185/85R15 tire size in inches
A 185/85R15 tire measures
27.4" tall × 7.3" wide
6.19" sidewall on a 15" wheel. 737 revolutions per mile.
185/85R15 means a tire 185 mm wide, with sidewalls 85% as tall as the tire is wide (157 mm), radial construction (R), for a 15 inch wheel.
185/85R15 specs
| Overall diameter (height) | 27.38 inches (695 mm) |
|---|---|
| Section width | 7.28 inches (185 mm) |
| Sidewall height | 6.19 inches (157 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 86.0 inches (2,185 mm) |
| Revolutions per mile | 737 |
| Revolutions per kilometer | 458 |
| Approximate rim width | 5.0" to 6.5" |
| In inches (flotation style) | 27.4x7.3R15 |
| Aspect ratio | 85% |
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 185/85R15 on a 15" wheel
These 15" sizes are within 3% of 185/85R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/70R15 | 27.40" | 8.86" | +0.1% | 60.0 mph | Compare |
| 285/55R15 | 27.34" | 11.22" | −0.1% | 59.9 mph | Compare |
| 195/80R15 | 27.28" | 7.68" | −0.4% | 59.8 mph | Compare |
| 265/60R15 | 27.52" | 10.43" | +0.5% | 60.3 mph | Compare |
| 245/65R15 | 27.54" | 9.65" | +0.6% | 60.3 mph | Compare |
| 205/75R15 | 27.11" | 8.07" | −1.0% | 59.4 mph | Compare |
| 215/75R15 | 27.70" | 8.46" | +1.2% | 60.7 mph | Compare |
| 255/60R15 | 27.05" | 10.04" | −1.2% | 59.3 mph | Compare |
| 235/65R15 | 27.03" | 9.25" | −1.3% | 59.2 mph | Compare |
| 275/55R15 | 26.91" | 10.83" | −1.7% | 59.0 mph | Compare |
| 205/80R15 | 27.91" | 8.07" | +1.9% | 61.2 mph | Compare |
| 215/70R15 | 26.85" | 8.46" | −1.9% | 58.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 355/30R19 | 19" | 27.39" | 0.0% | Compare |
| 215/85R13 | 13" | 27.39" | 0.0% | Compare |
| 265/45R18 | 18" | 27.39" | 0.0% | Compare |
| 325/25R21 | 21" | 27.40" | +0.1% | Compare |
| 235/40R20 | 20" | 27.40" | +0.1% | Compare |
| 305/35R19 | 19" | 27.41" | +0.1% | Compare |
| 275/25R22 | 22" | 27.41" | +0.1% | Compare |
| 265/40R19 | 19" | 27.35" | −0.1% | Compare |
| 265/50R17 | 17" | 27.43" | +0.2% | Compare |
| 235/45R19 | 19" | 27.33" | −0.2% | Compare |
| 315/30R20 | 20" | 27.44" | +0.2% | Compare |
| 215/55R18 | 18" | 27.31" | −0.3% | Compare |
One size up or down
Compare 185/85R15 with another size
Questions
- How tall is a 185/85R15 tire?
- A 185/85R15 tire is 27.4 inches tall (695 mm), calculated from the size. It is 7.3 inches wide with 6.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 185/85R15 mean?
- 185/85R15 means a tire 185 mm wide, with sidewalls 85% as tall as the tire is wide (157 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 185/85R15 tire make?
- About 737 revolutions per mile, based on a circumference of 86.0 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 185/85R15 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 225/70R15 instead of 185/85R15?
- 225/70R15 is +0.02 inches (+0.1%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.