305/30R22 tire size
305/30R22 is a metric size: 29.2" tall, 12.0" wide, on a 22" rim — about a 29x12.00R22. The sidewall is 3.6" and the tire turns 691 times per mile.
305/30R22 specs
| Overall diameter (height) | 29.20" · 742 mm |
|---|---|
| Section width | 12.01" · 305 mm |
| Sidewall height | 3.60" · 92 mm (30% of width) |
| Rim diameter | 22" |
| Circumference | 91.75" · 2.330 m |
| Revolutions per mile | 691 (429 per km) |
| Inch (flotation) equivalent | 29x12.00R22 |
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" | +4.99% | -30 mm | 63.0 mph | calculate → |
| 265/40R22 | 30.35" | +3.91% | -40 mm | 62.3 mph | calculate → |
| 265/35R22 | 29.30" | +0.34% | -40 mm | 60.2 mph | calculate → |
| 285/35R22 | 29.85" | +2.22% | -20 mm | 61.3 mph | calculate → |
| 275/35R22 | 29.58" | +1.28% | -30 mm | 60.8 mph | calculate → |
| 295/35R22 | 30.13" | +3.17% | -10 mm | 61.9 mph | calculate → |
| 285/30R22 | 28.73" | -1.62% | -20 mm | 59.0 mph | calculate → |
| 295/30R22 | 28.97" | -0.81% | -10 mm | 59.5 mph | calculate → |
| 315/30R22 | 29.44" | +0.81% | +10 mm | 60.5 mph | calculate → |
| 255/40R22 | 30.03" | +2.83% | -50 mm | 61.7 mph | calculate → |
| 265/30R22 | 28.26" | -3.24% | -40 mm | 58.1 mph | calculate → |
| 255/30R22 | 28.02" | -4.04% | -50 mm | 57.6 mph | calculate → |
| 295/25R22 | 27.81" | -4.79% | -10 mm | 57.1 mph | calculate → |
| 255/35R22 | 29.03" | -0.61% | -50 mm | 59.6 mph | calculate → |
| 335/25R22 | 28.59" | -2.09% | +30 mm | 58.7 mph | calculate → |
| 245/30R22 | 27.79" | -4.85% | -60 mm | 57.1 mph | calculate → |
| 305/35R22 | 30.41" | +4.11% | 0 mm | 62.5 mph | calculate → |
| 315/25R22 | 28.20" | -3.44% | +10 mm | 57.9 mph | calculate → |
| 355/25R22 | 28.99" | -0.74% | +50 mm | 59.6 mph | calculate → |
| 325/30R22 | 29.68" | +1.62% | +20 mm | 61.0 mph | calculate → |
| 275/30R22 | 28.50" | -2.43% | -30 mm | 58.5 mph | calculate → |
| 305/25R22 | 28.00" | -4.11% | 0 mm | 57.5 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 | |
|---|---|---|---|---|---|
| 265/40R21 common | 29.35" | +0.49% | -40 mm | 60.3 mph | calculate → |
| 295/35R21 | 29.13" | -0.26% | -10 mm | 59.8 mph | calculate → |
| 255/40R21 | 29.03" | -0.59% | -50 mm | 59.6 mph | calculate → |
| 235/45R21 | 29.33" | +0.42% | -70 mm | 60.3 mph | calculate → |
| 305/35R21 | 29.41" | +0.69% | 0 mm | 60.4 mph | calculate → |
| 335/30R21 | 28.91" | -1.00% | +30 mm | 59.4 mph | calculate → |
| 345/30R21 | 29.15" | -0.19% | +40 mm | 59.9 mph | calculate → |
| 225/45R21 | 28.97" | -0.80% | -80 mm | 59.5 mph | calculate → |
| 315/25R23 | 29.20" | -0.01% | +10 mm | 60.0 mph | calculate → |
Try another size against 305/30R22
Questions
What size is 305/30R22 in inches?
305/30R22 is about 29.2" tall and 12.0" wide on a 22-inch rim — roughly a 29x12.00R22 in inch sizing.
What does 305/30R22 mean?
305 mm section width, sidewall 30% of the width (3.60"), radial construction, 22-inch rim.
What tire sizes are equivalent to 305/30R22?
On the same 22" rim, within 3% of the diameter: 265/35R22 (+0.34%), 255/35R22 (-0.61%), 355/25R22 (-0.74%), 295/30R22 (-0.81%), 315/30R22 (+0.81%), 275/35R22 (+1.28%).
How many revolutions per mile does a 305/30R22 tire make?
About 691 revolutions per mile (circumference 91.7").
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.