179Best 285/30 R21 tires
10 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Atlas Force UHP at 84/100.
27.7″
overall diameter
11.2″
section width
21″
rim diameter
727.2
revs per mile
Best 285/30 R21 summer tires
6179
279
377
574
670More top-rated 285/30 R21 tires
2
184
277Best 285/30 R21 winter tires
1
180Best 285/30 R21 all-season tires
1
184Conversion
285/30 R21 in inches
| Overall diameter | 27.7″ |
| Section width | 11.2″ |
| Rim diameter | 21″ |
| Sidewall height | 86 mm |
| Circumference | 87.1″ |
| Revolutions per mile | 727.2 |
Wheels
What rims fit 285/30 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
8″
Ideal
9″
Maximum
10″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 11.2″ section width (70–90% rule).
Fitted from the factory on rims: 21x9.5, 21x10, 21x10.5.
Popular comparisons
Sizes often compared with 285/30 R21
Close alternatives — each opens in the tire size calculator.
Sidewall
285/30 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 285 | The first number is the section width — 285 mm, or about 11.2 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 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. |