185/55R15 Tire Size Specifications
Complete dimensional breakdown in inches and millimeters, approved wheel rim widths, vehicle fitments, speedometer error tables, and safe plus-sizing alternatives.
185/55R15 Technical Dimension Table
Standardized measurements computed according to ETRTO & ISO 4000-1 passenger and commercial tire design formulas.
| Specification Property | Imperial (Inches / Miles) | Metric (Millimeters / Kilometers) |
|---|---|---|
| Overall Rolling Diameter | 23.01 in | 584.5 mm |
| Section Width (Cross-section) | 7.28 in | 185 mm |
| Sidewall Cushion Height | 4.01 in | 101.9 mm |
| Circumference (Rolling Distance) | 72.29 in | 1836.2 mm |
| Revolutions per Distance | 904 revs/mile | 562 revs/km |
| Wheel Rim Diameter | 15 in | 381.0 mm |
| Approved Rim Width Range | 5.0" – 6.5" | 127 – 165 mm |
| Measuring / Ideal Rim Width | 5.8 in | 147 mm |
| Aspect Ratio (Profile %) | 55% of section width | |
What 185/55R15 Is Typically Used For
Dimensions in this range are the mainstream touring fitment, tuned for ride comfort, efficiency and year-round availability.
To find the size your specific vehicle takes, check the placard on the driver-side door jamb or your owner's manual. Fitment depends on model year, trim, brake caliper clearance, wheel offset and suspension setup, so the correct size for your car is the one the manufacturer specifies.
Popular Comparisons with 185/55R15
Frequently Asked Questions about 185/55R15
What size is 185/55R15 in inches?
The 185/55R15 tire measures approximately 23.01" in overall diameter, 7.28" in section width (tread/sidewall cross-section), and is mounted on a 15" diameter wheel rim.
What rim width is recommended for 185/55R15?
The approved rim width range for 185/55R15 is 5.0" to 6.5" wide, with an ideal measuring rim width of 5.8" for optimal tread contact and even wear.
What are the closest safe alternative sizes for 185/55R15?
Always verify rolling diameter stays within ±3% of 23.01" to prevent transmission strain and speedometer inaccuracies.
How many revolutions per mile does 185/55R15 make?
A standard 185/55R15 tire rotates approximately 904 revolutions per mile (562 revs per kilometer) at normal inflation pressure and rolling radius.