235/50R18 tire size in inches
A 235/50R18 tire measures
27.3" tall × 9.3" wide
4.63" sidewall on a 18" wheel. 740 revolutions per mile.
235/50R18 means a tire 235 mm wide, with sidewalls 50% as tall as the tire is wide (118 mm), radial construction (R), for a 18 inch wheel.
235/50R18 specs
| Overall diameter (height) | 27.25 inches (692 mm) |
|---|---|
| Section width | 9.25 inches (235 mm) |
| Sidewall height | 4.63 inches (118 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 85.6 inches (2,175 mm) |
| Revolutions per mile | 740 |
| Revolutions per kilometer | 460 |
| Approximate rim width | 6.5" to 8.0" |
| In inches (flotation style) | 27.3x9.3R18 |
| 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 235/50R18 on a 18" wheel
These 18" sizes are within 3% of 235/50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 335/35R18 | 27.23" | 13.19" | −0.1% | 60.0 mph | Compare |
| 195/60R18 | 27.21" | 7.68" | −0.1% | 59.9 mph | Compare |
| 295/40R18 | 27.29" | 11.61" | +0.1% | 60.1 mph | Compare |
| 215/55R18 | 27.31" | 8.46" | +0.2% | 60.1 mph | Compare |
| 265/45R18 | 27.39" | 10.43" | +0.5% | 60.3 mph | Compare |
| 255/45R18 | 27.04" | 10.04" | −0.8% | 59.5 mph | Compare |
| 285/40R18 | 26.98" | 11.22" | −1.0% | 59.4 mph | Compare |
| 325/35R18 | 26.96" | 12.80" | −1.1% | 59.3 mph | Compare |
| 305/40R18 | 27.61" | 12.01" | +1.3% | 60.8 mph | Compare |
| 205/55R18 | 26.88" | 8.07" | −1.4% | 59.2 mph | Compare |
| 225/50R18 | 26.86" | 8.86" | −1.4% | 59.1 mph | Compare |
| 245/50R18 | 27.65" | 9.65" | +1.4% | 60.9 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/30R21 | 21" | 27.26" | 0.0% | Compare |
| 195/80R15 | 15" | 27.28" | +0.1% | Compare |
| 285/50R16 | 16" | 27.22" | −0.1% | Compare |
| 225/75R14 | 14" | 27.29" | +0.1% | Compare |
| 265/25R22 | 22" | 27.22" | −0.1% | Compare |
| 305/30R20 | 20" | 27.20" | −0.2% | Compare |
| 205/70R16 | 16" | 27.30" | +0.2% | Compare |
| 225/35R21 | 21" | 27.20" | −0.2% | Compare |
| 315/25R21 | 21" | 27.20" | −0.2% | Compare |
| 265/35R20 | 20" | 27.30" | +0.2% | Compare |
| 185/70R17 | 17" | 27.20" | −0.2% | Compare |
| 235/55R17 | 17" | 27.18" | −0.3% | Compare |
One size up or down
- 225/50R18narrower: 26.9" × 8.9"
- 245/50R18wider: 27.6" × 9.6"
- 235/45R18lower profile: 26.3" × 9.3"
- 235/55R18taller sidewall: 28.2" × 9.3"
Compare 235/50R18 with another size
Questions
- How tall is a 235/50R18 tire?
- A 235/50R18 tire is 27.3 inches tall (692 mm), calculated from the size. It is 9.3 inches wide with 4.6 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 235/50R18 mean?
- 235/50R18 means a tire 235 mm wide, with sidewalls 50% as tall as the tire is wide (118 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 235/50R18 tire make?
- About 740 revolutions per mile, based on a circumference of 85.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 235/50R18 tire?
- Roughly 6.5" to 8.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 335/35R18 instead of 235/50R18?
- 335/35R18 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.