315/40R20 tire size
315/40R20 in inches: 29.92" overall diameter — 12.40" wide, 4.96" sidewall.
Overall diameter 29.92 in 760 mm
Section width 12.40 in 315 mm
Sidewall height 4.96 in 126 mm
Revs / mile 674 speedo calibration
Full dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 760 mm | 29.92 in |
| Section width | 315 mm | 12.40 in |
| Sidewall height | 126 mm | 4.96 in |
| Rim diameter | 508 mm | 20 in |
| Circumference | 2387.6 mm | 94.00 in |
| Revolutions per mile | 674.0 | |
| Aspect ratio | 40% | |
Compare 315/40R20 to similar sizes
Frequently asked questions
What is the overall diameter of a 315/40R20 tire?
A 315/40R20 tire has an overall diameter of 29.92 inches (760 mm).
How tall is a 315/40R20 tire?
The sidewall height is 126 mm (4.96 inches), and the overall diameter from the ground to the top of the tire is 29.92 inches.
How many revolutions per mile does a 315/40R20 tire make?
A 315/40R20 tire makes approximately 674 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 315/40R20 tire fit?
A 315/40R20 tire is designed for a 20-inch rim (508 mm).
All dimensions calculated using standard ETRTO formulas. Always confirm fitment with your vehicle's door-placard and a qualified tire professional before purchasing.