192Best 275/45 R21 tires
58 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Goodyear Assurance Maxlife2 at 92/100.
30.7″
overall diameter
10.8″
section width
21″
rim diameter
656
revs per mile
More top-rated 275/45 R21 tires
20192
293
388
490
588
687
793
885
984
1087
1184
12838 more rated tires in this size are listed on their brand pages.
Best 275/45 R21 summer tires
18
184
283
387
481
581
681
780
880
981
1082
1177
12766 more rated tires in this size are listed on their brand pages.
Best 275/45 R21 all-season tires
14
188
286
384
480
578
677
778
882
1174
12622 more rated tires in this size are listed on their brand pages.
Best 275/45 R21 winter tires
4
185
281
378
475Best 275/45 R21 all-terrain tires
2
189
286Conversion
275/45 R21 in inches
| Overall diameter | 30.7″ |
| Section width | 10.8″ |
| Rim diameter | 21″ |
| Sidewall height | 124 mm |
| Circumference | 96.6″ |
| Revolutions per mile | 656 |
Wheels
What rims fit 275/45 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: 21x8.5, 21x9, 21x9.5, 21x10, 21x11.
Popular comparisons
Sizes often compared with 275/45 R21
Close alternatives — each opens in the tire size calculator.
Sidewall
275/45 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. |
| 45 | The second number is the aspect ratio: sidewall height as a percentage of width. At 45%, the sidewall is about 124 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. |