175/85R15 tire size in inches
A 175/85R15 tire measures
26.7" tall × 6.9" wide
5.86" sidewall on a 15" wheel. 755 revolutions per mile.
175/85R15 means a tire 175 mm wide, with sidewalls 85% as tall as the tire is wide (149 mm), radial construction (R), for a 15 inch wheel.
175/85R15 specs
| Overall diameter (height) | 26.71 inches (679 mm) |
|---|---|
| Section width | 6.89 inches (175 mm) |
| Sidewall height | 5.86 inches (149 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 83.9 inches (2,132 mm) |
| Revolutions per mile | 755 |
| Revolutions per kilometer | 469 |
| Approximate rim width | 4.5" to 6.0" |
| In inches (flotation style) | 26.7x6.9R15 |
| 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 175/85R15 on a 15" wheel
These 15" sizes are within 3% of 175/85R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 185/80R15 | 26.65" | 7.28" | −0.2% | 59.9 mph | Compare |
| 215/70R15 | 26.85" | 8.46" | +0.5% | 60.3 mph | Compare |
| 245/60R15 | 26.57" | 9.65" | −0.5% | 59.7 mph | Compare |
| 275/55R15 | 26.91" | 10.83" | +0.7% | 60.4 mph | Compare |
| 195/75R15 | 26.52" | 7.68" | −0.7% | 59.6 mph | Compare |
| 225/65R15 | 26.52" | 8.86" | −0.7% | 59.6 mph | Compare |
| 265/55R15 | 26.48" | 10.43" | −0.9% | 59.5 mph | Compare |
| 235/65R15 | 27.03" | 9.25" | +1.2% | 60.7 mph | Compare |
| 255/60R15 | 27.05" | 10.04" | +1.3% | 60.8 mph | Compare |
| 205/75R15 | 27.11" | 8.07" | +1.5% | 60.9 mph | Compare |
| 205/70R15 | 26.30" | 8.07" | −1.5% | 59.1 mph | Compare |
| 285/50R15 | 26.22" | 11.22" | −1.8% | 58.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 245/40R19 | 19" | 26.72" | 0.0% | Compare |
| 205/85R13 | 13" | 26.72" | 0.0% | Compare |
| 215/75R14 | 14" | 26.70" | −0.1% | Compare |
| 285/30R20 | 20" | 26.73" | +0.1% | Compare |
| 205/60R17 | 17" | 26.69" | −0.1% | Compare |
| 225/55R17 | 17" | 26.74" | +0.1% | Compare |
| 245/45R18 | 18" | 26.68" | −0.1% | Compare |
| 275/45R17 | 17" | 26.74" | +0.1% | Compare |
| 315/35R18 | 18" | 26.68" | −0.1% | Compare |
| 195/70R16 | 16" | 26.75" | +0.1% | Compare |
| 325/30R19 | 19" | 26.68" | −0.1% | Compare |
| 245/35R20 | 20" | 26.75" | +0.1% | Compare |
One size up or down
Compare 175/85R15 with another size
Questions
- How tall is a 175/85R15 tire?
- A 175/85R15 tire is 26.7 inches tall (679 mm), calculated from the size. It is 6.9 inches wide with 5.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 175/85R15 mean?
- 175/85R15 means a tire 175 mm wide, with sidewalls 85% as tall as the tire is wide (149 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 175/85R15 tire make?
- About 755 revolutions per mile, based on a circumference of 83.9 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 175/85R15 tire?
- Roughly 4.5" to 6.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 185/80R15 instead of 175/85R15?
- 185/80R15 is −0.06 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.