285/75R16 tyre size
A 285/75R16 tyre is 285 mm (11.2") wide with a sidewall height of 75 % of the width, i.e. 213.8 mm (8.4"), on a 16" (406 mm) rim. Overall diameter is 833.9 mm (32.8"), so the closest inch-style size is 32.8×11.2R16. Static circumference is 2620 mm; the ETRTO rolling circumference is 2543 mm, giving 393 revolutions per km (633 per mile).
Dimensions and rolling diameter
| Section width | 285 mm | 11.22″ |
| Sidewall height | 213.8 mm | 8.42″ |
| Rim diameter | 406.4 mm | 16″ |
| Overall diameter (static, unloaded) | 833.9 mm | 32.83″ |
| Static radius | 417.0 mm | 16.42″ |
| Static circumference (π × D) | 2,620 mm | 103.1″ |
| Rolling circumference (ETRTO 3.05 × D) | 2,543 mm | 100.1″ |
| Effective rolling radius | 404.8 mm | 15.94″ |
| Revs per km (rolling / static) | 393 / 382 | |
| Inch equivalent | 32.8×11.2R16 | |
| Approved rim widths (approx.) | 7.5″–9″ (measuring rim 8″) | |
A 285/75R16 tyre is 285 mm (11.2") wide with a sidewall height of 75 % of the width, i.e. 213.8 mm (8.4"), on a 16" (406 mm) rim. Overall diameter is 833.9 mm (32.8"), so the closest inch-style size is 32.8×11.2R16. Static circumference is 2620 mm; the ETRTO rolling circumference is 2543 mm, giving 393 revolutions per km (633 per mile).
Why two circumferences? The static figure is simple geometry (π × diameter). Under load a radial tyre flattens and rolls about 3 % less per revolution; ETRTO defines the rolling circumference as 3.05 × the nominal diameter, which is what manufacturers quote and what speedo and gearing calculations should use.
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