185/75R15 tire size in inches
A 185/75R15 tire measures
25.9" tall × 7.3" wide
5.46" sidewall on a 15" wheel. 778 revolutions per mile.
185/75R15 means a tire 185 mm wide, with sidewalls 75% as tall as the tire is wide (139 mm), radial construction (R), for a 15 inch wheel.
185/75R15 specs
| Overall diameter (height) | 25.93 inches (659 mm) |
|---|---|
| Section width | 7.28 inches (185 mm) |
| Sidewall height | 5.46 inches (139 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 81.4 inches (2,069 mm) |
| Revolutions per mile | 778 |
| Revolutions per kilometer | 483 |
| Approximate rim width | 5.0" to 6.5" |
| In inches (flotation style) | 25.9x7.3R15 |
| Aspect ratio | 75% |
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 185/75R15 on a 15" wheel
These 15" sizes are within 3% of 185/75R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 215/65R15 | 26.00" | 8.46" | +0.3% | 60.2 mph | Compare |
| 175/80R15 | 26.02" | 6.89" | +0.4% | 60.2 mph | Compare |
| 275/50R15 | 25.83" | 10.83" | −0.4% | 59.8 mph | Compare |
| 165/85R15 | 26.04" | 6.50" | +0.5% | 60.3 mph | Compare |
| 255/55R15 | 26.04" | 10.04" | +0.5% | 60.3 mph | Compare |
| 235/60R15 | 26.10" | 9.25" | +0.7% | 60.4 mph | Compare |
| 195/70R15 | 25.75" | 7.68" | −0.7% | 59.6 mph | Compare |
| 285/50R15 | 26.22" | 11.22" | +1.1% | 60.7 mph | Compare |
| 225/60R15 | 25.63" | 8.86" | −1.1% | 59.3 mph | Compare |
| 245/55R15 | 25.61" | 9.65" | −1.2% | 59.3 mph | Compare |
| 205/70R15 | 26.30" | 8.07" | +1.4% | 60.9 mph | Compare |
| 205/65R15 | 25.49" | 8.07" | −1.7% | 59.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 215/35R20 | 20" | 25.93" | 0.0% | Compare |
| 205/80R13 | 13" | 25.91" | 0.0% | Compare |
| 235/70R13 | 13" | 25.95" | +0.1% | Compare |
| 295/30R19 | 19" | 25.97" | +0.2% | Compare |
| 225/45R18 | 18" | 25.97" | +0.2% | Compare |
| 205/55R17 | 17" | 25.88" | −0.2% | Compare |
| 285/40R17 | 17" | 25.98" | +0.2% | Compare |
| 195/65R16 | 16" | 25.98" | +0.2% | Compare |
| 355/25R19 | 19" | 25.99" | +0.2% | Compare |
| 225/50R17 | 17" | 25.86" | −0.3% | Compare |
| 285/35R18 | 18" | 25.85" | −0.3% | Compare |
| 215/70R14 | 14" | 25.85" | −0.3% | Compare |
One size up or down
- 175/75R15narrower: 25.3" × 6.9"
- 195/75R15wider: 26.5" × 7.7"
- 185/70R15lower profile: 25.2" × 7.3"
- 185/80R15taller sidewall: 26.7" × 7.3"
Compare 185/75R15 with another size
Questions
- How tall is a 185/75R15 tire?
- A 185/75R15 tire is 25.9 inches tall (659 mm), calculated from the size. It is 7.3 inches wide with 5.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 185/75R15 mean?
- 185/75R15 means a tire 185 mm wide, with sidewalls 75% as tall as the tire is wide (139 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 185/75R15 tire make?
- About 778 revolutions per mile, based on a circumference of 81.4 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 185/75R15 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 215/65R15 instead of 185/75R15?
- 215/65R15 is +0.08 inches (+0.3%) in overall diameter, so at an indicated 60 mph you would be doing 60.2 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.