185/75R20 tire size
185/75R20 in inches: 30.93" overall diameter — 7.28" wide, 5.46" sidewall.
Overall diameter 30.93 in 785.5 mm
Section width 7.28 in 185 mm
Sidewall height 5.46 in 138.75 mm
Revs / mile 652 speedo calibration
Full dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 785.5 mm | 30.93 in |
| Section width | 185 mm | 7.28 in |
| Sidewall height | 138.75 mm | 5.46 in |
| Rim diameter | 508 mm | 20 in |
| Circumference | 2467.7 mm | 97.15 in |
| Revolutions per mile | 652.2 | |
| Aspect ratio | 75% | |
Compare 185/75R20 to similar sizes
Frequently asked questions
What is the overall diameter of a 185/75R20 tire?
A 185/75R20 tire has an overall diameter of 30.93 inches (785.5 mm).
How tall is a 185/75R20 tire?
The sidewall height is 138.75 mm (5.46 inches), and the overall diameter from the ground to the top of the tire is 30.93 inches.
How many revolutions per mile does a 185/75R20 tire make?
A 185/75R20 tire makes approximately 652 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 185/75R20 tire fit?
A 185/75R20 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.