185/70R15 tire size in inches
A 185/70R15 tire measures
25.2" tall × 7.3" wide
5.10" sidewall on a 15" wheel. 800 revolutions per mile.
185/70R15 means a tire 185 mm wide, with sidewalls 70% as tall as the tire is wide (130 mm), radial construction (R), for a 15 inch wheel.
185/70R15 specs
| Overall diameter (height) | 25.20 inches (640 mm) |
|---|---|
| Section width | 7.28 inches (185 mm) |
| Sidewall height | 5.10 inches (130 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 79.2 inches (2,011 mm) |
| Revolutions per mile | 800 |
| Revolutions per kilometer | 497 |
| Approximate rim width | 5.0" to 6.5" |
| In inches (flotation style) | 25.2x7.3R15 |
| Aspect ratio | 70% |
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 185/70R15 on a 15" wheel
These 15" sizes are within 3% of 185/70R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 235/55R15 | 25.18" | 9.25" | −0.1% | 60.0 mph | Compare |
| 215/60R15 | 25.16" | 8.46" | −0.2% | 59.9 mph | Compare |
| 285/45R15 | 25.10" | 11.22" | −0.4% | 59.8 mph | Compare |
| 175/75R15 | 25.33" | 6.89" | +0.5% | 60.3 mph | Compare |
| 255/50R15 | 25.04" | 10.04" | −0.6% | 59.6 mph | Compare |
| 165/80R15 | 25.39" | 6.50" | +0.8% | 60.5 mph | Compare |
| 195/65R15 | 24.98" | 7.68" | −0.9% | 59.5 mph | Compare |
| 265/50R15 | 25.43" | 10.43" | +0.9% | 60.6 mph | Compare |
| 205/65R15 | 25.49" | 8.07" | +1.2% | 60.7 mph | Compare |
| 245/55R15 | 25.61" | 9.65" | +1.6% | 61.0 mph | Compare |
| 225/60R15 | 25.63" | 8.86" | +1.7% | 61.0 mph | Compare |
| 165/75R15 | 24.74" | 6.50" | −1.8% | 58.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/35R19 | 19" | 25.20" | 0.0% | Compare |
| 315/25R19 | 19" | 25.20" | 0.0% | Compare |
| 195/60R16 | 16" | 25.21" | +0.1% | Compare |
| 265/25R20 | 20" | 25.22" | +0.1% | Compare |
| 235/50R16 | 16" | 25.25" | +0.2% | Compare |
| 265/30R19 | 19" | 25.26" | +0.2% | Compare |
| 205/45R18 | 18" | 25.26" | +0.3% | Compare |
| 295/35R17 | 17" | 25.13" | −0.3% | Compare |
| 195/80R13 | 13" | 25.28" | +0.3% | Compare |
| 205/75R13 | 13" | 25.11" | −0.4% | Compare |
| 295/40R16 | 16" | 25.29" | +0.4% | Compare |
| 235/60R14 | 14" | 25.10" | −0.4% | Compare |
One size up or down
- 175/70R15narrower: 24.6" × 6.9"
- 195/70R15wider: 25.7" × 7.7"
- 185/65R15lower profile: 24.5" × 7.3"
- 185/75R15taller sidewall: 25.9" × 7.3"
Compare 185/70R15 with another size
Questions
- How tall is a 185/70R15 tire?
- A 185/70R15 tire is 25.2 inches tall (640 mm), calculated from the size. It is 7.3 inches wide with 5.1 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 185/70R15 mean?
- 185/70R15 means a tire 185 mm wide, with sidewalls 70% as tall as the tire is wide (130 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 185/70R15 tire make?
- About 800 revolutions per mile, based on a circumference of 79.2 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 185/70R15 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 235/55R15 instead of 185/70R15?
- 235/55R15 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.