285/65R18 tire size
285/65R18 is a metric size: 32.6" tall, 11.2" wide, on a 18" rim — about a 32.5x11.00R18. The sidewall is 7.3" and the tire turns 619 times per mile.
285/65R18 specs
| Overall diameter (height) | 32.59" · 828 mm |
|---|---|
| Section width | 11.22" · 285 mm |
| Sidewall height | 7.29" · 185 mm (65% of width) |
| Rim diameter | 18" |
| Circumference | 102.37" · 2.600 m |
| Revolutions per mile | 619 (385 per km) |
| Inch (flotation) equivalent | 32.5x11.00R18 |
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" | -1.57% | -10 mm | 59.1 mph | compare → |
| 275/70R18 common | 33.16" | +1.75% | -10 mm | 61.1 mph | compare → |
| 265/65R18 common | 31.56" | -3.14% | -20 mm | 58.1 mph | compare → |
| 265/70R18 common | 32.61" | +0.06% | -20 mm | 60.0 mph | compare → |
| 255/70R18 common | 32.06" | -1.63% | -30 mm | 59.0 mph | compare → |
| 255/65R18 common | 31.05" | -4.71% | -30 mm | 57.2 mph | compare → |
| 33x12.50R18 | 33.00" | +1.27% | +33 mm | 60.8 mph | compare → |
| 285/60R18 | 31.46" | -3.44% | 0 mm | 57.9 mph | compare → |
| 305/65R18 | 33.61" | +3.14% | +20 mm | 61.9 mph | compare → |
| 275/60R18 | 30.99" | -4.89% | -10 mm | 57.1 mph | compare → |
| 305/60R18 | 32.41" | -0.54% | +20 mm | 59.7 mph | compare → |
| 285/70R18 | 33.71" | +3.44% | 0 mm | 62.1 mph | compare → |
| 325/60R18 | 33.35" | +2.36% | +40 mm | 61.4 mph | compare → |
| 245/75R18 | 32.47" | -0.36% | -40 mm | 59.8 mph | calculate → |
| 295/65R18 | 33.10" | +1.57% | +10 mm | 60.9 mph | calculate → |
| 245/70R18 | 31.50" | -3.32% | -40 mm | 58.0 mph | calculate → |
| 235/80R18 | 32.80" | +0.66% | -50 mm | 60.4 mph | calculate → |
| 33x11.50R18 | 33.00" | +1.27% | +7 mm | 60.8 mph | calculate → |
| 33x13.50R18 | 33.00" | +1.27% | +58 mm | 60.8 mph | calculate → |
| 33x13.00R18 | 33.00" | +1.27% | +45 mm | 60.8 mph | calculate → |
| 34x12.50R18 | 34.00" | +4.34% | +33 mm | 62.6 mph | calculate → |
| 33x10.50R18 | 33.00" | +1.27% | -18 mm | 60.8 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 285/65R18
Questions
What size is 285/65R18 in inches?
285/65R18 is about 32.6" tall and 11.2" wide on a 18-inch rim — roughly a 32.5x11.00R18 in inch sizing.
What does 285/65R18 mean?
285 mm section width, sidewall 65% of the width (7.29"), radial construction, 18-inch rim.
What tire sizes are equivalent to 285/65R18?
On the same 18" rim, within 3% of the diameter: 265/70R18 (+0.06%), 245/75R18 (-0.36%), 305/60R18 (-0.54%), 235/80R18 (+0.66%), 33x10.50R18 (+1.27%), 33x11.50R18 (+1.27%).
How many revolutions per mile does a 285/65R18 tire make?
About 619 revolutions per mile (circumference 102.4").
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.