255/40R22 tire size
255/40R22 is a metric size: 30.0" tall, 10.0" wide, on a 22" rim — about a 30x10.00R22. The sidewall is 4.0" and the tire turns 672 times per mile.
255/40R22 specs
| Overall diameter (height) | 30.03" · 763 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 4.02" · 102 mm (40% of width) |
| Rim diameter | 22" |
| Circumference | 94.35" · 2.396 m |
| Revolutions per mile | 672 (417 per km) |
| Inch (flotation) equivalent | 30x10.00R22 |
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 | |
|---|---|---|---|---|---|
| 275/40R22 | 30.66" | +2.10% | +20 mm | 61.3 mph | compare → |
| 265/40R22 | 30.35" | +1.05% | +10 mm | 60.6 mph | compare → |
| 265/35R22 | 29.30" | -2.43% | +10 mm | 58.5 mph | compare → |
| 285/35R22 | 29.85" | -0.59% | +30 mm | 59.6 mph | compare → |
| 285/40R22 | 30.98" | +3.15% | +30 mm | 61.9 mph | compare → |
| 275/35R22 | 29.58" | -1.51% | +20 mm | 59.1 mph | compare → |
| 295/35R22 | 30.13" | +0.33% | +40 mm | 60.2 mph | compare → |
| 315/35R22 | 30.68" | +2.16% | +60 mm | 61.3 mph | compare → |
| 325/35R22 | 30.96" | +3.08% | +70 mm | 61.8 mph | compare → |
| 285/30R22 | 28.73" | -4.33% | +30 mm | 57.4 mph | compare → |
| 295/30R22 | 28.97" | -3.54% | +40 mm | 57.9 mph | compare → |
| 315/30R22 | 29.44" | -1.97% | +60 mm | 58.8 mph | compare → |
| 295/40R22 | 31.29" | +4.20% | +40 mm | 62.5 mph | compare → |
| 255/45R22 | 31.04" | +3.34% | 0 mm | 62.0 mph | calculate → |
| 255/35R22 | 29.03" | -3.34% | 0 mm | 58.0 mph | calculate → |
| 335/25R22 | 28.59" | -4.79% | +80 mm | 57.1 mph | calculate → |
| 305/35R22 | 30.41" | +1.25% | +50 mm | 60.7 mph | calculate → |
| 325/30R22 | 29.68" | -1.18% | +70 mm | 59.3 mph | calculate → |
| 305/30R22 | 29.20" | -2.75% | +50 mm | 58.3 mph | calculate → |
| 355/25R22 | 28.99" | -3.47% | +100 mm | 57.9 mph | calculate → |
| 265/45R22 | 31.39" | +4.52% | +10 mm | 62.7 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 | |
|---|---|---|---|---|---|
| 295/40R21 | 30.29" | +0.87% | +40 mm | 60.5 mph | compare → |
| 285/40R21 | 29.98" | -0.18% | +30 mm | 59.9 mph | compare → |
| 255/45R21 | 30.04" | +0.01% | 0 mm | 60.0 mph | compare → |
| 235/50R21 | 30.25" | +0.73% | -20 mm | 60.4 mph | calculate → |
| 295/30R23 | 29.97" | -0.21% | +40 mm | 59.9 mph | calculate → |
Try another size against 255/40R22
Questions
What size is 255/40R22 in inches?
255/40R22 is about 30.0" tall and 10.0" wide on a 22-inch rim — roughly a 30x10.00R22 in inch sizing.
What does 255/40R22 mean?
255 mm section width, sidewall 40% of the width (4.02"), radial construction, 22-inch rim.
What tire sizes are equivalent to 255/40R22?
On the same 22" rim, within 3% of the diameter: 295/35R22 (+0.33%), 285/35R22 (-0.59%), 265/40R22 (+1.05%), 325/30R22 (-1.18%), 305/35R22 (+1.25%), 275/35R22 (-1.51%).
How many revolutions per mile does a 255/40R22 tire make?
About 672 revolutions per mile (circumference 94.3").
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.