235/35R19 tyre size
A 235/35R19 tyre is 235 mm (9.3") wide with a sidewall height of 35 % of the width, i.e. 82.3 mm (3.2"), on a 19" (483 mm) rim. Overall diameter is 647.1 mm (25.5"), so the closest inch-style size is 25.5×9.3R19. Static circumference is 2033 mm; the ETRTO rolling circumference is 1974 mm, giving 507 revolutions per km (815 per mile).
Dimensions and rolling diameter
| Section width | 235 mm | 9.25″ |
| Sidewall height | 82.3 mm | 3.24″ |
| Rim diameter | 482.6 mm | 19″ |
| Overall diameter (static, unloaded) | 647.1 mm | 25.48″ |
| Static radius | 323.5 mm | 12.74″ |
| Static circumference (π × D) | 2,033 mm | 80.0″ |
| Rolling circumference (ETRTO 3.05 × D) | 1,974 mm | 77.7″ |
| Effective rolling radius | 314.1 mm | 12.37″ |
| Revs per km (rolling / static) | 507 / 492 | |
| Inch equivalent | 25.5×9.3R19 | |
| Approved rim widths (approx.) | 8″–9.5″ (measuring rim 8.5″) | |
A 235/35R19 tyre is 235 mm (9.3") wide with a sidewall height of 35 % of the width, i.e. 82.3 mm (3.2"), on a 19" (483 mm) rim. Overall diameter is 647.1 mm (25.5"), so the closest inch-style size is 25.5×9.3R19. Static circumference is 2033 mm; the ETRTO rolling circumference is 1974 mm, giving 507 revolutions per km (815 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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