557 comparisons

All Tire Size Comparisons

Every comparison below is a permanent page with the full arithmetic: overall diameter, section width, sidewall, ground clearance, revolutions per mile, speedometer error at five road speeds and a scale drawing of both tires on the same ground line. They are grouped by the kind of vehicle the sizes are fitted to.

Passenger car

15 to 17 inch wheels on saloons, hatchbacks and small estates. Aspect ratios of 45 to 70, where ride comfort still outranks steering response.

106 comparisons

Performance

17 to 21 inch wheels with 30 to 45 series sidewalls. Section widths climb fast and the tolerance for diameter error narrows, because these fit inside tight arches.

56 comparisons

Crossover and SUV

17 to 21 inch wheels on unibody crossovers. The busiest part of the market and the part where plus sizing between trim levels is most common.

98 comparisons

Light truck

Metric LT sizes on pickups and body-on-frame SUVs. This is where the 3% rule bites hardest, because a two-step size increase usually breaks it.

233 comparisons

Flotation

The inch-based code — 33x12.50R15 — where overall diameter is stated on the sidewall instead of being derived. Off-road sizing lives here.

64 comparisons

Not listed?

The comparison tool takes any two valid size codes, including ones that are not in this catalog. The pages here exist for the pairs people ask about repeatedly.