285/60R18 tire size
285/60R18 is a metric size: 31.5" tall, 11.2" wide, on a 18" rim — about a 31.5x11.00R18. The sidewall is 6.7" and the tire turns 641 times per mile.
285/60R18 specs
| Overall diameter (height) | 31.46" · 799 mm |
|---|---|
| Section width | 11.22" · 285 mm |
| Sidewall height | 6.73" · 171 mm (60% of width) |
| Rim diameter | 18" |
| Circumference | 98.85" · 2.511 m |
| Revolutions per mile | 641 (398 per km) |
| Inch (flotation) equivalent | 31.5x11.00R18 |
Equivalent sizes on a 18" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/65R18 common | 32.07" | +1.94% | -10 mm | 61.2 mph | compare → |
| 265/60R18 common | 30.52" | -3.00% | -20 mm | 58.2 mph | compare → |
| 265/65R18 common | 31.56" | +0.31% | -20 mm | 60.2 mph | compare → |
| 265/70R18 common | 32.61" | +3.63% | -20 mm | 62.2 mph | compare → |
| 235/65R18 common | 30.03" | -4.57% | -50 mm | 57.3 mph | compare → |
| 255/70R18 common | 32.06" | +1.88% | -30 mm | 61.1 mph | compare → |
| 255/65R18 common | 31.05" | -1.31% | -30 mm | 59.2 mph | compare → |
| 285/65R18 common | 32.59" | +3.57% | 0 mm | 62.1 mph | compare → |
| 255/60R18 | 30.05" | -4.50% | -30 mm | 57.3 mph | compare → |
| 33x12.50R18 | 33.00" | +4.88% | +33 mm | 62.9 mph | compare → |
| 275/60R18 | 30.99" | -1.50% | -10 mm | 59.1 mph | compare → |
| 305/60R18 | 32.41" | +3.00% | +20 mm | 61.8 mph | compare → |
| 245/75R18 | 32.47" | +3.19% | -40 mm | 61.9 mph | calculate → |
| 245/70R18 | 31.50" | +0.13% | -40 mm | 60.1 mph | calculate → |
| 235/70R18 | 30.95" | -1.63% | -50 mm | 59.0 mph | calculate → |
| 245/65R18 | 30.54" | -2.94% | -40 mm | 58.2 mph | calculate → |
| 175/90R18 | 30.40" | -3.38% | -110 mm | 58.0 mph | calculate → |
| 285/55R18 | 30.34" | -3.57% | 0 mm | 57.9 mph | calculate → |
| 235/80R18 | 32.80" | +4.25% | -50 mm | 62.6 mph | calculate → |
| 33x11.50R18 | 33.00" | +4.88% | +7 mm | 62.9 mph | calculate → |
| 33x13.50R18 | 33.00" | +4.88% | +58 mm | 62.9 mph | calculate → |
| 33x13.00R18 | 33.00" | +4.88% | +45 mm | 62.9 mph | calculate → |
| 275/55R18 | 29.91" | -4.94% | -10 mm | 57.0 mph | calculate → |
| 33x10.50R18 | 33.00" | +4.88% | -18 mm | 62.9 mph | calculate → |
Plus / minus sizing: 17" and 19" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
Try another size against 285/60R18
Questions
What size is 285/60R18 in inches?
285/60R18 is about 31.5" tall and 11.2" wide on a 18-inch rim — roughly a 31.5x11.00R18 in inch sizing.
What does 285/60R18 mean?
285 mm section width, sidewall 60% of the width (6.73"), radial construction, 18-inch rim.
What tire sizes are equivalent to 285/60R18?
On the same 18" rim, within 3% of the diameter: 245/70R18 (+0.13%), 265/65R18 (+0.31%), 255/65R18 (-1.31%), 275/60R18 (-1.50%), 235/70R18 (-1.63%), 255/70R18 (+1.88%).
How many revolutions per mile does a 285/60R18 tire make?
About 641 revolutions per mile (circumference 98.8").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.