Home › 18" tire sizes › 285/65R18
285/65R18 tire size in inches
285/65R18 is 32.59" tall and 11.22" wide, and fits a 18" rim. In flotation (inch) sizing that is roughly 32.6x11.2R18.
285/65R18 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 32.59" | 828 mm |
| Section width | 11.22" | 285 mm |
| Sidewall height | 7.29" | 185.2 mm |
| Rim diameter | 18" | 457.2 mm |
| Circumference | 102.4" | 2600 mm |
| Revolutions per mile | 619 | |
| Aspect ratio | 65% (sidewall is 65% of the width) | |
Drawn to scale
Among the 122 sizes for 18" wheels on this site, 285/65R18 is #78 by height (shortest: 245/35R18, tallest: 340/80R18).
What people compare 285/65R18 with
Real comparisons drivers search for, worked out against 285/65R18:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/70R18 | +0.57" (+1.75%) | -0.39" | +0.29" | 59 mph |
| 275/65R18 | -0.52" (-1.6%) | -0.39" | -0.25" | 61 mph |
| 265/65R18 | -1.03" (-3.16%) | -0.79" | -0.51" | 62 mph |
| 285/70R18 | +1.12" (+3.44%) | 0.00" | +0.56" | 58 mph |
| 265/70R18 | +0.02" (+0.06%) | -0.79" | +0.01" | 60 mph |
| 285/70R17 | +0.12" (+0.37%) | 0.00" | +0.56" | 59.8 mph |
| 295/70R18 | +1.67" (+5.12%) | +0.39" | +0.84" | 57.1 mph |
How the 285/65R18 numbers are worked out
The size code reads as 285 mm section width, 65% aspect ratio, R for radial construction and 18-inch wheel.
- Sidewall = 285 × 65% = 185.2 mm = 7.29"
- Diameter = 18" + 2 × 7.29" = 32.59"
- Circumference = π × 32.59" = 102.4"
- Revs per mile = 63,360" ÷ 102.4" = 619
Sizes that can replace 285/65R18 on a 18" wheel
Within 3% of 32.59". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 265/70R18 | 32.61" | 10.43" | +0.06% | 60 mph |
| 245/75R18 | 32.47" | 9.65" | -0.37% | 60.2 mph |
| 375/50R18 | 32.76" | 14.76" | +0.52% | 59.7 mph |
| 305/60R18 | 32.41" | 12.01" | -0.55% | 60.3 mph |
| 235/80R18 | 32.80" | 9.25" | +0.64% | 59.6 mph |
| 280/65R18 | 32.33" | 11.02" | -0.8% | 60.5 mph |
| 270/70R18 | 32.88" | 10.63" | +0.89% | 59.5 mph |
| 315/60R18 | 32.88" | 12.40" | +0.89% | 59.5 mph |
| 255/75R18 | 33.06" | 10.04" | +1.44% | 59.1 mph |
| 295/65R18 | 33.10" | 11.61" | +1.56% | 59.1 mph |
| 275/65R18 | 32.07" | 10.83" | -1.6% | 61 mph |
| 325/55R18 | 32.07" | 12.80" | -1.6% | 61 mph |
One size wider or narrower
Same height on a different wheel size
- 265/85R15 15" (+0.46%)
- 295/75R15 15" (-0.52%)
- 315/70R15 15" (-0.71%)
- 305/75R15 15" (+1.29%)
- 255/85R15 15" (-1.6%)
- 280/75R16 16" (-0.15%)
- 265/80R16 16" (+0.31%)
- 245/85R16 16" (-0.58%)
- 305/70R16 16" (+0.68%)
- 285/75R16 16" (+0.74%)
Questions about 285/65R18
How tall is a 285/65R18 tire in inches?
A 285/65R18 tire is 32.59 inches (828 mm) tall: the 18-inch rim plus two sidewalls of 7.29 inches each.
Is 285/65R18 a 33 inch tire?
Yes. At 32.59 inches tall it is commonly called a 33-inch tire.
How many revolutions per mile does a 285/65R18 make?
About 619 revolutions per mile, based on a calculated circumference of 102.4 inches.
What size can replace 285/65R18?
265/70R18 is the closest match on a 18" rim (+0.06% height). Check load index, speed rating and clearance first.
Compare 285/65R18 against any other size with the tire size calculator.