215/60R16 tyre size
A 215/60R16 tyre is 215 mm (8.5") wide with a sidewall height of 60 % of the width, i.e. 129.0 mm (5.1"), on a 16" (406 mm) rim. Overall diameter is 664.4 mm (26.2"), so the closest inch-style size is 26.2×8.5R16. Static circumference is 2087 mm; the ETRTO rolling circumference is 2026 mm, giving 493 revolutions per km (794 per mile).
Dimensions and rolling diameter
| Section width | 215 mm | 8.46″ |
| Sidewall height | 129.0 mm | 5.08″ |
| Rim diameter | 406.4 mm | 16″ |
| Overall diameter (static, unloaded) | 664.4 mm | 26.16″ |
| Static radius | 332.2 mm | 13.08″ |
| Static circumference (π × D) | 2,087 mm | 82.2″ |
| Rolling circumference (ETRTO 3.05 × D) | 2,026 mm | 79.8″ |
| Effective rolling radius | 322.5 mm | 12.70″ |
| Revs per km (rolling / static) | 493 / 479 | |
| Inch equivalent | 26.2×8.5R16 | |
| Approved rim widths (approx.) | 6″–7.5″ (measuring rim 6.5″) | |
A 215/60R16 tyre is 215 mm (8.5") wide with a sidewall height of 60 % of the width, i.e. 129.0 mm (5.1"), on a 16" (406 mm) rim. Overall diameter is 664.4 mm (26.2"), so the closest inch-style size is 26.2×8.5R16. Static circumference is 2087 mm; the ETRTO rolling circumference is 2026 mm, giving 493 revolutions per km (794 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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