162Best 255/25 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 R at 62/100.
26″
overall diameter
10″
section width
21″
rim diameter
775.1
revs per mile
Best 255/25 R21 summer tires
1162Conversion
255/25 R21 in inches
| Overall diameter | 26″ |
| Section width | 10″ |
| Rim diameter | 21″ |
| Sidewall height | 64 mm |
| Circumference | 81.7″ |
| Revolutions per mile | 775.1 |
Wheels
What rims fit 255/25 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
7″
Ideal
8″
Maximum
9″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 10″ section width (70–90% rule).
Sidewall
255/25 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 255 | The first number is the section width — 255 mm, or about 10 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 64 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. |