29.4" tall, 12.4" wide, 3.7" sidewall
A 315/30R22 tire is 29.4 inches (748 mm) tall and 12.4 inches wide. The sidewall is 30% of the width, 3.7 inches, on a 22-inch wheel, and the tire turns about 685 times per mile.
In flotation terms that is about 29.4x12.4R22. People often call it a 29-inch tire.
The size most often compared with it is 305/30R22, which is 0.2" shorter (−0.8%). At an indicated 60 mph you would be doing 59.5 mph on it.
| 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 315/30R22 | |
|---|---|---|---|---|---|
| 305/30R22 | 29.2" | 12.0" | 3.6" | −0.8% | |
| 295/30R22 | 29.0" | 11.6" | 3.5" | −1.6% | |
| 295/35R22 | 30.1" | 11.6" | 4.1" | +2.3% | |
| 305/35R22 | 30.4" | 12.0" | 4.2" | +3.3% | |
| 325/35R22 | 31.0" | 12.8" | 4.5" | +5.1% | |
| 295/40R22 | 31.3" | 11.6" | 4.6" | +6.3% | |
| 305/40R22 | 31.6" | 12.0" | 4.8" | +7.4% | |
| 315/40R22 | 31.9" | 12.4" | 5.0" | +8.4% | |
| 325/40R22 | 32.2" | 12.8" | 5.1" | +9.5% |
Sizes within 2% of 29.4" on 20" or 24" wheels.
| Size | Diameter | Width | Sidewall | vs 315/30R22 | |
|---|---|---|---|---|---|
| 295/40R20 | 29.3" | 11.6" | 4.6" | −0.5% | |
| 305/40R20 | 29.6" | 12.0" | 4.8" | +0.6% | |
| 245/30R24 | 29.8" | 9.6" | 2.9" | +1.2% | |
| 315/40R20 | 29.9" | 12.4" | 5.0" | +1.6% | |
| 325/35R20 | 29.0" | 12.8" | 4.5" | −1.6% |
Actual speed when the speedometer is calibrated for 315/30R22.
| Speedometer shows | on 305/30R22 | on 295/30R22 | on 295/35R22 |
|---|---|---|---|
| 30 mph | 29.8 mph | 29.5 mph | 30.7 mph |
| 45 mph | 44.6 mph | 44.3 mph | 46.1 mph |
| 60 mph | 59.5 mph | 59.0 mph | 61.4 mph |
| 70 mph | 69.4 mph | 68.9 mph | 71.6 mph |
29.4 inches (748 mm). The sidewall is 3.7 inches.
12.4 inches (315 mm) section width, measured sidewall to sidewall.
About 29.4x12.4R22.
305/30R22 is −0.8% in diameter, within the common 3% guideline. It is 0.4" narrower.