30.4" tall, 12.0" wide, 4.2" sidewall
A 305/35R22 tire is 30.4 inches (772 mm) tall and 12.0 inches wide. The sidewall is 35% of the width, 4.2 inches, on a 22-inch wheel, and the tire turns about 663 times per mile.
In flotation terms that is about 30.4x12.0R22. People often call it a 30-inch tire.
The size most often compared with it is 305/40R22, which is 1.2" taller (+3.9%). At an indicated 60 mph you would be doing 62.4 mph on it, more than the 3% change many shops use as a limit.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 22" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 305/35R22 | |
|---|---|---|---|---|---|
| 295/35R22 | 30.1" | 11.6" | 4.1" | −0.9% | |
| 285/35R22 | 29.9" | 11.2" | 3.9" | −1.8% | |
| 325/35R22 | 31.0" | 12.8" | 4.5" | +1.8% | |
| 285/40R22 | 31.0" | 11.2" | 4.5" | +1.9% | |
| 295/40R22 | 31.3" | 11.6" | 4.6" | +2.9% | |
| 315/30R22 | 29.4" | 12.4" | 3.7" | −3.2% | |
| 305/30R22 | 29.2" | 12.0" | 3.6" | −3.9% | |
| 305/40R22 | 31.6" | 12.0" | 4.8" | +3.9% | compare |
| 295/30R22 | 29.0" | 11.6" | 3.5" | −4.7% | |
| 315/40R22 | 31.9" | 12.4" | 5.0" | +5.0% |
Sizes within 2% of 30.4" on 20" or 24" wheels.
| Size | Diameter | Width | Sidewall | vs 305/35R22 | |
|---|---|---|---|---|---|
| 295/45R20 | 30.5" | 11.6" | 5.2" | +0.2% | |
| 275/30R24 | 30.5" | 10.8" | 3.2" | +0.3% | |
| 245/55R20 | 30.6" | 9.6" | 5.3" | +0.7% | |
| 305/45R20 | 30.8" | 12.0" | 5.4" | +1.3% | |
| 275/50R20 | 30.8" | 10.8" | 5.4" | +1.4% | |
| 315/40R20 | 29.9" | 12.4" | 5.0" | −1.6% |
Actual speed when the speedometer is calibrated for 305/35R22.
| Speedometer shows | on 305/40R22 | on 295/35R22 | on 285/35R22 |
|---|---|---|---|
| 30 mph | 31.2 mph | 29.7 mph | 29.5 mph |
| 45 mph | 46.8 mph | 44.6 mph | 44.2 mph |
| 60 mph | 62.4 mph | 59.5 mph | 58.9 mph |
| 70 mph | 72.8 mph | 69.4 mph | 68.7 mph |
30.4 inches (772 mm). The sidewall is 4.2 inches.
12.0 inches (305 mm) section width, measured sidewall to sidewall.
About 30.4x12.0R22.
305/40R22 is +3.9% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.0" wider.