285/50R18 tire size in inches
A 285/50R18 tire measures
29.2" tall × 11.2" wide
5.61" sidewall on a 18" wheel. 690 revolutions per mile.
285/50R18 means a tire 285 mm wide, with sidewalls 50% as tall as the tire is wide (143 mm), radial construction (R), for a 18 inch wheel.
285/50R18 specs
| Overall diameter (height) | 29.22 inches (742 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 5.61 inches (143 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 91.8 inches (2,332 mm) |
| Revolutions per mile | 690 |
| Revolutions per kilometer | 429 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 29.2x11.2R18 |
| Aspect ratio | 50% |
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 285/50R18 on a 18" wheel
These 18" sizes are within 3% of 285/50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 315/45R18 | 29.16" | 12.40" | −0.2% | 59.9 mph | Compare |
| 205/70R18 | 29.30" | 8.07" | +0.3% | 60.2 mph | Compare |
| 235/60R18 | 29.10" | 9.25" | −0.4% | 59.8 mph | Compare |
| 255/55R18 | 29.04" | 10.04" | −0.6% | 59.6 mph | Compare |
| 215/65R18 | 29.00" | 8.46" | −0.7% | 59.6 mph | Compare |
| 265/55R18 | 29.48" | 10.43" | +0.9% | 60.5 mph | Compare |
| 195/75R18 | 29.52" | 7.68" | +1.0% | 60.6 mph | Compare |
| 225/65R18 | 29.52" | 8.86" | +1.0% | 60.6 mph | Compare |
| 325/45R18 | 29.52" | 12.80" | +1.0% | 60.6 mph | Compare |
| 245/60R18 | 29.57" | 9.65" | +1.2% | 60.7 mph | Compare |
| 275/50R18 | 28.83" | 10.83" | −1.3% | 59.2 mph | Compare |
| 295/50R18 | 29.61" | 11.61" | +1.3% | 60.8 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/25R24 | 24" | 29.22" | 0.0% | Compare |
| 335/35R20 | 20" | 29.23" | 0.0% | Compare |
| 305/30R22 | 22" | 29.20" | −0.1% | Compare |
| 325/40R19 | 19" | 29.24" | +0.1% | Compare |
| 235/50R20 | 20" | 29.25" | +0.1% | Compare |
| 235/55R19 | 19" | 29.18" | −0.1% | Compare |
| 225/80R15 | 15" | 29.17" | −0.2% | Compare |
| 215/60R19 | 19" | 29.16" | −0.2% | Compare |
| 225/75R16 | 16" | 29.29" | +0.2% | Compare |
| 345/30R21 | 21" | 29.15" | −0.2% | Compare |
| 295/40R20 | 20" | 29.29" | +0.2% | Compare |
| 265/35R22 | 22" | 29.30" | +0.3% | Compare |
One size up or down
- 275/50R18narrower: 28.8" × 10.8"
- 295/50R18wider: 29.6" × 11.6"
- 285/45R18lower profile: 28.1" × 11.2"
- 285/55R18taller sidewall: 30.3" × 11.2"
Compare 285/50R18 with another size
Questions
- How tall is a 285/50R18 tire?
- A 285/50R18 tire is 29.2 inches tall (742 mm), calculated from the size. It is 11.2 inches wide with 5.6 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/50R18 mean?
- 285/50R18 means a tire 285 mm wide, with sidewalls 50% as tall as the tire is wide (143 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 285/50R18 tire make?
- About 690 revolutions per mile, based on a circumference of 91.8 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/50R18 tire?
- Roughly 8.0" to 9.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 315/45R18 instead of 285/50R18?
- 315/45R18 is −0.06 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.