325/40R22 tire size
325/40R22 is a metric size: 32.2" tall, 12.8" wide, on a 22" rim — about a 32x13.00R22. The sidewall is 5.1" and the tire turns 626 times per mile.
325/40R22 specs
| Overall diameter (height) | 32.24" · 819 mm |
|---|---|
| Section width | 12.80" · 325 mm |
| Sidewall height | 5.12" · 130 mm (40% of width) |
| Rim diameter | 22" |
| Circumference | 101.27" · 2.572 m |
| Revolutions per mile | 626 (389 per km) |
| Inch (flotation) equivalent | 32x13.00R22 |
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" | -0.43% | -40 mm | 59.7 mph | calculate → |
| 275/50R22 common | 32.83" | +1.83% | -50 mm | 61.1 mph | calculate → |
| 275/40R22 | 30.66" | -4.89% | -50 mm | 57.1 mph | calculate → |
| 285/40R22 | 30.98" | -3.91% | -40 mm | 57.7 mph | calculate → |
| 305/45R22 | 32.81" | +1.77% | -20 mm | 61.1 mph | calculate → |
| 33x12.50R22 | 33.00" | +2.37% | -7 mm | 61.4 mph | calculate → |
| 275/45R22 | 31.74" | -1.53% | -50 mm | 59.1 mph | calculate → |
| 305/40R22 | 31.61" | -1.95% | -20 mm | 58.8 mph | calculate → |
| 325/35R22 | 30.96" | -3.97% | 0 mm | 57.6 mph | calculate → |
| 315/35R22 | 30.68" | -4.82% | -10 mm | 57.1 mph | calculate → |
| 295/40R22 | 31.29" | -2.93% | -30 mm | 58.2 mph | calculate → |
| 285/50R22 | 33.22" | +3.05% | -40 mm | 61.8 mph | calculate → |
| 255/45R22 | 31.04" | -3.72% | -70 mm | 57.8 mph | calculate → |
| 295/50R22 | 33.61" | +4.27% | -30 mm | 62.6 mph | calculate → |
| 265/50R22 | 32.43" | +0.61% | -60 mm | 60.4 mph | calculate → |
| 315/45R22 | 33.16" | +2.87% | -10 mm | 61.7 mph | calculate → |
| 355/40R22 | 33.18" | +2.93% | +30 mm | 61.8 mph | calculate → |
| 33x13.50R22 | 33.00" | +2.37% | +18 mm | 61.4 mph | calculate → |
| 33x14.50R22 | 33.00" | +2.37% | +43 mm | 61.4 mph | calculate → |
| 265/45R22 | 31.39" | -2.63% | -60 mm | 58.4 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 | |
|---|---|---|---|---|---|
| 285/40R23 | 31.98" | -0.81% | -40 mm | 59.5 mph | calculate → |
| 325/35R23 | 31.96" | -0.87% | 0 mm | 59.5 mph | calculate → |
| 315/45R21 | 32.16" | -0.23% | -10 mm | 59.9 mph | calculate → |
Try another size against 325/40R22
Questions
What size is 325/40R22 in inches?
325/40R22 is about 32.2" tall and 12.8" wide on a 22-inch rim — roughly a 32x13.00R22 in inch sizing.
What does 325/40R22 mean?
325 mm section width, sidewall 40% of the width (5.12"), radial construction, 22-inch rim.
What tire sizes are equivalent to 325/40R22?
On the same 22" rim, within 3% of the diameter: 285/45R22 (-0.43%), 265/50R22 (+0.61%), 275/45R22 (-1.53%), 305/45R22 (+1.77%), 275/50R22 (+1.83%), 305/40R22 (-1.95%).
How many revolutions per mile does a 325/40R22 tire make?
About 626 revolutions per mile (circumference 101.3").
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.