155/55R18 tire size
155/55R18 in inches: 24.71" overall diameter — 6.10" wide, 3.36" sidewall.
Overall diameter 24.71 in 627.7 mm
Section width 6.10 in 155 mm
Sidewall height 3.36 in 85.25 mm
Revs / mile 816 speedo calibration
Full dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 627.7 mm | 24.71 in |
| Section width | 155 mm | 6.10 in |
| Sidewall height | 85.25 mm | 3.36 in |
| Rim diameter | 457.2 mm | 18 in |
| Circumference | 1972.0 mm | 77.64 in |
| Revolutions per mile | 816.1 | |
| Aspect ratio | 55% | |
Compare 155/55R18 to similar sizes
Frequently asked questions
What is the overall diameter of a 155/55R18 tire?
A 155/55R18 tire has an overall diameter of 24.71 inches (627.7 mm).
How tall is a 155/55R18 tire?
The sidewall height is 85.25 mm (3.36 inches), and the overall diameter from the ground to the top of the tire is 24.71 inches.
How many revolutions per mile does a 155/55R18 tire make?
A 155/55R18 tire makes approximately 816 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 155/55R18 tire fit?
A 155/55R18 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.