245/65R17 tyre size
A 245/65R17 tyre is 245 mm (9.6") wide with a sidewall height of 65 % of the width, i.e. 159.3 mm (6.3"), on a 17" (432 mm) rim. Overall diameter is 750.3 mm (29.5"), so the closest inch-style size is 29.5×9.6R17. Static circumference is 2357 mm; the ETRTO rolling circumference is 2288 mm, giving 437 revolutions per km (703 per mile).
Dimensions and rolling diameter
| Section width | 245 mm | 9.65″ |
| Sidewall height | 159.3 mm | 6.27″ |
| Rim diameter | 431.8 mm | 17″ |
| Overall diameter (static, unloaded) | 750.3 mm | 29.54″ |
| Static radius | 375.2 mm | 14.77″ |
| Static circumference (π × D) | 2,357 mm | 92.8″ |
| Rolling circumference (ETRTO 3.05 × D) | 2,288 mm | 90.1″ |
| Effective rolling radius | 364.2 mm | 14.34″ |
| Revs per km (rolling / static) | 437 / 424 | |
| Inch equivalent | 29.5×9.6R17 | |
| Approved rim widths (approx.) | 6.5″–8″ (measuring rim 7″) | |
A 245/65R17 tyre is 245 mm (9.6") wide with a sidewall height of 65 % of the width, i.e. 159.3 mm (6.3"), on a 17" (432 mm) rim. Overall diameter is 750.3 mm (29.5"), so the closest inch-style size is 29.5×9.6R17. Static circumference is 2357 mm; the ETRTO rolling circumference is 2288 mm, giving 437 revolutions per km (703 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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