255/85R15 tire size in inches
A 255/85R15 tire measures
32.1" tall × 10.0" wide
8.53" sidewall on a 15" wheel. 629 revolutions per mile.
255/85R15 means a tire 255 mm wide, with sidewalls 85% as tall as the tire is wide (217 mm), radial construction (R), for a 15 inch wheel.
255/85R15 specs
| Overall diameter (height) | 32.07 inches (814 mm) |
|---|---|
| Section width | 10.04 inches (255 mm) |
| Sidewall height | 8.53 inches (217 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 100.7 inches (2,559 mm) |
| Revolutions per mile | 629 |
| Revolutions per kilometer | 391 |
| Approximate rim width | 7.0" to 8.5" |
| In inches (flotation style) | 32.1x10.0R15 |
| 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 255/85R15 on a 15" wheel
These 15" sizes are within 3% of 255/85R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 32x11.50R15 | 32.00" | 11.50" | −0.2% | 59.9 mph | Compare |
| 285/75R15 | 31.83" | 11.22" | −0.7% | 59.6 mph | Compare |
| 275/80R15 | 32.32" | 10.83" | +0.8% | 60.5 mph | Compare |
| 265/80R15 | 31.69" | 10.43" | −1.2% | 59.3 mph | Compare |
| 245/85R15 | 31.40" | 9.65" | −2.1% | 58.7 mph | Compare |
| 265/85R15 | 32.74" | 10.43" | +2.1% | 61.3 mph | Compare |
| 275/75R15 | 31.24" | 10.83" | −2.6% | 58.5 mph | Compare |
| 285/80R15 | 32.95" | 11.22" | +2.8% | 61.7 mph | Compare |
| 33x12.50R15 | 33.00" | 12.50" | +2.9% | 61.7 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 255/80R16 | 16" | 32.06" | 0.0% | Compare |
| 255/75R17 | 17" | 32.06" | 0.0% | Compare |
| 275/65R18 | 18" | 32.07" | 0.0% | Compare |
| 325/55R18 | 18" | 32.07" | 0.0% | Compare |
| 255/70R18 | 18" | 32.06" | 0.0% | Compare |
| 255/65R19 | 19" | 32.05" | 0.0% | Compare |
| 255/60R20 | 20" | 32.05" | −0.1% | Compare |
| 255/55R21 | 21" | 32.04" | −0.1% | Compare |
| 255/50R22 | 22" | 32.04" | −0.1% | Compare |
| 285/45R22 | 22" | 32.10" | +0.1% | Compare |
| 295/65R17 | 17" | 32.10" | +0.1% | Compare |
| 255/40R24 | 24" | 32.03" | −0.1% | Compare |
One size up or down
Compare 255/85R15 with another size
Questions
- How tall is a 255/85R15 tire?
- A 255/85R15 tire is 32.1 inches tall (814 mm), calculated from the size. It is 10.0 inches wide with 8.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 255/85R15 mean?
- 255/85R15 means a tire 255 mm wide, with sidewalls 85% as tall as the tire is wide (217 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 255/85R15 tire make?
- About 629 revolutions per mile, based on a circumference of 100.7 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 255/85R15 tire?
- Roughly 7.0" to 8.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 32x11.50R15 instead of 255/85R15?
- 32x11.50R15 is −0.07 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.