275/75R18 tire size in inches
A 275/75R18 tire measures
34.2" tall × 10.8" wide
8.12" sidewall on a 18" wheel. 589 revolutions per mile.
275/75R18 means a tire 275 mm wide, with sidewalls 75% as tall as the tire is wide (206 mm), radial construction (R), for a 18 inch wheel.
275/75R18 specs
| Overall diameter (height) | 34.24 inches (870 mm) |
|---|---|
| Section width | 10.83 inches (275 mm) |
| Sidewall height | 8.12 inches (206 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 107.6 inches (2,732 mm) |
| Revolutions per mile | 589 |
| Revolutions per kilometer | 366 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 34.2x10.8R18 |
| Aspect ratio | 75% |
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 275/75R18 on a 18" wheel
These 18" sizes are within 3% of 275/75R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 295/70R18 | 34.26" | 11.61" | +0.1% | 60.0 mph | Compare |
| 315/65R18 | 34.12" | 12.40" | −0.3% | 59.8 mph | Compare |
| 325/65R18 | 34.63" | 12.80" | +1.1% | 60.7 mph | Compare |
| 335/60R18 | 33.83" | 13.19" | −1.2% | 59.3 mph | Compare |
| 285/70R18 | 33.71" | 11.22" | −1.6% | 59.1 mph | Compare |
| 305/70R18 | 34.81" | 12.01" | +1.7% | 61.0 mph | Compare |
| 285/75R18 | 34.83" | 11.22" | +1.7% | 61.0 mph | Compare |
| 265/75R18 | 33.65" | 10.43" | −1.7% | 59.0 mph | Compare |
| 305/65R18 | 33.61" | 12.01" | −1.8% | 58.9 mph | Compare |
| 35x12.50R18 | 35.00" | 12.50" | +2.2% | 61.3 mph | Compare |
| 325/60R18 | 33.35" | 12.80" | −2.6% | 58.4 mph | Compare |
| 335/65R18 | 35.15" | 13.19" | +2.6% | 61.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 325/40R24 | 24" | 34.24" | 0.0% | Compare |
| 345/45R22 | 22" | 34.22" | 0.0% | Compare |
| 305/55R21 | 21" | 34.21" | −0.1% | Compare |
| 335/50R21 | 21" | 34.19" | −0.1% | Compare |
| 285/55R22 | 22" | 34.34" | +0.3% | Compare |
| 325/60R19 | 19" | 34.35" | +0.3% | Compare |
| 315/70R17 | 17" | 34.36" | +0.4% | Compare |
| 355/55R19 | 19" | 34.37" | +0.4% | Compare |
| 295/65R19 | 19" | 34.10" | −0.4% | Compare |
| 315/50R22 | 22" | 34.40" | +0.5% | Compare |
| 275/85R16 | 16" | 34.41" | +0.5% | Compare |
| 275/65R20 | 20" | 34.07" | −0.5% | Compare |
One size up or down
Compare 275/75R18 with another size
Questions
- How tall is a 275/75R18 tire?
- A 275/75R18 tire is 34.2 inches tall (870 mm), calculated from the size. It is 10.8 inches wide with 8.1 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 275/75R18 mean?
- 275/75R18 means a tire 275 mm wide, with sidewalls 75% as tall as the tire is wide (206 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 275/75R18 tire make?
- About 589 revolutions per mile, based on a circumference of 107.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 275/75R18 tire?
- Roughly 7.5" to 9.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 295/70R18 instead of 275/75R18?
- 295/70R18 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.