Best 325/35 R21 tires
We don't have rated tires listed in this size yet — the conversion, rim fitment and comparisons below still apply.
30″
overall diameter
12.8″
section width
21″
rim diameter
673.2
revs per mile
Conversion
325/35 R21 in inches
| Overall diameter | 30″ |
| Section width | 12.8″ |
| Rim diameter | 21″ |
| Sidewall height | 114 mm |
| Circumference | 94.1″ |
| Revolutions per mile | 673.2 |
Wheels
What rims fit 325/35 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).
Fitted from the factory on rims: 21x10.5.
Sidewall
325/35 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. |
| 35 | The second number is the aspect ratio: sidewall height as a percentage of width. At 35%, the sidewall is about 114 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. |