153Best 235/30 R21 tires
1 rated tire available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Accelera PHI at 53/100.
26.6″
overall diameter
9.3″
section width
21″
rim diameter
759.6
revs per mile
Best 235/30 R21 summer tires
1153Conversion
235/30 R21 in inches
| Overall diameter | 26.6″ |
| Section width | 9.3″ |
| Rim diameter | 21″ |
| Sidewall height | 71 mm |
| Circumference | 83.4″ |
| Revolutions per mile | 759.6 |
Wheels
What rims fit 235/30 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
6.5″
Ideal
7.5″
Maximum
8.5″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 9.3″ section width (70–90% rule).
Sidewall
235/30 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 235 | The first number is the section width — 235 mm, or about 9.3 inches across the widest part of the tire. |
| 30 | The second number is the aspect ratio: sidewall height as a percentage of width. At 30%, the sidewall is about 71 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. |