184Best 315/35 R21 tires
21 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Falken Azenis FK460 A/S at 88/100.
29.7″
overall diameter
12.4″
section width
21″
rim diameter
679.5
revs per mile
Best 315/35 R21 summer tires
12184
283
387
481
577
774
873
973
1071
1170
1267More top-rated 315/35 R21 tires
5
188
288
384
486
574Best 315/35 R21 all-season tires
2
274Best 315/35 R21 winter tires
2
185
281Conversion
315/35 R21 in inches
| Overall diameter | 29.7″ |
| Section width | 12.4″ |
| Rim diameter | 21″ |
| Sidewall height | 110 mm |
| Circumference | 93.2″ |
| Revolutions per mile | 679.5 |
Wheels
What rims fit 315/35 R21 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
8.5″
Ideal
10″
Maximum
11″
Rim diameter is fixed at 21″ — only the width varies. Estimated from the 12.4″ section width (70–90% rule).
Fitted from the factory on rims: 21x10.5, 21x11, 21x11.5.
Popular comparisons
Sizes often compared with 315/35 R21
Close alternatives — each opens in the tire size calculator.
Sidewall
315/35 R21 — what does it mean?
| Parameter | Meaning |
|---|---|
| 315 | The first number is the section width — 315 mm, or about 12.4 inches across the widest part of the tire. |
| 35 | The second number is the aspect ratio: sidewall height as a percentage of width. At 35%, the sidewall is about 110 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. |