285/45R18 tire size in inches
A 285/45R18 tire measures
28.1" tall × 11.2" wide
5.05" sidewall on a 18" wheel. 718 revolutions per mile.
285/45R18 means a tire 285 mm wide, with sidewalls 45% as tall as the tire is wide (128 mm), radial construction (R), for a 18 inch wheel.
285/45R18 specs
| Overall diameter (height) | 28.10 inches (714 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 5.05 inches (128 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 88.3 inches (2,242 mm) |
| Revolutions per mile | 718 |
| Revolutions per kilometer | 446 |
| Approximate rim width | 9.5" to 11.0" |
| In inches (flotation style) | 28.1x11.2R18 |
| 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 285/45R18 on a 18" wheel
These 18" sizes are within 3% of 285/45R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 215/60R18 | 28.16" | 8.46" | +0.2% | 60.1 mph | Compare |
| 255/50R18 | 28.04" | 10.04" | −0.2% | 59.9 mph | Compare |
| 235/55R18 | 28.18" | 9.25" | +0.3% | 60.2 mph | Compare |
| 195/65R18 | 27.98" | 7.68" | −0.4% | 59.7 mph | Compare |
| 325/40R18 | 28.24" | 12.80" | +0.5% | 60.3 mph | Compare |
| 315/40R18 | 27.92" | 12.40" | −0.6% | 59.6 mph | Compare |
| 265/50R18 | 28.43" | 10.43" | +1.2% | 60.7 mph | Compare |
| 225/55R18 | 27.74" | 8.86" | −1.3% | 59.2 mph | Compare |
| 275/45R18 | 27.74" | 10.83" | −1.3% | 59.2 mph | Compare |
| 295/45R18 | 28.45" | 11.61" | +1.3% | 60.8 mph | Compare |
| 205/65R18 | 28.49" | 8.07" | +1.4% | 60.8 mph | Compare |
| 205/60R18 | 27.69" | 8.07" | −1.5% | 59.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 235/60R17 | 17" | 28.10" | 0.0% | Compare |
| 205/75R16 | 16" | 28.11" | 0.0% | Compare |
| 225/40R21 | 21" | 28.09" | 0.0% | Compare |
| 295/35R20 | 20" | 28.13" | +0.1% | Compare |
| 225/85R13 | 13" | 28.06" | −0.1% | Compare |
| 255/70R14 | 14" | 28.06" | −0.2% | Compare |
| 195/85R15 | 15" | 28.05" | −0.2% | Compare |
| 255/65R15 | 15" | 28.05" | −0.2% | Compare |
| 255/60R16 | 16" | 28.05" | −0.2% | Compare |
| 345/30R20 | 20" | 28.15" | +0.2% | Compare |
| 255/55R17 | 17" | 28.04" | −0.2% | Compare |
| 255/45R19 | 19" | 28.04" | −0.2% | Compare |
One size up or down
- 275/45R18narrower: 27.7" × 10.8"
- 295/45R18wider: 28.5" × 11.6"
- 285/40R18lower profile: 27.0" × 11.2"
- 285/50R18taller sidewall: 29.2" × 11.2"
Compare 285/45R18 with another size
Questions
- How tall is a 285/45R18 tire?
- A 285/45R18 tire is 28.1 inches tall (714 mm), calculated from the size. It is 11.2 inches wide with 5.0 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/45R18 mean?
- 285/45R18 means a tire 285 mm wide, with sidewalls 45% as tall as the tire is wide (128 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 285/45R18 tire make?
- About 718 revolutions per mile, based on a circumference of 88.3 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/45R18 tire?
- Roughly 9.5" to 11.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 215/60R18 instead of 285/45R18?
- 215/60R18 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.