235/65R17 tyre size
A 235/65R17 tyre is 235 mm (9.3") wide with a sidewall height of 65 % of the width, i.e. 152.8 mm (6.0"), on a 17" (432 mm) rim. Overall diameter is 737.3 mm (29.0"), so the closest inch-style size is 29×9.3R17. Static circumference is 2316 mm; the ETRTO rolling circumference is 2249 mm, giving 445 revolutions per km (716 per mile).
Dimensions and rolling diameter
| Section width | 235 mm | 9.25″ |
| Sidewall height | 152.8 mm | 6.01″ |
| Rim diameter | 431.8 mm | 17″ |
| Overall diameter (static, unloaded) | 737.3 mm | 29.03″ |
| Static radius | 368.7 mm | 14.51″ |
| Static circumference (π × D) | 2,316 mm | 91.2″ |
| Rolling circumference (ETRTO 3.05 × D) | 2,249 mm | 88.5″ |
| Effective rolling radius | 357.9 mm | 14.09″ |
| Revs per km (rolling / static) | 445 / 432 | |
| Inch equivalent | 29×9.3R17 | |
| Approved rim widths (approx.) | 6.5″–8″ (measuring rim 7″) | |
A 235/65R17 tyre is 235 mm (9.3") wide with a sidewall height of 65 % of the width, i.e. 152.8 mm (6.0"), on a 17" (432 mm) rim. Overall diameter is 737.3 mm (29.0"), so the closest inch-style size is 29×9.3R17. Static circumference is 2316 mm; the ETRTO rolling circumference is 2249 mm, giving 445 revolutions per km (716 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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