255/45R22 tire size
255/45R22 is a metric size: 31.0" tall, 10.0" wide, on a 22" rim — about a 31x10.00R22. The sidewall is 4.5" and the tire turns 650 times per mile.
255/45R22 specs
| Overall diameter (height) | 31.04" · 788 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 4.52" · 115 mm (45% of width) |
| Rim diameter | 22" |
| Circumference | 97.50" · 2.477 m |
| Revolutions per mile | 650 (404 per km) |
| Inch (flotation) equivalent | 31x10.00R22 |
Equivalent sizes on a 22" 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 | |
|---|---|---|---|---|---|
| 285/45R22 common | 32.10" | +3.43% | +30 mm | 62.1 mph | calculate → |
| 275/40R22 | 30.66" | -1.21% | +20 mm | 59.3 mph | calculate → |
| 265/40R22 | 30.35" | -2.22% | +10 mm | 58.7 mph | calculate → |
| 285/35R22 | 29.85" | -3.81% | +30 mm | 57.7 mph | calculate → |
| 285/40R22 | 30.98" | -0.19% | +30 mm | 59.9 mph | calculate → |
| 275/45R22 | 31.74" | +2.28% | +20 mm | 61.4 mph | calculate → |
| 305/40R22 | 31.61" | +1.84% | +50 mm | 61.1 mph | calculate → |
| 275/35R22 | 29.58" | -4.69% | +20 mm | 57.2 mph | calculate → |
| 325/35R22 | 30.96" | -0.25% | +70 mm | 59.8 mph | calculate → |
| 315/35R22 | 30.68" | -1.14% | +60 mm | 59.3 mph | calculate → |
| 295/35R22 | 30.13" | -2.92% | +40 mm | 58.2 mph | calculate → |
| 295/40R22 | 31.29" | +0.82% | +40 mm | 60.5 mph | calculate → |
| 255/40R22 | 30.03" | -3.23% | 0 mm | 58.1 mph | calculate → |
| 325/40R22 | 32.24" | +3.87% | +70 mm | 62.3 mph | calculate → |
| 265/50R22 | 32.43" | +4.50% | +10 mm | 62.7 mph | calculate → |
| 305/35R22 | 30.41" | -2.03% | +50 mm | 58.8 mph | calculate → |
| 325/30R22 | 29.68" | -4.38% | +70 mm | 57.4 mph | calculate → |
| 265/45R22 | 31.39" | +1.14% | +10 mm | 60.7 mph | calculate → |
Plus / minus sizing: 21" and 23" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 275/45R21 | 30.74" | -0.94% | +20 mm | 59.4 mph | calculate → |
| 285/45R21 | 31.10" | +0.20% | +30 mm | 60.1 mph | calculate → |
| 315/40R21 | 30.92" | -0.37% | +60 mm | 59.8 mph | calculate → |
| 255/50R21 | 31.04" | +0.01% | 0 mm | 60.0 mph | calculate → |
| 285/35R23 | 30.85" | -0.58% | +30 mm | 59.6 mph | calculate → |
| 295/35R23 | 31.13" | +0.30% | +40 mm | 60.2 mph | calculate → |
| 255/40R23 | 31.03" | -0.01% | 0 mm | 60.0 mph | calculate → |
| 335/30R23 | 30.91" | -0.39% | +80 mm | 59.8 mph | calculate → |
| 325/40R21 | 31.24" | +0.65% | +70 mm | 60.4 mph | calculate → |
Try another size against 255/45R22
Questions
What size is 255/45R22 in inches?
255/45R22 is about 31.0" tall and 10.0" wide on a 22-inch rim — roughly a 31x10.00R22 in inch sizing.
What does 255/45R22 mean?
255 mm section width, sidewall 45% of the width (4.52"), radial construction, 22-inch rim.
What tire sizes are equivalent to 255/45R22?
On the same 22" rim, within 3% of the diameter: 285/40R22 (-0.19%), 325/35R22 (-0.25%), 295/40R22 (+0.82%), 315/35R22 (-1.14%), 265/45R22 (+1.14%), 275/40R22 (-1.21%).
How many revolutions per mile does a 255/45R22 tire make?
About 650 revolutions per mile (circumference 97.5").
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.