305/45R22 tire size
305/45R22 is a metric size: 32.8" tall, 12.0" wide, on a 22" rim — about a 33x12.00R22. The sidewall is 5.4" and the tire turns 615 times per mile.
305/45R22 specs
| Overall diameter (height) | 32.81" · 833 mm |
|---|---|
| Section width | 12.01" · 305 mm |
| Sidewall height | 5.40" · 137 mm (45% of width) |
| Rim diameter | 22" |
| Circumference | 103.07" · 2.618 m |
| Revolutions per mile | 615 (382 per km) |
| Inch (flotation) equivalent | 33x12.00R22 |
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" | -2.16% | -20 mm | 58.7 mph | compare → |
| 275/50R22 common | 32.83" | +0.06% | -30 mm | 60.0 mph | compare → |
| 33x12.50R22 | 33.00" | +0.59% | +13 mm | 60.4 mph | compare → |
| 275/45R22 | 31.74" | -3.24% | -30 mm | 58.1 mph | compare → |
| 305/40R22 | 31.61" | -3.66% | 0 mm | 57.8 mph | compare → |
| 285/55R22 | 34.34" | +4.68% | -20 mm | 62.8 mph | compare → |
| 285/50R22 | 33.22" | +1.26% | -20 mm | 60.8 mph | compare → |
| 295/40R22 | 31.29" | -4.62% | -10 mm | 57.2 mph | compare → |
| 325/40R22 | 32.24" | -1.74% | +20 mm | 59.0 mph | calculate → |
| 295/50R22 | 33.61" | +2.46% | -10 mm | 61.5 mph | calculate → |
| 265/50R22 | 32.43" | -1.14% | -40 mm | 59.3 mph | calculate → |
| 315/45R22 | 33.16" | +1.08% | +10 mm | 60.6 mph | calculate → |
| 355/40R22 | 33.18" | +1.14% | +50 mm | 60.7 mph | calculate → |
| 305/50R22 | 34.01" | +3.66% | 0 mm | 62.2 mph | calculate → |
| 33x13.50R22 | 33.00" | +0.59% | +38 mm | 60.4 mph | calculate → |
| 33x14.50R22 | 33.00" | +0.59% | +63 mm | 60.4 mph | calculate → |
| 265/45R22 | 31.39" | -4.32% | -40 mm | 57.4 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 | |
|---|---|---|---|---|---|
| 305/40R23 | 32.61" | -0.61% | 0 mm | 59.6 mph | calculate → |
| 275/55R21 | 32.91" | +0.31% | -30 mm | 60.2 mph | calculate → |
Try another size against 305/45R22
Questions
What size is 305/45R22 in inches?
305/45R22 is about 32.8" tall and 12.0" wide on a 22-inch rim — roughly a 33x12.00R22 in inch sizing.
What does 305/45R22 mean?
305 mm section width, sidewall 45% of the width (5.40"), radial construction, 22-inch rim.
What tire sizes are equivalent to 305/45R22?
On the same 22" rim, within 3% of the diameter: 275/50R22 (+0.06%), 33x12.50R22 (+0.59%), 33x13.50R22 (+0.59%), 33x14.50R22 (+0.59%), 315/45R22 (+1.08%), 265/50R22 (-1.14%).
How many revolutions per mile does a 305/45R22 tire make?
About 615 revolutions per mile (circumference 103.1").
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.