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285/60R18 tire size in inches
285/60R18 is 31.46" tall and 11.22" wide, and fits a 18" rim. In flotation (inch) sizing that is roughly 31.5x11.2R18.
285/60R18 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 31.46" | 799 mm |
| Section width | 11.22" | 285 mm |
| Sidewall height | 6.73" | 171.0 mm |
| Rim diameter | 18" | 457.2 mm |
| Circumference | 98.8" | 2511 mm |
| Revolutions per mile | 641 | |
| Aspect ratio | 60% (sidewall is 60% of the width) | |
Drawn to scale
Among the 122 sizes for 18" wheels on this site, 285/60R18 is #66 by height (shortest: 245/35R18, tallest: 340/80R18).
What people compare 285/60R18 with
Real comparisons drivers search for, worked out against 285/60R18:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 275/65R18 | +0.61" (+1.94%) | -0.39" | +0.31" | 58.9 mph |
| 275/70R18 | +1.70" (+5.4%) | -0.39" | +0.85" | 56.9 mph |
285/60R18 against the most popular 18" sizes
| Popular size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 295/70R18 | +2.80" (+8.9%) | +0.39" | +1.40" | 55.1 mph |
| 285/65R18 | +1.13" (+3.59%) | 0.00" | +0.56" | 57.9 mph |
| 305/70R18 | +3.35" (+10.65%) | +0.79" | +1.68" | 54.2 mph |
| 285/70R18 | +2.25" (+7.15%) | 0.00" | +1.12" | 56 mph |
| 285/75R18 | +3.37" (+10.71%) | 0.00" | +1.69" | 54.2 mph |
How the 285/60R18 numbers are worked out
The size code reads as 285 mm section width, 60% aspect ratio, R for radial construction and 18-inch wheel.
- Sidewall = 285 × 60% = 171.0 mm = 6.73"
- Diameter = 18" + 2 × 6.73" = 31.46"
- Circumference = π × 31.46" = 98.8"
- Revs per mile = 63,360" ÷ 98.8" = 641
Sizes that can replace 285/60R18 on a 18" wheel
Within 3% of 31.46". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 245/70R18 | 31.50" | 9.65" | +0.13% | 59.9 mph |
| 265/65R18 | 31.56" | 10.43" | +0.32% | 59.8 mph |
| 305/55R18 | 31.21" | 12.01" | -0.79% | 60.5 mph |
| 270/65R18 | 31.82" | 10.63" | +1.14% | 59.3 mph |
| 255/65R18 | 31.05" | 10.04" | -1.3% | 60.8 mph |
| 235/75R18 | 31.88" | 9.25" | +1.34% | 59.2 mph |
| 275/60R18 | 30.99" | 10.83" | -1.49% | 60.9 mph |
| 295/60R18 | 31.94" | 11.61" | +1.53% | 59.1 mph |
| 235/70R18 | 30.95" | 9.25" | -1.62% | 61 mph |
| 255/70R18 | 32.06" | 10.04" | +1.91% | 58.9 mph |
| 275/65R18 | 32.07" | 10.83" | +1.94% | 58.9 mph |
| 325/55R18 | 32.07" | 12.80" | +1.94% | 58.9 mph |
One size wider or narrower
- Narrower: 275/60R18 — 10.83" wide, 30.99" tall
- Wider: 295/60R18 — 11.61" wide, 31.94" tall
Same height on a different wheel size
- 245/85R15 15" (-0.19%)
- 295/70R15 15" (-0.64%)
- 275/75R15 15" (-0.7%)
- 265/80R15 15" (+0.73%)
- 305/70R15 15" (+1.11%)
- 285/75R15 15" (+1.18%)
- 255/80R15 15" (-1.27%)
- 255/85R15 15" (+1.94%)
- 245/80R16 16" (-0.1%)
- 280/70R16 16" (-0.1%)
Questions about 285/60R18
How tall is a 285/60R18 tire in inches?
A 285/60R18 tire is 31.46 inches (799 mm) tall: the 18-inch rim plus two sidewalls of 6.73 inches each.
Is 285/60R18 a 31 inch tire?
Yes. At 31.46 inches tall it is commonly called a 31-inch tire.
How many revolutions per mile does a 285/60R18 make?
About 641 revolutions per mile, based on a calculated circumference of 98.8 inches.
What size can replace 285/60R18?
245/70R18 is the closest match on a 18" rim (+0.13% height). Check load index, speed rating and clearance first.
Compare 285/60R18 against any other size with the tire size calculator.