rack offset guide.