285/70R18 tire size in inches
A 285/70R18 tire measures
33.7" tall × 11.2" wide
7.85" sidewall on a 18" wheel. 598 revolutions per mile.
285/70R18 means a tire 285 mm wide, with sidewalls 70% as tall as the tire is wide (200 mm), radial construction (R), for a 18 inch wheel.
285/70R18 specs
| Overall diameter (height) | 33.71 inches (856 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 7.85 inches (200 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 105.9 inches (2,690 mm) |
| Revolutions per mile | 598 |
| Revolutions per kilometer | 372 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 33.7x11.2R18 |
| Aspect ratio | 70% |
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 285/70R18 on a 18" wheel
These 18" sizes are within 3% of 285/70R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 265/75R18 | 33.65" | 10.43" | −0.2% | 59.9 mph | Compare |
| 305/65R18 | 33.61" | 12.01" | −0.3% | 59.8 mph | Compare |
| 335/60R18 | 33.83" | 13.19" | +0.4% | 60.2 mph | Compare |
| 325/60R18 | 33.35" | 12.80" | −1.1% | 59.4 mph | Compare |
| 315/65R18 | 34.12" | 12.40" | +1.2% | 60.7 mph | Compare |
| 275/75R18 | 34.24" | 10.83" | +1.6% | 60.9 mph | Compare |
| 295/70R18 | 34.26" | 11.61" | +1.6% | 61.0 mph | Compare |
| 275/70R18 | 33.16" | 10.83" | −1.6% | 59.0 mph | Compare |
| 295/65R18 | 33.10" | 11.61" | −1.8% | 58.9 mph | Compare |
| 255/75R18 | 33.06" | 10.04" | −1.9% | 58.8 mph | Compare |
| 33x12.50R18 | 33.00" | 12.50" | −2.1% | 58.7 mph | Compare |
| 315/60R18 | 32.88" | 12.40" | −2.5% | 58.5 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 265/85R16 | 16" | 33.74" | +0.1% | Compare |
| 295/55R21 | 21" | 33.78" | +0.2% | Compare |
| 315/55R20 | 20" | 33.64" | −0.2% | Compare |
| 355/35R24 | 24" | 33.78" | +0.2% | Compare |
| 325/50R21 | 21" | 33.80" | +0.3% | Compare |
| 295/50R22 | 22" | 33.61" | −0.3% | Compare |
| 305/70R17 | 17" | 33.81" | +0.3% | Compare |
| 305/40R24 | 24" | 33.61" | −0.3% | Compare |
| 285/75R17 | 17" | 33.83" | +0.4% | Compare |
| 285/65R19 | 19" | 33.59" | −0.4% | Compare |
| 345/50R20 | 20" | 33.58" | −0.4% | Compare |
| 355/45R21 | 21" | 33.58" | −0.4% | Compare |
One size up or down
- 275/70R18narrower: 33.2" × 10.8"
- 295/70R18wider: 34.3" × 11.6"
- 285/65R18lower profile: 32.6" × 11.2"
- 285/75R18taller sidewall: 34.8" × 11.2"
Compare 285/70R18 with another size
Questions
- How tall is a 285/70R18 tire?
- A 285/70R18 tire is 33.7 inches tall (856 mm), calculated from the size. It is 11.2 inches wide with 7.9 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/70R18 mean?
- 285/70R18 means a tire 285 mm wide, with sidewalls 70% as tall as the tire is wide (200 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 285/70R18 tire make?
- About 598 revolutions per mile, based on a circumference of 105.9 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/70R18 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 265/75R18 instead of 285/70R18?
- 265/75R18 is −0.06 inches (−0.2%) in overall diameter, so at an indicated 60 mph you would be doing 59.9 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.