Cars · trucks · motorcycles · powersports

Tire Size & Wheel Calculator

Choose common tire sizes from dropdowns or select Other / custom size for an unusual application. Compare diameter, circumference, speedometer and ride-height changes, wheel widths and offsets, and decode a four-digit DOT tire date code. All calculations run locally in your browser.

Tire size comparison

Compare Two Tire Sizes

Choose from common passenger-car, SUV/truck, motorcycle and flotation sizes. Custom sizes are still supported.

Current / reference size New / comparison size Speedometer reading

Ready.

What does the size mean?

Tire Size Decoder

Choose a common size or select Other / custom size to decode an unusual tire.

Wheel position

Wheel Width & Offset Comparison

See how a new wheel changes inner clearance and outer poke relative to the current wheel.

Current wheel

Width (in)Offset (mm)

New wheel

Width (in)Offset (mm)

Tire date code

DOT Date Code Decoder

Enter the final four digits of a modern DOT tire identification number.

Keep exploring

For other vehicle research, try the VIN decoder and vehicle recall lookup.

For offline workshop calculators and references on Android, explore Workshop Tools from The Educated Monkey.

Ask WienerDog is a free platform from The Educated Monkey LLC. App pages link to Google Play for current pricing and compatibility.