176Best 325/25 R21 tires
2 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Continental SportContact 6 at 76/100.
27.4″
overall diameter
12.8″
section width
21″
rim diameter
736.1
revs per mile
Best 325/25 R21 summer tires
2176
270Conversion
325/25 R21 in inches
| Overall diameter | 27.4″ |
| Section width | 12.8″ |
| Rim diameter | 21″ |
| Sidewall height | 81 mm |
| Circumference | 86.1″ |
| Revolutions per mile | 736.1 |
Wheels
What rims fit 325/25 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
9″
Ideal
10″
Maximum
11.5″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 12.8″ section width (70–90% rule).
Popular comparisons
Sizes often compared with 325/25 R21
Close alternatives — each opens in the tire size calculator.
Sidewall
325/25 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 325 | The first number is the section width — 325 mm, or about 12.8 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 81 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. |