Tire size converter
Enter a metric tire size and read its diameter, section width, sidewall and revolutions per mile in both inches and millimetres.
What it measures
34.07 in
- Overall diameter
- 34.07 in / 865.5 mm
- Section width
- 10.83 in / 275 mm
- Sidewall height
- 7.04 in / 178.8 mm
- Circumference
- 107.05 in / 2,719.0 mm
- Revolutions per mile
- 591.9 per mile / 367.8 per km
Popular sizes
| Size | Overall diameter | Section width |
|---|---|---|
| 275/65R20 in inches | 34.07 | 10.83 |
| 275/60R20 tire size | 32.99 | 10.83 |
| 275/70R18 in inches | 33.16 | 10.83 |
| 285/70R17 tire size | 32.71 | 11.22 |
| the 315/70R17 size page | 34.36 | 12.40 |
| 265/70R17 | 31.61 | 10.43 |
| 275/55R20 tire size | 31.91 | 10.83 |
| the 305/55R20 size page | 33.21 | 12.01 |
| 275/65R18 dimensions | 32.07 | 10.83 |
| 285/60R20 dimensions | 33.46 | 11.22 |
| how big 285/75R16 is | 32.83 | 11.22 |
| 295/65R20 in inches | 35.10 | 11.61 |
| 285/55R20 | 32.34 | 11.22 |
| how big 235/75R15 is | 28.88 | 9.25 |
| 255/75R17 | 32.06 | 10.04 |
How this is worked out
sidewall height in millimetres = section width × aspect ratio ÷ 100
overall diameter in inches = wheel diameter + (section width × aspect ratio × 2) ÷ 2540
section width in inches = section width in millimetres ÷ 25.4
circumference in inches = π × overall diameter
revolutions per mile = 63360 ÷ circumference in inches
The divisor is 2540, not the 2550 some converters publish. Two sidewalls in inches are 2 × width × aspect ÷ (100 × 25.4), and the rounding costs about 0.07 inches at 34 inches.