182Best 275/30 R21 tires
11 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Dunlop SP Winter Sport 4D at 88/100.
27.5″
overall diameter
10.8″
section width
21″
rim diameter
733.5
revs per mile
Best 275/30 R21 summer tires
8182
279
575
674
774
870More top-rated 275/30 R21 tires
2
177
272Best 275/30 R21 winter tires
1
188Conversion
275/30 R21 in inches
| Overall diameter | 27.5″ |
| Section width | 10.8″ |
| Rim diameter | 21″ |
| Sidewall height | 83 mm |
| Circumference | 86.4″ |
| Revolutions per mile | 733.5 |
Wheels
What rims fit 275/30 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
7.5″
Ideal
8.5″
Maximum
9.5″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 10.8″ section width (70–90% rule).
Fitted from the factory on rims: 21x9, 21x9.5, 21x10.
Popular comparisons
Sizes often compared with 275/30 R21
Close alternatives — each opens in the tire size calculator.
Sidewall
275/30 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 275 | The first number is the section width — 275 mm, or about 10.8 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 83 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. |