315/30R22 tire size
315/30R22 is a metric size: 29.4" tall, 12.4" wide, on a 22" rim — about a 29.5x12.50R22. The sidewall is 3.7" and the tire turns 685 times per mile.
315/30R22 specs
| Overall diameter (height) | 29.44" · 748 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 3.72" · 95 mm (30% of width) |
| Rim diameter | 22" |
| Circumference | 92.49" · 2.349 m |
| Revolutions per mile | 685 (426 per km) |
| Inch (flotation) equivalent | 29.5x12.50R22 |
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" | +4.15% | -40 mm | 62.5 mph | compare → |
| 265/40R22 | 30.35" | +3.08% | -50 mm | 61.8 mph | compare → |
| 265/35R22 | 29.30" | -0.47% | -50 mm | 59.7 mph | compare → |
| 285/35R22 | 29.85" | +1.40% | -30 mm | 60.8 mph | compare → |
| 275/35R22 | 29.58" | +0.47% | -40 mm | 60.3 mph | compare → |
| 295/35R22 | 30.13" | +2.34% | -20 mm | 61.4 mph | compare → |
| 315/35R22 | 30.68" | +4.21% | 0 mm | 62.5 mph | compare → |
| 285/30R22 | 28.73" | -2.41% | -30 mm | 58.6 mph | compare → |
| 295/30R22 | 28.97" | -1.60% | -20 mm | 59.0 mph | compare → |
| 255/40R22 | 30.03" | +2.01% | -60 mm | 61.2 mph | compare → |
| 265/30R22 | 28.26" | -4.01% | -50 mm | 57.6 mph | compare → |
| 255/30R22 | 28.02" | -4.81% | -60 mm | 57.1 mph | compare → |
| 255/35R22 | 29.03" | -1.40% | -60 mm | 59.2 mph | calculate → |
| 335/25R22 | 28.59" | -2.88% | +20 mm | 58.3 mph | calculate → |
| 305/35R22 | 30.41" | +3.28% | -10 mm | 62.0 mph | calculate → |
| 315/25R22 | 28.20" | -4.21% | 0 mm | 57.5 mph | calculate → |
| 305/30R22 | 29.20" | -0.80% | -10 mm | 59.5 mph | calculate → |
| 325/30R22 | 29.68" | +0.80% | +10 mm | 60.5 mph | calculate → |
| 355/25R22 | 28.99" | -1.54% | +40 mm | 59.1 mph | calculate → |
| 275/30R22 | 28.50" | -3.21% | -40 mm | 58.1 mph | calculate → |
| 305/25R22 | 28.00" | -4.88% | -10 mm | 57.1 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" | -0.32% | -50 mm | 59.8 mph | compare → |
| 275/40R21 | 29.66" | +0.75% | -40 mm | 60.4 mph | compare → |
| 315/35R21 | 29.68" | +0.82% | 0 mm | 60.5 mph | compare → |
| 245/45R21 | 29.68" | +0.82% | -70 mm | 60.5 mph | compare → |
| 235/45R21 | 29.33" | -0.39% | -80 mm | 59.8 mph | calculate → |
| 305/35R21 | 29.41" | -0.12% | -10 mm | 59.9 mph | calculate → |
| 345/30R21 | 29.15" | -0.99% | +30 mm | 59.4 mph | calculate → |
| 315/25R23 | 29.20" | -0.82% | 0 mm | 59.5 mph | calculate → |
Try another size against 315/30R22
Questions
What size is 315/30R22 in inches?
315/30R22 is about 29.4" tall and 12.4" wide on a 22-inch rim — roughly a 29.5x12.50R22 in inch sizing.
What does 315/30R22 mean?
315 mm section width, sidewall 30% of the width (3.72"), radial construction, 22-inch rim.
What tire sizes are equivalent to 315/30R22?
On the same 22" rim, within 3% of the diameter: 265/35R22 (-0.47%), 275/35R22 (+0.47%), 305/30R22 (-0.80%), 325/30R22 (+0.80%), 255/35R22 (-1.40%), 285/35R22 (+1.40%).
How many revolutions per mile does a 315/30R22 tire make?
About 685 revolutions per mile (circumference 92.5").
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.