185/75R18 tire size
185/75R18 in inches: 28.93" overall diameter — 7.28" wide, 5.46" sidewall.
Overall diameter 28.93 in 734.7 mm
Section width 7.28 in 185 mm
Sidewall height 5.46 in 138.75 mm
Revs / mile 697 speedo calibration
Full dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 734.7 mm | 28.93 in |
| Section width | 185 mm | 7.28 in |
| Sidewall height | 138.75 mm | 5.46 in |
| Rim diameter | 457.2 mm | 18 in |
| Circumference | 2308.1 mm | 90.87 in |
| Revolutions per mile | 697.3 | |
| Aspect ratio | 75% | |
Compare 185/75R18 to similar sizes
Frequently asked questions
What is the overall diameter of a 185/75R18 tire?
A 185/75R18 tire has an overall diameter of 28.93 inches (734.7 mm).
How tall is a 185/75R18 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 28.93 inches.
How many revolutions per mile does a 185/75R18 tire make?
A 185/75R18 tire makes approximately 697 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 185/75R18 tire fit?
A 185/75R18 tire is designed for a 18-inch rim (457.2 mm).
All dimensions calculated using standard ETRTO formulas. Always confirm fitment with your vehicle's door-placard and a qualified tire professional before purchasing.