255/45R15 tire size in inches
A 255/45R15 tire measures
24.0" tall × 10.0" wide
4.52" sidewall on a 15" wheel. 839 revolutions per mile.
255/45R15 means a tire 255 mm wide, with sidewalls 45% as tall as the tire is wide (115 mm), radial construction (R), for a 15 inch wheel.
255/45R15 specs
| Overall diameter (height) | 24.04 inches (610 mm) |
|---|---|
| Section width | 10.04 inches (255 mm) |
| Sidewall height | 4.52 inches (115 mm) |
| Wheel (rim) diameter | 15 inches |
| Circumference | 75.5 inches (1,918 mm) |
| Revolutions per mile | 839 |
| Revolutions per kilometer | 521 |
| Approximate rim width | 8.5" to 10.0" |
| In inches (flotation style) | 24.0x10.0R15 |
| Aspect ratio | 45% |
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 255/45R15 on a 15" wheel
These 15" sizes are within 3% of 255/45R15's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 165/70R15 | 24.09" | 6.50" | +0.2% | 60.1 mph | Compare |
| 175/65R15 | 23.96" | 6.89" | −0.3% | 59.8 mph | Compare |
| 205/55R15 | 23.88" | 8.07" | −0.7% | 59.6 mph | Compare |
| 225/50R15 | 23.86" | 8.86" | −0.7% | 59.6 mph | Compare |
| 195/60R15 | 24.21" | 7.68" | +0.7% | 60.4 mph | Compare |
| 235/50R15 | 24.25" | 9.25" | +0.9% | 60.5 mph | Compare |
| 215/55R15 | 24.31" | 8.46" | +1.1% | 60.7 mph | Compare |
| 185/60R15 | 23.74" | 7.28" | −1.2% | 59.3 mph | Compare |
| 245/45R15 | 23.68" | 9.65" | −1.5% | 59.1 mph | Compare |
| 265/45R15 | 24.39" | 10.43" | +1.5% | 60.9 mph | Compare |
| 185/65R15 | 24.47" | 7.28" | +1.8% | 61.1 mph | Compare |
| 215/50R15 | 23.46" | 8.46" | −2.4% | 58.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 255/40R16 | 16" | 24.03" | 0.0% | Compare |
| 255/35R17 | 17" | 24.03" | 0.0% | Compare |
| 165/85R13 | 13" | 24.04" | 0.0% | Compare |
| 175/80R13 | 13" | 24.02" | 0.0% | Compare |
| 255/25R19 | 19" | 24.02" | −0.1% | Compare |
| 185/55R16 | 16" | 24.01" | −0.1% | Compare |
| 215/65R13 | 13" | 24.00" | −0.1% | Compare |
| 205/50R16 | 16" | 24.07" | +0.1% | Compare |
| 215/30R19 | 19" | 24.08" | +0.2% | Compare |
| 225/40R17 | 17" | 24.09" | +0.2% | Compare |
| 195/65R14 | 14" | 23.98" | −0.2% | Compare |
| 225/45R16 | 16" | 23.97" | −0.3% | Compare |
One size up or down
Compare 255/45R15 with another size
Questions
- How tall is a 255/45R15 tire?
- A 255/45R15 tire is 24.0 inches tall (610 mm), calculated from the size. It is 10.0 inches wide with 4.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 255/45R15 mean?
- 255/45R15 means a tire 255 mm wide, with sidewalls 45% as tall as the tire is wide (115 mm), radial construction (R), for a 15 inch wheel.
- How many revolutions per mile does a 255/45R15 tire make?
- About 839 revolutions per mile, based on a circumference of 75.5 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 255/45R15 tire?
- Roughly 8.5" to 10.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 165/70R15 instead of 255/45R15?
- 165/70R15 is +0.06 inches (+0.2%) in overall diameter, so at an indicated 60 mph you would be doing 60.1 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.