285/35R18 tire size in inches
A 285/35R18 tire measures
25.9" tall × 11.2" wide
3.93" sidewall on a 18" wheel. 780 revolutions per mile.
285/35R18 means a tire 285 mm wide, with sidewalls 35% as tall as the tire is wide (100 mm), radial construction (R), for a 18 inch wheel.
285/35R18 specs
| Overall diameter (height) | 25.85 inches (657 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 3.93 inches (100 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 81.2 inches (2,063 mm) |
| Revolutions per mile | 780 |
| Revolutions per kilometer | 485 |
| Approximate rim width | 9.5" to 11.0" |
| In inches (flotation style) | 25.9x11.2R18 |
| 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 285/35R18 on a 18" wheel
These 18" sizes are within 3% of 285/35R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 225/45R18 | 25.97" | 8.86" | +0.5% | 60.3 mph | Compare |
| 245/40R18 | 25.72" | 9.65" | −0.5% | 59.7 mph | Compare |
| 195/50R18 | 25.68" | 7.68" | −0.7% | 59.6 mph | Compare |
| 255/40R18 | 26.03" | 10.04" | +0.7% | 60.4 mph | Compare |
| 205/50R18 | 26.07" | 8.07" | +0.8% | 60.5 mph | Compare |
| 215/45R18 | 25.62" | 8.46" | −0.9% | 59.5 mph | Compare |
| 295/35R18 | 26.13" | 11.61" | +1.1% | 60.6 mph | Compare |
| 275/35R18 | 25.58" | 10.83" | −1.1% | 59.4 mph | Compare |
| 235/40R18 | 25.40" | 9.25" | −1.8% | 58.9 mph | Compare |
| 235/45R18 | 26.33" | 9.25" | +1.8% | 61.1 mph | Compare |
| 265/40R18 | 26.35" | 10.43" | +1.9% | 61.1 mph | Compare |
| 265/35R18 | 25.30" | 10.43" | −2.1% | 58.7 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 225/50R17 | 17" | 25.86" | 0.0% | Compare |
| 215/70R14 | 14" | 25.85" | 0.0% | Compare |
| 205/55R17 | 17" | 25.88" | +0.1% | Compare |
| 275/50R15 | 15" | 25.83" | −0.1% | Compare |
| 245/25R21 | 21" | 25.82" | −0.1% | Compare |
| 295/25R20 | 20" | 25.81" | −0.2% | Compare |
| 205/80R13 | 13" | 25.91" | +0.2% | Compare |
| 345/25R19 | 19" | 25.79" | −0.2% | Compare |
| 245/30R20 | 20" | 25.79" | −0.3% | Compare |
| 215/35R20 | 20" | 25.93" | +0.3% | Compare |
| 185/75R15 | 15" | 25.93" | +0.3% | Compare |
| 215/40R19 | 19" | 25.77" | −0.3% | Compare |
One size up or down
- 275/35R18narrower: 25.6" × 10.8"
- 295/35R18wider: 26.1" × 11.6"
- 285/40R18taller sidewall: 27.0" × 11.2"
Compare 285/35R18 with another size
Questions
- How tall is a 285/35R18 tire?
- A 285/35R18 tire is 25.9 inches tall (657 mm), calculated from the size. It is 11.2 inches wide with 3.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/35R18 mean?
- 285/35R18 means a tire 285 mm wide, with sidewalls 35% as tall as the tire is wide (100 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 285/35R18 tire make?
- About 780 revolutions per mile, based on a circumference of 81.2 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/35R18 tire?
- Roughly 9.5" to 11.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 225/45R18 instead of 285/35R18?
- 225/45R18 is +0.12 inches (+0.5%) in overall diameter, so at an indicated 60 mph you would be doing 60.3 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.