305/40R15 tire size
305/40R15 in inches: 24.61" overall diameter — 12.01" wide, 4.80" sidewall.
Overall diameter 24.61 in 625 mm
Section width 12.01 in 305 mm
Sidewall height 4.80 in 122 mm
Revs / mile 820 speedo calibration
Full dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 625 mm | 24.61 in |
| Section width | 305 mm | 12.01 in |
| Sidewall height | 122 mm | 4.80 in |
| Rim diameter | 381 mm | 15 in |
| Circumference | 1963.5 mm | 77.30 in |
| Revolutions per mile | 819.6 | |
| Aspect ratio | 40% | |
Compare 305/40R15 to similar sizes
Frequently asked questions
What is the overall diameter of a 305/40R15 tire?
A 305/40R15 tire has an overall diameter of 24.61 inches (625 mm).
How tall is a 305/40R15 tire?
The sidewall height is 122 mm (4.80 inches), and the overall diameter from the ground to the top of the tire is 24.61 inches.
How many revolutions per mile does a 305/40R15 tire make?
A 305/40R15 tire makes approximately 820 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 305/40R15 tire fit?
A 305/40R15 tire is designed for a 15-inch rim (381 mm).
All dimensions calculated using standard ETRTO formulas. Always confirm fitment with your vehicle's door-placard and a qualified tire professional before purchasing.