285/65R18 tire size in inches
A 285/65R18 tire measures
32.6" tall × 11.2" wide
7.29" sidewall on a 18" wheel. 619 revolutions per mile.
285/65R18 means a tire 285 mm wide, with sidewalls 65% as tall as the tire is wide (185 mm), radial construction (R), for a 18 inch wheel.
285/65R18 specs
| Overall diameter (height) | 32.59 inches (828 mm) |
|---|---|
| Section width | 11.22 inches (285 mm) |
| Sidewall height | 7.29 inches (185 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 102.4 inches (2,600 mm) |
| Revolutions per mile | 619 |
| Revolutions per kilometer | 385 |
| Approximate rim width | 7.5" to 9.0" |
| In inches (flotation style) | 32.6x11.2R18 |
| Aspect ratio | 65% |
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 285/65R18 on a 18" wheel
These 18" sizes are within 3% of 285/65R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 265/70R18 | 32.61" | 10.43" | +0.1% | 60.0 mph | Compare |
| 335/55R18 | 32.51" | 13.19" | −0.2% | 59.9 mph | Compare |
| 245/75R18 | 32.47" | 9.65" | −0.4% | 59.8 mph | Compare |
| 305/60R18 | 32.41" | 12.01" | −0.5% | 59.7 mph | Compare |
| 315/60R18 | 32.88" | 12.40" | +0.9% | 60.5 mph | Compare |
| 33x12.50R18 | 33.00" | 12.50" | +1.3% | 60.8 mph | Compare |
| 255/75R18 | 33.06" | 10.04" | +1.4% | 60.9 mph | Compare |
| 295/65R18 | 33.10" | 11.61" | +1.6% | 60.9 mph | Compare |
| 275/65R18 | 32.07" | 10.83" | −1.6% | 59.1 mph | Compare |
| 325/55R18 | 32.07" | 12.80" | −1.6% | 59.1 mph | Compare |
| 255/70R18 | 32.06" | 10.04" | −1.6% | 59.0 mph | Compare |
| 275/70R18 | 33.16" | 10.83" | +1.8% | 61.1 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 345/50R19 | 19" | 32.58" | 0.0% | Compare |
| 355/45R20 | 20" | 32.58" | 0.0% | Compare |
| 245/55R22 | 22" | 32.61" | +0.1% | Compare |
| 265/65R19 | 19" | 32.56" | −0.1% | Compare |
| 305/65R17 | 17" | 32.61" | +0.1% | Compare |
| 295/50R21 | 21" | 32.61" | +0.1% | Compare |
| 335/40R22 | 22" | 32.55" | −0.1% | Compare |
| 245/65R20 | 20" | 32.54" | −0.1% | Compare |
| 315/55R19 | 19" | 32.64" | +0.2% | Compare |
| 265/75R17 | 17" | 32.65" | +0.2% | Compare |
| 265/60R20 | 20" | 32.52" | −0.2% | Compare |
| 325/45R21 | 21" | 32.52" | −0.2% | Compare |
One size up or down
- 275/65R18narrower: 32.1" × 10.8"
- 295/65R18wider: 33.1" × 11.6"
- 285/60R18lower profile: 31.5" × 11.2"
- 285/70R18taller sidewall: 33.7" × 11.2"
Compare 285/65R18 with another size
Questions
- How tall is a 285/65R18 tire?
- A 285/65R18 tire is 32.6 inches tall (828 mm), calculated from the size. It is 11.2 inches wide with 7.3 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 285/65R18 mean?
- 285/65R18 means a tire 285 mm wide, with sidewalls 65% as tall as the tire is wide (185 mm), radial construction (R), for a 18 inch wheel.
- How many revolutions per mile does a 285/65R18 tire make?
- About 619 revolutions per mile, based on a circumference of 102.4 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 285/65R18 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 265/70R18 instead of 285/65R18?
- 265/70R18 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.