265/70R16 tyre size
A 265/70R16 tyre is 265 mm (10.4") wide with a sidewall height of 70 % of the width, i.e. 185.5 mm (7.3"), on a 16" (406 mm) rim. Overall diameter is 777.4 mm (30.6"), so the closest inch-style size is 30.6×10.4R16. Static circumference is 2442 mm; the ETRTO rolling circumference is 2371 mm, giving 422 revolutions per km (679 per mile).
Dimensions and rolling diameter
| Section width | 265 mm | 10.43″ |
| Sidewall height | 185.5 mm | 7.30″ |
| Rim diameter | 406.4 mm | 16″ |
| Overall diameter (static, unloaded) | 777.4 mm | 30.61″ |
| Static radius | 388.7 mm | 15.30″ |
| Static circumference (π × D) | 2,442 mm | 96.2″ |
| Rolling circumference (ETRTO 3.05 × D) | 2,371 mm | 93.3″ |
| Effective rolling radius | 377.4 mm | 14.86″ |
| Revs per km (rolling / static) | 422 / 409 | |
| Inch equivalent | 30.6×10.4R16 | |
| Approved rim widths (approx.) | 7.5″–9″ (measuring rim 8″) | |
A 265/70R16 tyre is 265 mm (10.4") wide with a sidewall height of 70 % of the width, i.e. 185.5 mm (7.3"), on a 16" (406 mm) rim. Overall diameter is 777.4 mm (30.6"), so the closest inch-style size is 30.6×10.4R16. Static circumference is 2442 mm; the ETRTO rolling circumference is 2371 mm, giving 422 revolutions per km (679 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.
Buying tyres for your business?
Onyx Tyres supplies workshops, retailers and fleets across Australia at wholesale prices. Open a trade account to see stock and pricing and order online.