225/85R15 tire size in inches
A 225/85R15 tire measures
30.1" tall × 8.9" wide
7.53" sidewall on a 15" wheel. 671 revolutions per mile.
225/85R15 means a tire 225 mm wide, with sidewalls 85% as tall as the tire is wide (191 mm), radial construction (R), for a 15 inch wheel.
225/85R15 specs
| Overall diameter (height) | 30.06 inches (764 mm) |
|---|---|
| Section width | 8.86 inches (225 mm) |
| Sidewall height | 7.53 inches (191 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 94.4 inches (2,399 mm) |
| Revolutions per mile | 671 |
| Revolutions per kilometer | 417 |
| Approximate rim width | 6.0" to 7.5" |
| In inches (flotation style) | 30.1x8.9R15 |
| 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 225/85R15 on a 15" wheel
These 15" sizes are within 3% of 225/85R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 255/75R15 | 30.06" | 10.04" | 0.0% | 60.0 mph | Compare |
| 30x9.50R15 | 30.00" | 9.50" | −0.2% | 59.9 mph | Compare |
| 275/70R15 | 30.16" | 10.83" | +0.3% | 60.2 mph | Compare |
| 235/80R15 | 29.80" | 9.25" | −0.9% | 59.5 mph | Compare |
| 245/80R15 | 30.43" | 9.65" | +1.2% | 60.7 mph | Compare |
| 265/70R15 | 29.61" | 10.43" | −1.5% | 59.1 mph | Compare |
| 285/65R15 | 29.59" | 11.22" | −1.6% | 59.1 mph | Compare |
| 245/75R15 | 29.47" | 9.65" | −2.0% | 58.8 mph | Compare |
| 265/75R15 | 30.65" | 10.43" | +2.0% | 61.2 mph | Compare |
| 285/70R15 | 30.71" | 11.22" | +2.2% | 61.3 mph | Compare |
| 215/85R15 | 29.39" | 8.46" | −2.2% | 58.7 mph | Compare |
| 235/85R15 | 30.73" | 9.25" | +2.2% | 61.3 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 255/80R14 | 14" | 30.06" | 0.0% | Compare |
| 255/70R16 | 16" | 30.06" | 0.0% | Compare |
| 255/65R17 | 17" | 30.05" | 0.0% | Compare |
| 255/60R18 | 18" | 30.05" | 0.0% | Compare |
| 255/55R19 | 19" | 30.04" | −0.1% | Compare |
| 275/65R16 | 16" | 30.07" | +0.1% | Compare |
| 255/50R20 | 20" | 30.04" | −0.1% | Compare |
| 255/45R21 | 21" | 30.04" | −0.1% | Compare |
| 255/40R22 | 22" | 30.03" | −0.1% | Compare |
| 235/65R18 | 18" | 30.03" | −0.1% | Compare |
| 255/30R24 | 24" | 30.02" | −0.1% | Compare |
| 285/45R20 | 20" | 30.10" | +0.1% | Compare |
One size up or down
Compare 225/85R15 with another size
Questions
- How tall is a 225/85R15 tire?
- A 225/85R15 tire is 30.1 inches tall (764 mm), calculated from the size. It is 8.9 inches wide with 7.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 225/85R15 mean?
- 225/85R15 means a tire 225 mm wide, with sidewalls 85% as tall as the tire is wide (191 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 225/85R15 tire make?
- About 671 revolutions per mile, based on a circumference of 94.4 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 225/85R15 tire?
- Roughly 6.0" to 7.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 255/75R15 instead of 225/85R15?
- 255/75R15 is 0.00 inches (0.0%) 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.