265/75R16 tyre size
A 265/75R16 tyre is 265 mm (10.4") wide with a sidewall height of 75 % of the width, i.e. 198.8 mm (7.8"), on a 16" (406 mm) rim. Overall diameter is 803.9 mm (31.6"), so the closest inch-style size is 31.6×10.4R16. Static circumference is 2526 mm; the ETRTO rolling circumference is 2452 mm, giving 408 revolutions per km (656 per mile).
Dimensions and rolling diameter
| Section width | 265 mm | 10.43″ |
| Sidewall height | 198.8 mm | 7.82″ |
| Rim diameter | 406.4 mm | 16″ |
| Overall diameter (static, unloaded) | 803.9 mm | 31.65″ |
| Static radius | 402.0 mm | 15.82″ |
| Static circumference (π × D) | 2,526 mm | 99.4″ |
| Rolling circumference (ETRTO 3.05 × D) | 2,452 mm | 96.5″ |
| Effective rolling radius | 390.2 mm | 15.36″ |
| Revs per km (rolling / static) | 408 / 396 | |
| Inch equivalent | 31.6×10.4R16 | |
| Approved rim widths (approx.) | 7″–8.5″ (measuring rim 7.5″) | |
A 265/75R16 tyre is 265 mm (10.4") wide with a sidewall height of 75 % of the width, i.e. 198.8 mm (7.8"), on a 16" (406 mm) rim. Overall diameter is 803.9 mm (31.6"), so the closest inch-style size is 31.6×10.4R16. Static circumference is 2526 mm; the ETRTO rolling circumference is 2452 mm, giving 408 revolutions per km (656 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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