185/55R15 tire size in inches
A 185/55R15 tire measures
23.0" tall × 7.3" wide
4.01" sidewall on a 15" wheel. 876 revolutions per mile.
185/55R15 means a tire 185 mm wide, with sidewalls 55% as tall as the tire is wide (102 mm), radial construction (R), for a 15 inch wheel.
185/55R15 specs
| Overall diameter (height) | 23.01 inches (585 mm) |
|---|---|
| Section width | 7.28 inches (185 mm) |
| Sidewall height | 4.01 inches (102 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 72.3 inches (1,836 mm) |
| Revolutions per mile | 876 |
| Revolutions per kilometer | 545 |
| Approximate rim width | 5.0" to 6.5" |
| In inches (flotation style) | 23.0x7.3R15 |
| Aspect ratio | 55% |
Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.
Sizes that can replace 185/55R15 on a 15" wheel
These 15" sizes are within 3% of 185/55R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/45R15 | 22.97" | 8.86" | −0.2% | 59.9 mph | Compare |
| 205/50R15 | 23.07" | 8.07" | +0.3% | 60.2 mph | Compare |
| 165/60R15 | 22.80" | 6.50" | −0.9% | 59.4 mph | Compare |
| 175/60R15 | 23.27" | 6.89" | +1.1% | 60.7 mph | Compare |
| 235/45R15 | 23.33" | 9.25" | +1.4% | 60.8 mph | Compare |
| 195/50R15 | 22.68" | 7.68" | −1.5% | 59.1 mph | Compare |
| 215/45R15 | 22.62" | 8.46" | −1.7% | 59.0 mph | Compare |
| 165/65R15 | 23.44" | 6.50" | +1.9% | 61.1 mph | Compare |
| 195/55R15 | 23.44" | 7.68" | +1.9% | 61.1 mph | Compare |
| 175/55R15 | 22.58" | 6.89" | −1.9% | 58.9 mph | Compare |
| 215/50R15 | 23.46" | 8.46" | +2.0% | 61.2 mph | Compare |
| 245/45R15 | 23.68" | 9.65" | +2.9% | 61.7 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 205/25R19 | 19" | 23.04" | +0.1% | Compare |
| 195/65R13 | 13" | 22.98" | −0.1% | Compare |
| 175/65R14 | 14" | 22.96" | −0.2% | Compare |
| 225/40R16 | 16" | 23.09" | +0.3% | Compare |
| 165/70R14 | 14" | 23.09" | +0.4% | Compare |
| 215/35R17 | 17" | 22.93" | −0.4% | Compare |
| 195/45R16 | 16" | 22.91" | −0.4% | Compare |
| 195/40R17 | 17" | 23.14" | +0.6% | Compare |
| 205/55R14 | 14" | 22.88" | −0.6% | Compare |
| 155/75R14 | 14" | 23.15" | +0.6% | Compare |
| 215/60R13 | 13" | 23.16" | +0.6% | Compare |
| 185/70R13 | 13" | 23.20" | +0.8% | Compare |
One size up or down
- 175/55R15narrower: 22.6" × 6.9"
- 195/55R15wider: 23.4" × 7.7"
- 185/50R15lower profile: 22.3" × 7.3"
- 185/60R15taller sidewall: 23.7" × 7.3"
Compare 185/55R15 with another size
Questions
- How tall is a 185/55R15 tire?
- A 185/55R15 tire is 23.0 inches tall (585 mm), calculated from the size. It is 7.3 inches wide with 4.0 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 185/55R15 mean?
- 185/55R15 means a tire 185 mm wide, with sidewalls 55% as tall as the tire is wide (102 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 185/55R15 tire make?
- About 876 revolutions per mile, based on a circumference of 72.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 185/55R15 tire?
- Roughly 5.0" to 6.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 225/45R15 instead of 185/55R15?
- 225/45R15 is −0.04 inches (−0.2%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.