215/50R18 tire size in inches
A 215/50R18 tire measures
26.5" tall × 8.5" wide
4.23" sidewall on a 18" wheel. 762 revolutions per mile.
215/50R18 means a tire 215 mm wide, with sidewalls 50% as tall as the tire is wide (108 mm), radial construction (R), for a 18 inch wheel.
215/50R18 specs
| Overall diameter (height) | 26.46 inches (672 mm) |
|---|---|
| Section width | 8.46 inches (215 mm) |
| Sidewall height | 4.23 inches (108 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 83.1 inches (2,112 mm) |
| Revolutions per mile | 762 |
| Revolutions per kilometer | 474 |
| Approximate rim width | 6.0" to 7.5" |
| In inches (flotation style) | 26.5x8.5R18 |
| 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 215/50R18 on a 18" wheel
These 18" sizes are within 3% of 215/50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 195/55R18 | 26.44" | 7.68" | −0.1% | 60.0 mph | Compare |
| 305/35R18 | 26.41" | 12.01" | −0.2% | 59.9 mph | Compare |
| 265/40R18 | 26.35" | 10.43" | −0.4% | 59.7 mph | Compare |
| 235/45R18 | 26.33" | 9.25" | −0.5% | 59.7 mph | Compare |
| 275/40R18 | 26.66" | 10.83" | +0.7% | 60.4 mph | Compare |
| 245/45R18 | 26.68" | 9.65" | +0.8% | 60.5 mph | Compare |
| 315/35R18 | 26.68" | 12.40" | +0.8% | 60.5 mph | Compare |
| 295/35R18 | 26.13" | 11.61" | −1.3% | 59.2 mph | Compare |
| 225/50R18 | 26.86" | 8.86" | +1.5% | 60.9 mph | Compare |
| 205/50R18 | 26.07" | 8.07" | −1.5% | 59.1 mph | Compare |
| 205/55R18 | 26.88" | 8.07" | +1.6% | 60.9 mph | Compare |
| 255/40R18 | 26.03" | 10.04" | −1.6% | 59.0 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 185/65R17 | 17" | 26.47" | 0.0% | Compare |
| 235/35R20 | 20" | 26.48" | 0.0% | Compare |
| 265/55R15 | 15" | 26.48" | 0.0% | Compare |
| 295/45R16 | 16" | 26.45" | 0.0% | Compare |
| 315/30R19 | 19" | 26.44" | −0.1% | Compare |
| 205/65R16 | 16" | 26.49" | +0.1% | Compare |
| 265/50R16 | 16" | 26.43" | −0.1% | Compare |
| 275/30R20 | 20" | 26.50" | +0.1% | Compare |
| 245/70R13 | 13" | 26.50" | +0.1% | Compare |
| 195/75R15 | 15" | 26.52" | +0.2% | Compare |
| 225/65R15 | 15" | 26.52" | +0.2% | Compare |
| 275/25R21 | 21" | 26.41" | −0.2% | Compare |
One size up or down
- 205/50R18narrower: 26.1" × 8.1"
- 225/50R18wider: 26.9" × 8.9"
- 215/45R18lower profile: 25.6" × 8.5"
- 215/55R18taller sidewall: 27.3" × 8.5"
Compare 215/50R18 with another size
Questions
- How tall is a 215/50R18 tire?
- A 215/50R18 tire is 26.5 inches tall (672 mm), calculated from the size. It is 8.5 inches wide with 4.2 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 215/50R18 mean?
- 215/50R18 means a tire 215 mm wide, with sidewalls 50% as tall as the tire is wide (108 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 215/50R18 tire make?
- About 762 revolutions per mile, based on a circumference of 83.1 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 215/50R18 tire?
- Roughly 6.0" to 7.5". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 195/55R18 instead of 215/50R18?
- 195/55R18 is −0.02 inches (−0.1%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.