285/45R18 tire size
285/45R18 is a metric size: 28.1" tall, 11.2" wide, on a 18" rim — about a 28x11.00R18. The sidewall is 5.0" and the tire turns 718 times per mile.
285/45R18 specs
| Overall diameter (height) | 28.10" · 714 mm |
|---|---|
| Section width | 11.22" · 285 mm |
| Sidewall height | 5.05" · 128 mm (45% of width) |
| Rim diameter | 18" |
| Circumference | 88.27" · 2.242 m |
| Revolutions per mile | 718 (446 per km) |
| Inch (flotation) equivalent | 28x11.00R18 |
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 | |
|---|---|---|---|---|---|
| 235/60R18 common | 29.10" | +3.57% | -50 mm | 62.1 mph | calculate → |
| 235/50R18 common | 27.25" | -3.01% | -50 mm | 58.2 mph | calculate → |
| 235/55R18 common | 28.18" | +0.28% | -50 mm | 60.2 mph | calculate → |
| 225/60R18 common | 28.63" | +1.89% | -60 mm | 61.1 mph | calculate → |
| 225/50R18 common | 26.86" | -4.41% | -60 mm | 57.4 mph | calculate → |
| 225/55R18 common | 27.74" | -1.26% | -60 mm | 59.2 mph | calculate → |
| 255/55R18 common | 29.04" | +3.36% | -30 mm | 62.0 mph | calculate → |
| 245/50R18 common | 27.65" | -1.61% | -40 mm | 59.0 mph | calculate → |
| 255/45R18 common | 27.04" | -3.78% | -30 mm | 57.7 mph | calculate → |
| 215/55R18 common | 27.31" | -2.80% | -70 mm | 58.3 mph | calculate → |
| 245/55R18 | 28.61" | +1.82% | -40 mm | 61.1 mph | calculate → |
| 275/45R18 | 27.74" | -1.26% | -10 mm | 59.2 mph | calculate → |
| 265/45R18 | 27.39" | -2.52% | -20 mm | 58.5 mph | calculate → |
| 295/40R18 | 27.29" | -2.87% | +10 mm | 58.3 mph | calculate → |
| 285/40R18 | 26.98" | -3.99% | 0 mm | 57.6 mph | calculate → |
| 345/35R18 | 27.51" | -2.10% | +60 mm | 58.7 mph | calculate → |
| 295/45R18 | 28.45" | +1.26% | +10 mm | 60.8 mph | calculate → |
| 255/50R18 | 28.04" | -0.21% | -30 mm | 59.9 mph | calculate → |
| 315/40R18 | 27.92" | -0.63% | +30 mm | 59.6 mph | calculate → |
| 155/90R18 | 28.98" | +3.15% | -130 mm | 61.9 mph | calculate → |
| 215/60R18 | 28.16" | +0.21% | -70 mm | 60.1 mph | calculate → |
| 155/85R18 | 28.37" | +0.98% | -130 mm | 60.6 mph | calculate → |
| 305/40R18 | 27.61" | -1.75% | +20 mm | 58.9 mph | calculate → |
| 305/45R18 | 28.81" | +2.52% | +20 mm | 61.5 mph | calculate → |
| 285/50R18 | 29.22" | +3.99% | 0 mm | 62.4 mph | calculate → |
| 28x12.00R18 | 28.00" | -0.35% | +20 mm | 59.8 mph | calculate → |
| 145/85R18 | 27.70" | -1.40% | -140 mm | 59.2 mph | calculate → |
| 145/80R18 | 27.13" | -3.43% | -140 mm | 57.9 mph | calculate → |
| 165/70R18 | 27.09" | -3.57% | -120 mm | 57.9 mph | calculate → |
| 325/35R18 | 26.96" | -4.06% | +40 mm | 57.6 mph | calculate → |
| 28x10.00R18 | 28.00" | -0.35% | -31 mm | 59.8 mph | calculate → |
| 265/50R18 | 28.43" | +1.19% | -20 mm | 60.7 mph | calculate → |
| 205/60R18 | 27.69" | -1.47% | -80 mm | 59.1 mph | calculate → |
| 195/60R18 | 27.21" | -3.15% | -90 mm | 58.1 mph | calculate → |
| 265/55R18 | 29.48" | +4.90% | -20 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.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 255/45R19 common | 28.04" | -0.22% | -30 mm | 59.9 mph | calculate → |
| 235/60R17 common | 28.10" | +0.01% | -50 mm | 60.0 mph | calculate → |
| 215/65R17 common | 28.00" | -0.34% | -70 mm | 59.8 mph | calculate → |
| 235/50R19 common | 28.25" | +0.55% | -50 mm | 60.3 mph | calculate → |
| 285/40R19 | 27.98" | -0.43% | 0 mm | 59.7 mph | calculate → |
| 295/40R19 | 28.29" | +0.69% | +10 mm | 60.4 mph | calculate → |
| 255/55R17 | 28.04" | -0.20% | -30 mm | 59.9 mph | calculate → |
| 155/90R17 | 27.98" | -0.41% | -130 mm | 59.8 mph | calculate → |
| 28x6.00R17 | 28.00" | -0.35% | -133 mm | 59.8 mph | calculate → |
| 275/50R17 | 27.83" | -0.97% | -10 mm | 59.4 mph | calculate → |
| 145/80R19 | 28.13" | +0.13% | -140 mm | 60.1 mph | calculate → |
| 345/40R17 | 27.87" | -0.83% | +60 mm | 59.5 mph | calculate → |
| 225/50R19 | 27.86" | -0.85% | -60 mm | 59.5 mph | calculate → |
Try another size against 285/45R18
Questions
What size is 285/45R18 in inches?
285/45R18 is about 28.1" tall and 11.2" wide on a 18-inch rim — roughly a 28x11.00R18 in inch sizing.
What does 285/45R18 mean?
285 mm section width, sidewall 45% of the width (5.05"), radial construction, 18-inch rim.
What tire sizes are equivalent to 285/45R18?
On the same 18" rim, within 3% of the diameter: 215/60R18 (+0.21%), 255/50R18 (-0.21%), 235/55R18 (+0.28%), 28x10.00R18 (-0.35%), 28x12.00R18 (-0.35%), 315/40R18 (-0.63%).
How many revolutions per mile does a 285/45R18 tire make?
About 718 revolutions per mile (circumference 88.3").
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.