Enter a tyre code, e.g. 205 / 55 R 16.
0 overall diameter
—
Sidewall height
—
Circumference
—
Revolutions / km
Frequently Asked Questions
How do I read a tyre size?
In a code like 205/55 R16, 205 is the tread width in mm, 55 is the sidewall height as a percentage of the width, and 16 is the wheel rim diameter in inches. Overall diameter = rim + 2 × sidewall height.
Work out a tyre’s overall diameter, sidewall height and circumference from its size code.