Tire Height Comparison Chart in Millimeters and Inches

Height chart for 25 common size examples

Rows are sorted by calculated height, from shortest to tallest. Each row is its own reference, so comparison and speed-error columns are omitted. To find the difference between any two rows, enter those sizes in the linked calculator.

Calculated dimensions are nominal, not measured rolling dimensions or vehicle fitment approval.

What tire height measures

Overall height is the diameter across the tire circle through its center. Sidewall height covers just the section between wheel and tread. Two sidewalls contribute to total diameter, one on either side of the wheel. Confusing these dimensions understates a low-profile assembly's height.

A metric tire code mixes units: wheel diameter uses inches, section width uses millimeters, and aspect ratio is a percentage. Treating the printed numbers as one unit misleads. The chart converts wheel diameter before adding the sidewalls, then converts the total to inches.

Read the chart as a geometry reference

Find a complete size code and read across the two height columns. They express the same dimension in different units. Sidewall height explains how much comes from rubber; circumference describes distance around the ideal circle. Revolutions per mile divide one mile by circumference, using full precision before rounding for display.

The examples span passenger-car, SUV and pickup sizes. Their order follows calculated height. Products with identical size codes can have different construction and service descriptions. Read load and speed ratings from the exact product; a bare size code does not supply them.

Compare two heights with the correct reference

Subtract original diameter from candidate diameter and divide by the original to calculate percentage change. Reversing the pair changes the denominator, so the reverse percentage is not an exact negative. Use the calculator's full-precision values for close comparisons; displayed figures have been rounded and can obscure a small difference.

The calculator translates the diameter ratio into estimated actual speed at a chosen indicated speed, assuming calibration to the original size. With a taller tire, the speedometer can read below actual speed; UK/EU rules prohibit under-reading, so check the vehicle manual even below 3%. This calculation cannot measure existing instrument error.

Know the limits of a nominal height

Published diameters can vary between models sharing a size code. Measuring rim width and product design affect that specification. Loaded radius and rolling circumference answer different questions from unloaded diameter: the contact patch deforms under weight. Use measured manufacturer rolling data when that is the quantity you need for your comparison.

These nominal dimensions do not approve fitment. Check the vehicle manual and exact product specifications before selecting a replacement, especially for changes exceeding 3%. Clearance through steering and suspension movement, wheel width, load capacity and inflation requirements need their own checks. Record your original size and compare the exact candidate in the calculator.

Frequently asked questions

Is tire height the same as diameter?

In this chart, yes: height means nominal overall diameter. It does not mean ground clearance, loaded radius or sidewall height. Those dimensions answer different questions and should not be used interchangeably.

Does a larger wheel always make a taller tire?

No. A larger wheel can be combined with a lower sidewall to keep the total height close. Width and aspect ratio must be included in the comparison, not just the number after R.

Why is my manufacturer specification slightly different?

The chart uses an ideal geometric model based on the nominal marking. Product design and measurement conditions can produce different published dimensions. Consult the specification for the exact tire model when the actual product dimension matters.

Can I use the height chart to select a replacement?

Use it to shortlist dimensions. Enter the exact original and proposed sizes in the calculator to see their percentage difference and estimated speed change. Save that pair so you can compare other candidates against the same reference.

Continue your comparison

• Compare your own sizes in the tire size calculator
• How to choose a tire size for bigger wheels