Tire Diameter Calculator
Find the exact overall height (outer diameter) in inches or millimeters for any tire size.
Quick Answer
The overall diameter of a 265/70R17 tire is 31.6 inches (803 mm). It has a section width of 10.4 inches and a sidewall height of 7.3 inches.
Common Tire Sizes and Their Diameters
| Tire Size | Diameter (in) | Diameter (mm) | Sidewall Height (in) |
|---|---|---|---|
| 225/65R17 | 28.5" | 724 mm | 5.8" |
| 245/75R16 | 30.5" | 774 mm | 7.2" |
| 265/70R17 | 31.6" | 803 mm | 7.3" |
| 275/55R20 | 31.9" | 810 mm | 6.0" |
| 285/70R17 | 32.7" | 831 mm | 7.9" |
| 315/70R17 | 34.4" | 873 mm | 8.7" |
Formula
Overall Diameter = (2 × Sidewall Height) + Wheel Diameter
- Sidewall Height (in) = (Section Width in mm × (Aspect Ratio / 100)) / 25.4
- Wheel Diameter = rim size in inches (last number in tire code)
- Example: For 265/70R17: Sidewall = (265 × 0.70) / 25.4 = 7.30 in. Diameter = (2 × 7.30) + 17 = 31.6 inches