Best 315/25R21 tires
No tire in this size has a score yet — too few owner reviews and tests. 1 vehicle model uses it from the factory. See the nearest sizes with rated tires.
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Nearest sizes with rated tires
Within 3% of the overall diameter, on the same rim first. Check the sizes approved for your vehicle before you switch.
315/25R21 in inches
| Overall diameter | 27.2″ |
| Section width | 12.4″ |
| Rim diameter | 21″ |
| Sidewall height | 79 mm |
| Circumference | 85.5″ |
| Revolutions per mile | 741.5 |
Revolutions per mile: how many times the tire turns in one mile, the count your speedometer is calibrated to.
What rims fit 315/25R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
The rim diameter is fixed at 21″; only the width can change. Rims are usually 70–90% as wide as the tire’s 12.4″ section width.
Some factory fitments sit outside that range: 21x11.5. Check the rim width approved for your car before you buy.
Cars that use 315/25R21
Fitted from the factory on at least one trim. Models with the most trims and years in this size come first.
315/25R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 315 | The first number is the section width — 315 mm, or about 12.4 inches across the widest part of the tire. |
| 25 | The second number is the aspect ratio: sidewall height as a percentage of width. At 25%, the sidewall is about 79 mm tall. |
| R21 | R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 21-inch wheel. |