315 Tire Size in Inches
A 315 tire is 12.4 inches wide (315 mm ÷ 25.4). Its overall height depends on the aspect ratio and wheel size — the chart below works out every common combination.
Calculated from the size designation · Updated 2026-11-05 · By CarWhere Research
315 tire overall height (inches)
| Aspect | R15 | R16 | R17 | R18 | R19 | R20 | R21 | R22 |
|---|---|---|---|---|---|---|---|---|
| 315/35 | 23.7 | 24.7 | 25.7 | 26.7 | 27.7 | 28.7 | 29.7 | 30.7 |
| 315/40 | 24.9 | 25.9 | 26.9 | 27.9 | 28.9 | 29.9 | 30.9 | 31.9 |
| 315/45 | 26.2 | 27.2 | 28.2 | 29.2 | 30.2 | 31.2 | 32.2 | 33.2 |
| 315/50 | 27.4 | 28.4 | 29.4 | 30.4 | 31.4 | 32.4 | 33.4 | 34.4 |
| 315/55 | 28.6 | 29.6 | 30.6 | 31.6 | 32.6 | 33.6 | 34.6 | 35.6 |
| 315/60 | 29.9 | 30.9 | 31.9 | 32.9 | 33.9 | 34.9 | 35.9 | 36.9 |
| 315/65 | 31.1 | 32.1 | 33.1 | 34.1 | 35.1 | 36.1 | 37.1 | 38.1 |
| 315/70 | 32.4 | 33.4 | 34.4 | 35.4 | 36.4 | 37.4 | 38.4 | 39.4 |
| 315/75 | 33.6 | 34.6 | 35.6 | 36.6 | 37.6 | 38.6 | 39.6 | 40.6 |
Calculated nominal dimensions. Actual measured size varies by tire model and rim width. Linked values are factory sizes on vehicles in our data.
Other widths
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Frequently asked questions
How wide is a 315 tire in inches?
315 mm ÷ 25.4 = 12.4 inches of section width. The tread itself is somewhat narrower than the section width.
How tall is a 315 tire?
It depends on the aspect ratio and wheel size. For example 315/70R17 is about 34.4 in tall and 315/55R20 about 33.6 in — see the chart.