177Best 345/25 R21 tires
1 rated tire available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Pirelli P Zero R at 77/100.
27.8″
overall diameter
13.6″
section width
21″
rim diameter
725.7
revs per mile
More top-rated 345/25 R21 tires
1177Conversion
345/25 R21 in inches
| Overall diameter | 27.8″ |
| Section width | 13.6″ |
| Rim diameter | 21″ |
| Sidewall height | 86 mm |
| Circumference | 87.3″ |
| Revolutions per mile | 725.7 |
Wheels
What rims fit 345/25 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
9.5″
Ideal
11″
Maximum
12″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 13.6″ section width (70–90% rule).
Fitted from the factory on rims: 21x13.
Sidewall
345/25 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 345 | The first number is the section width — 345 mm, or about 13.6 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 86 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. |