255/35R18 tire size in inches
A 255/35R18 tire measures
25.0" tall × 10.0" wide
3.51" sidewall on a 18" wheel. 806 revolutions per mile.
255/35R18 means a tire 255 mm wide, with sidewalls 35% as tall as the tire is wide (89 mm), radial construction (R), for a 18 inch wheel.
255/35R18 specs
| Overall diameter (height) | 25.03 inches (636 mm) |
|---|---|
| Section width | 10.04 inches (255 mm) |
| Sidewall height | 3.51 inches (89 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 78.6 inches (1,997 mm) |
| Revolutions per mile | 806 |
| Revolutions per kilometer | 501 |
| Approximate rim width | 8.5" to 10.0" |
| In inches (flotation style) | 25.0x10.0R18 |
| Aspect ratio | 35% |
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 255/35R18 on a 18" wheel
These 18" sizes are within 3% of 255/35R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/40R18 | 25.09" | 8.86" | +0.2% | 60.1 mph | Compare |
| 195/45R18 | 24.91" | 7.68" | −0.5% | 59.7 mph | Compare |
| 205/45R18 | 25.26" | 8.07" | +0.9% | 60.6 mph | Compare |
| 215/40R18 | 24.77" | 8.46" | −1.0% | 59.4 mph | Compare |
| 245/35R18 | 24.75" | 9.65" | −1.1% | 59.3 mph | Compare |
| 265/35R18 | 25.30" | 10.43" | +1.1% | 60.7 mph | Compare |
| 235/40R18 | 25.40" | 9.25" | +1.5% | 60.9 mph | Compare |
| 275/35R18 | 25.58" | 10.83" | +2.2% | 61.3 mph | Compare |
| 235/35R18 | 24.48" | 9.25" | −2.2% | 58.7 mph | Compare |
| 205/40R18 | 24.46" | 8.07" | −2.3% | 58.6 mph | Compare |
| 215/45R18 | 25.62" | 8.46" | +2.4% | 61.4 mph | Compare |
| 195/50R18 | 25.68" | 7.68" | +2.6% | 61.6 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 235/65R13 | 13" | 25.03" | 0.0% | Compare |
| 175/80R14 | 14" | 25.02" | 0.0% | Compare |
| 255/40R17 | 17" | 25.03" | 0.0% | Compare |
| 255/30R19 | 19" | 25.02" | 0.0% | Compare |
| 255/45R16 | 16" | 25.04" | 0.0% | Compare |
| 255/25R20 | 20" | 25.02" | 0.0% | Compare |
| 255/50R15 | 15" | 25.04" | 0.0% | Compare |
| 165/85R14 | 14" | 25.04" | +0.1% | Compare |
| 185/55R17 | 17" | 25.01" | −0.1% | Compare |
| 255/55R14 | 14" | 25.04" | +0.1% | Compare |
| 215/65R14 | 14" | 25.00" | −0.1% | Compare |
| 305/25R19 | 19" | 25.00" | −0.1% | Compare |
One size up or down
Compare 255/35R18 with another size
Questions
- How tall is a 255/35R18 tire?
- A 255/35R18 tire is 25.0 inches tall (636 mm), calculated from the size. It is 10.0 inches wide with 3.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 255/35R18 mean?
- 255/35R18 means a tire 255 mm wide, with sidewalls 35% as tall as the tire is wide (89 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 255/35R18 tire make?
- About 806 revolutions per mile, based on a circumference of 78.6 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 255/35R18 tire?
- Roughly 8.5" to 10.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 225/40R18 instead of 255/35R18?
- 225/40R18 is +0.06 inches (+0.2%) 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.