245/50R18 tire size in inches
A 245/50R18 tire measures
27.6" tall × 9.6" wide
4.82" sidewall on a 18" wheel. 730 revolutions per mile.
245/50R18 means a tire 245 mm wide, with sidewalls 50% as tall as the tire is wide (123 mm), radial construction (R), for a 18 inch wheel.
245/50R18 specs
| Overall diameter (height) | 27.65 inches (702 mm) |
|---|---|
| Section width | 9.65 inches (245 mm) |
| Sidewall height | 4.82 inches (123 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 86.9 inches (2,206 mm) |
| Revolutions per mile | 730 |
| Revolutions per kilometer | 453 |
| Approximate rim width | 7.0" to 8.5" |
| In inches (flotation style) | 27.6x9.6R18 |
| 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 245/50R18 on a 18" wheel
These 18" sizes are within 3% of 245/50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 205/60R18 | 27.69" | 8.07" | +0.1% | 60.1 mph | Compare |
| 305/40R18 | 27.61" | 12.01" | −0.1% | 59.9 mph | Compare |
| 225/55R18 | 27.74" | 8.86" | +0.4% | 60.2 mph | Compare |
| 275/45R18 | 27.74" | 10.83" | +0.4% | 60.2 mph | Compare |
| 265/45R18 | 27.39" | 10.43" | −0.9% | 59.4 mph | Compare |
| 315/40R18 | 27.92" | 12.40" | +1.0% | 60.6 mph | Compare |
| 195/65R18 | 27.98" | 7.68" | +1.2% | 60.7 mph | Compare |
| 215/55R18 | 27.31" | 8.46" | −1.2% | 59.3 mph | Compare |
| 295/40R18 | 27.29" | 11.61" | −1.3% | 59.2 mph | Compare |
| 255/50R18 | 28.04" | 10.04" | +1.4% | 60.9 mph | Compare |
| 235/50R18 | 27.25" | 9.25" | −1.4% | 59.1 mph | Compare |
| 335/35R18 | 27.23" | 13.19" | −1.5% | 59.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 185/80R16 | 16" | 27.65" | 0.0% | Compare |
| 275/40R19 | 19" | 27.66" | +0.1% | Compare |
| 225/60R17 | 17" | 27.63" | −0.1% | Compare |
| 215/45R20 | 20" | 27.62" | −0.1% | Compare |
| 295/50R16 | 16" | 27.61" | −0.1% | Compare |
| 325/30R20 | 20" | 27.68" | +0.1% | Compare |
| 245/45R19 | 19" | 27.68" | +0.1% | Compare |
| 315/35R19 | 19" | 27.68" | +0.1% | Compare |
| 245/55R17 | 17" | 27.61" | −0.1% | Compare |
| 285/25R22 | 22" | 27.61" | −0.1% | Compare |
| 215/75R15 | 15" | 27.70" | +0.2% | Compare |
| 335/25R21 | 21" | 27.59" | −0.2% | Compare |
One size up or down
- 235/50R18narrower: 27.3" × 9.3"
- 255/50R18wider: 28.0" × 10.0"
- 245/45R18lower profile: 26.7" × 9.6"
- 245/55R18taller sidewall: 28.6" × 9.6"
Compare 245/50R18 with another size
Questions
- How tall is a 245/50R18 tire?
- A 245/50R18 tire is 27.6 inches tall (702 mm), calculated from the size. It is 9.6 inches wide with 4.8 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 245/50R18 mean?
- 245/50R18 means a tire 245 mm wide, with sidewalls 50% as tall as the tire is wide (123 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 245/50R18 tire make?
- About 730 revolutions per mile, based on a circumference of 86.9 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 245/50R18 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 205/60R18 instead of 245/50R18?
- 205/60R18 is +0.04 inches (+0.1%) 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.