265/55R18 tire size
265/55R18 is a metric size: 29.5" tall, 10.4" wide, on a 18" rim — about a 29.5x10.50R18. The sidewall is 5.7" and the tire turns 684 times per mile.
265/55R18 specs
| Overall diameter (height) | 29.48" · 749 mm |
|---|---|
| Section width | 10.43" · 265 mm |
| Sidewall height | 5.74" · 146 mm (55% of width) |
| Rim diameter | 18" |
| Circumference | 92.60" · 2.352 m |
| Revolutions per mile | 684 (425 per km) |
| Inch (flotation) equivalent | 29.5x10.50R18 |
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" | -1.27% | -30 mm | 59.2 mph | calculate → |
| 235/55R18 common | 28.18" | -4.41% | -30 mm | 57.4 mph | calculate → |
| 265/60R18 common | 30.52" | +3.54% | 0 mm | 62.1 mph | calculate → |
| 225/60R18 common | 28.63" | -2.87% | -40 mm | 58.3 mph | calculate → |
| 245/60R18 common | 29.57" | +0.33% | -20 mm | 60.2 mph | calculate → |
| 255/55R18 common | 29.04" | -1.47% | -10 mm | 59.1 mph | calculate → |
| 235/65R18 common | 30.03" | +1.87% | -30 mm | 61.1 mph | calculate → |
| 255/60R18 | 30.05" | +1.94% | -10 mm | 61.2 mph | calculate → |
| 245/55R18 | 28.61" | -2.94% | -20 mm | 58.2 mph | calculate → |
| 295/45R18 | 28.45" | -3.47% | +30 mm | 57.9 mph | calculate → |
| 255/50R18 | 28.04" | -4.88% | -10 mm | 57.1 mph | calculate → |
| 155/90R18 | 28.98" | -1.67% | -110 mm | 59.0 mph | calculate → |
| 165/90R18 | 29.69" | +0.73% | -100 mm | 60.4 mph | calculate → |
| 285/50R18 | 29.22" | -0.87% | +20 mm | 59.5 mph | calculate → |
| 305/45R18 | 28.81" | -2.27% | +40 mm | 58.6 mph | calculate → |
| 155/85R18 | 28.37" | -3.74% | -110 mm | 57.8 mph | calculate → |
| 215/60R18 | 28.16" | -4.47% | -50 mm | 57.3 mph | calculate → |
| 325/45R18 | 29.52" | +0.13% | +60 mm | 60.1 mph | calculate → |
| 275/55R18 | 29.91" | +1.47% | +10 mm | 60.9 mph | calculate → |
| 285/55R18 | 30.34" | +2.94% | +20 mm | 61.8 mph | calculate → |
| 175/90R18 | 30.40" | +3.14% | -90 mm | 61.9 mph | calculate → |
| 245/65R18 | 30.54" | +3.61% | -20 mm | 62.2 mph | calculate → |
| 285/45R18 | 28.10" | -4.67% | +20 mm | 57.2 mph | calculate → |
| 225/65R18 | 29.52" | +0.13% | -40 mm | 60.1 mph | calculate → |
| 265/50R18 | 28.43" | -3.54% | 0 mm | 57.9 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 | |
|---|---|---|---|---|---|
| 245/65R17 common | 29.54" | +0.21% | -20 mm | 60.1 mph | calculate → |
| 245/55R19 common | 29.61" | +0.45% | -20 mm | 60.3 mph | calculate → |
| 265/50R19 common | 29.43" | -0.15% | 0 mm | 59.9 mph | calculate → |
| 265/60R17 | 29.52" | +0.15% | 0 mm | 60.1 mph | calculate → |
| 295/45R19 | 29.45" | -0.08% | +30 mm | 60.0 mph | calculate → |
| 175/90R17 | 29.40" | -0.25% | -90 mm | 59.8 mph | calculate → |
| 225/70R17 | 29.40" | -0.25% | -40 mm | 59.8 mph | calculate → |
Try another size against 265/55R18
Questions
What size is 265/55R18 in inches?
265/55R18 is about 29.5" tall and 10.4" wide on a 18-inch rim — roughly a 29.5x10.50R18 in inch sizing.
What does 265/55R18 mean?
265 mm section width, sidewall 55% of the width (5.74"), radial construction, 18-inch rim.
What tire sizes are equivalent to 265/55R18?
On the same 18" rim, within 3% of the diameter: 225/65R18 (+0.13%), 325/45R18 (+0.13%), 245/60R18 (+0.33%), 165/90R18 (+0.73%), 285/50R18 (-0.87%), 235/60R18 (-1.27%).
How many revolutions per mile does a 265/55R18 tire make?
About 684 revolutions per mile (circumference 92.6").
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.