184Best 265/40 R21 tires
48 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Michelin Pilot Sport All Season 4 at 88/100.
29.3″
overall diameter
10.4″
section width
21″
rim diameter
687.2
revs per mile
Best 265/40 R21 summer tires
18184
283
382
487
581
682
779
879
977
1076
1176
6 more rated tires in this size are listed on their brand pages.
Best 265/40 R21 all-season tires
14
188
290
386
484
580
680
778
877
978
1076
12742 more rated tires in this size are listed on their brand pages.
More top-rated 265/40 R21 tires
12
190
288
388
487
586
688
780
879
988
1092
1174
1258Best 265/40 R21 winter tires
4
181
280
376
475Conversion
265/40 R21 in inches
| Overall diameter | 29.3″ |
| Section width | 10.4″ |
| Rim diameter | 21″ |
| Sidewall height | 106 mm |
| Circumference | 92.2″ |
| Revolutions per mile | 687.2 |
Wheels
What rims fit 265/40 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 10.4″ section width (70–90% rule).
Fitted from the factory on rims: 21x8.5, 21x9, 21x9.5, 21x10, 21x10.5, 21x11.
Popular comparisons
Sizes often compared with 265/40 R21
Close alternatives — each opens in the tire size calculator.
Sidewall
265/40 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 265 | The first number is the section width — 265 mm, or about 10.4 inches across the widest part of the tire. |
| 40 | The second number is the aspect ratio: sidewall height as a percentage of width. At 40%, the sidewall is about 106 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. |