275/50R18 tire size in inches
A 275/50R18 tire measures
28.8" tall × 10.8" wide
5.41" sidewall on a 18" wheel. 700 revolutions per mile.
275/50R18 means a tire 275 mm wide, with sidewalls 50% as tall as the tire is wide (138 mm), radial construction (R), for a 18 inch wheel.
275/50R18 specs
| Overall diameter (height) | 28.83 inches (732 mm) |
|---|---|
| Section width | 10.83 inches (275 mm) |
| Sidewall height | 5.41 inches (138 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 90.6 inches (2,300 mm) |
| Revolutions per mile | 700 |
| Revolutions per kilometer | 435 |
| Approximate rim width | 8.0" to 9.5" |
| In inches (flotation style) | 28.8x10.8R18 |
| 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 275/50R18 on a 18" wheel
These 18" sizes are within 3% of 275/50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 305/45R18 | 28.81" | 12.01" | −0.1% | 60.0 mph | Compare |
| 195/70R18 | 28.75" | 7.68" | −0.3% | 59.8 mph | Compare |
| 215/65R18 | 29.00" | 8.46" | +0.6% | 60.4 mph | Compare |
| 225/60R18 | 28.63" | 8.86" | −0.7% | 59.6 mph | Compare |
| 245/55R18 | 28.61" | 9.65" | −0.8% | 59.5 mph | Compare |
| 255/55R18 | 29.04" | 10.04" | +0.8% | 60.5 mph | Compare |
| 235/60R18 | 29.10" | 9.25" | +1.0% | 60.6 mph | Compare |
| 335/40R18 | 28.55" | 13.19" | −1.0% | 59.4 mph | Compare |
| 205/65R18 | 28.49" | 8.07" | −1.2% | 59.3 mph | Compare |
| 315/45R18 | 29.16" | 12.40" | +1.2% | 60.7 mph | Compare |
| 295/45R18 | 28.45" | 11.61" | −1.3% | 59.2 mph | Compare |
| 265/50R18 | 28.43" | 10.43" | −1.4% | 59.2 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 215/70R17 | 17" | 28.85" | +0.1% | Compare |
| 235/80R14 | 14" | 28.80" | −0.1% | Compare |
| 285/35R21 | 21" | 28.85" | +0.1% | Compare |
| 225/50R20 | 20" | 28.86" | +0.1% | Compare |
| 345/25R22 | 22" | 28.79" | −0.1% | Compare |
| 355/35R19 | 19" | 28.78" | −0.2% | Compare |
| 235/75R15 | 15" | 28.88" | +0.2% | Compare |
| 295/55R16 | 16" | 28.78" | −0.2% | Compare |
| 245/35R22 | 22" | 28.75" | −0.3% | Compare |
| 225/55R19 | 19" | 28.74" | −0.3% | Compare |
| 275/55R17 | 17" | 28.91" | +0.3% | Compare |
| 275/45R19 | 19" | 28.74" | −0.3% | Compare |
One size up or down
- 265/50R18narrower: 28.4" × 10.4"
- 285/50R18wider: 29.2" × 11.2"
- 275/45R18lower profile: 27.7" × 10.8"
- 275/55R18taller sidewall: 29.9" × 10.8"
Compare 275/50R18 with another size
Questions
- How tall is a 275/50R18 tire?
- A 275/50R18 tire is 28.8 inches tall (732 mm), calculated from the size. It is 10.8 inches wide with 5.4 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 275/50R18 mean?
- 275/50R18 means a tire 275 mm wide, with sidewalls 50% as tall as the tire is wide (138 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 275/50R18 tire make?
- About 700 revolutions per mile, based on a circumference of 90.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 275/50R18 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 305/45R18 instead of 275/50R18?
- 305/45R18 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.