30x12.00R15 tire size
30x12.00R15 is a flotation (inch) size: 30.0" tall, 12.0" wide, on a 15" rim — about a 310/60R15. The sidewall is 7.5" and the tire turns 672 times per mile.
30x12.00R15 specs
| Overall diameter (height) | 30.00" · 762 mm |
|---|---|
| Section width | 12.00" · 305 mm |
| Sidewall height | 7.50" · 191 mm (63% of width) |
| Rim diameter | 15" |
| Circumference | 94.25" · 2.394 m |
| Revolutions per mile | 672 (418 per km) |
| Closest metric size | 310/60R15 |
Equivalent sizes on a 15" 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 | |
|---|---|---|---|---|---|
| 235/75R15 common | 28.88" | -3.74% | -70 mm | 57.8 mph | calculate → |
| 31x10.50R15 common | 31.00" | +3.33% | -38 mm | 62.0 mph | calculate → |
| 30x9.50R15 | 30.00" | 0.00% | -64 mm | 60.0 mph | calculate → |
| 255/70R15 | 29.06" | -3.15% | -50 mm | 58.1 mph | calculate → |
| 265/70R15 | 29.61" | -1.31% | -40 mm | 59.2 mph | calculate → |
| 265/75R15 | 30.65" | +2.17% | -40 mm | 61.3 mph | calculate → |
| 31x12.50R15 | 31.00" | +3.33% | +13 mm | 62.0 mph | calculate → |
| 295/65R15 | 30.10" | +0.33% | -10 mm | 60.2 mph | calculate → |
| 29x10.50R15 | 29.00" | -3.33% | -38 mm | 58.0 mph | calculate → |
| 30x11.50R15 | 30.00" | 0.00% | -13 mm | 60.0 mph | calculate → |
| 30x10.50R15 | 30.00" | 0.00% | -38 mm | 60.0 mph | calculate → |
| 30x10.00R15 | 30.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
| 30x9.00R15 | 30.00" | 0.00% | -76 mm | 60.0 mph | calculate → |
| 255/75R15 | 30.06" | +0.20% | -50 mm | 60.1 mph | calculate → |
| 29.5x10.50R15 | 29.50" | -1.67% | -38 mm | 59.0 mph | calculate → |
| 29.5x11.50R15 | 29.50" | -1.67% | -13 mm | 59.0 mph | calculate → |
| 29.5x13.50R15 | 29.50" | -1.67% | +38 mm | 59.0 mph | calculate → |
| 29.5x9.00R15 | 29.50" | -1.67% | -76 mm | 59.0 mph | calculate → |
| 215/85R15 | 29.39" | -2.03% | -90 mm | 58.8 mph | calculate → |
| 29x11.50R15 | 29.00" | -3.33% | -13 mm | 58.0 mph | calculate → |
| 29x15.00R15 | 29.00" | -3.33% | +76 mm | 58.0 mph | calculate → |
| 29x18.00R15 | 29.00" | -3.33% | +152 mm | 58.0 mph | calculate → |
| 29x8.50R15 | 29.00" | -3.33% | -89 mm | 58.0 mph | calculate → |
| 31x11.50R15 | 31.00" | +3.33% | -13 mm | 62.0 mph | calculate → |
| 31x11.00R15 | 31.00" | +3.33% | -26 mm | 62.0 mph | calculate → |
| 31x13.50R15 | 31.00" | +3.33% | +38 mm | 62.0 mph | calculate → |
| 31x13.00R15 | 31.00" | +3.33% | +25 mm | 62.0 mph | calculate → |
| 31x16.50R15 | 31.00" | +3.33% | +114 mm | 62.0 mph | calculate → |
| 31x16.00R15 | 31.00" | +3.33% | +101 mm | 62.0 mph | calculate → |
| 31x18.00R15 | 31.00" | +3.33% | +152 mm | 62.0 mph | calculate → |
| 31x9.50R15 | 31.00" | +3.33% | -64 mm | 62.0 mph | calculate → |
| 30x12.50R15 | 30.00" | 0.00% | +13 mm | 60.0 mph | calculate → |
| 30x13.50R15 | 30.00" | 0.00% | +38 mm | 60.0 mph | calculate → |
| 30x7.00R15 | 30.00" | 0.00% | -127 mm | 60.0 mph | calculate → |
| 315/60R15 | 29.88" | -0.39% | +10 mm | 59.8 mph | calculate → |
| 29x12.50R15 | 29.00" | -3.33% | +13 mm | 58.0 mph | calculate → |
| 29x15.50R15 | 29.00" | -3.33% | +89 mm | 58.0 mph | calculate → |
| 29x18.50R15 | 29.00" | -3.33% | +165 mm | 58.0 mph | calculate → |
| 31x14.50R15 | 31.00" | +3.33% | +63 mm | 62.0 mph | calculate → |
| 31x18.50R15 | 31.00" | +3.33% | +165 mm | 62.0 mph | calculate → |
| 245/70R15 | 28.50" | -4.99% | -60 mm | 57.0 mph | calculate → |
Plus / minus sizing: 14" and 16" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 255/70R16 common | 30.06" | +0.18% | -50 mm | 60.1 mph | calculate → |
| 235/75R16 | 29.88" | -0.41% | -70 mm | 59.8 mph | calculate → |
| 30x10.00R14 | 30.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
| 30x11.50R16 | 30.00" | 0.00% | -13 mm | 60.0 mph | calculate → |
Try another size against 30x12.00R15
Questions
What size is 30x12.00R15 in inches?
30x12.00R15 is about 30.0" tall and 12.0" wide on a 15-inch rim — roughly a 310/60R15 in inch sizing.
What does 30x12.00R15 mean?
30" overall diameter, 12.00" section width, radial, 15" rim.
What tire sizes are equivalent to 30x12.00R15?
On the same 15" rim, within 3% of the diameter: 30x10.50R15 (0.00%), 30x10.00R15 (0.00%), 30x11.50R15 (0.00%), 30x12.50R15 (0.00%), 30x13.50R15 (0.00%), 30x7.00R15 (0.00%).
How many revolutions per mile does a 30x12.00R15 tire make?
About 672 revolutions per mile (circumference 94.2").
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.