315/60R15 tire size
315/60R15 is a metric size: 29.9" tall, 12.4" wide, on a 15" rim — about a 30x12.50R15. The sidewall is 7.4" and the tire turns 675 times per mile.
315/60R15 specs
| Overall diameter (height) | 29.88" · 759 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 7.44" · 189 mm (60% of width) |
| Rim diameter | 15" |
| Circumference | 93.88" · 2.384 m |
| Revolutions per mile | 675 (419 per km) |
| Inch (flotation) equivalent | 30x12.50R15 |
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" | -3.36% | -80 mm | 58.0 mph | calculate → |
| 31x10.50R15 common | 31.00" | +3.74% | -48 mm | 62.2 mph | calculate → |
| 30x9.50R15 | 30.00" | +0.40% | -74 mm | 60.2 mph | calculate → |
| 255/70R15 | 29.06" | -2.77% | -60 mm | 58.3 mph | calculate → |
| 265/70R15 | 29.61" | -0.92% | -50 mm | 59.4 mph | calculate → |
| 265/75R15 | 30.65" | +2.57% | -50 mm | 61.5 mph | calculate → |
| 31x12.50R15 | 31.00" | +3.74% | +3 mm | 62.2 mph | calculate → |
| 295/65R15 | 30.10" | +0.72% | -20 mm | 60.4 mph | calculate → |
| 29x10.50R15 | 29.00" | -2.95% | -48 mm | 58.2 mph | calculate → |
| 30x11.50R15 | 30.00" | +0.40% | -23 mm | 60.2 mph | calculate → |
| 30x10.50R15 | 30.00" | +0.40% | -48 mm | 60.2 mph | calculate → |
| 30x10.00R15 | 30.00" | +0.40% | -61 mm | 60.2 mph | calculate → |
| 30x12.00R15 | 30.00" | +0.40% | -10 mm | 60.2 mph | calculate → |
| 30x9.00R15 | 30.00" | +0.40% | -86 mm | 60.2 mph | calculate → |
| 255/75R15 | 30.06" | +0.59% | -60 mm | 60.4 mph | calculate → |
| 29.5x10.50R15 | 29.50" | -1.28% | -48 mm | 59.2 mph | calculate → |
| 29.5x11.50R15 | 29.50" | -1.28% | -23 mm | 59.2 mph | calculate → |
| 29.5x13.50R15 | 29.50" | -1.28% | +28 mm | 59.2 mph | calculate → |
| 29.5x9.00R15 | 29.50" | -1.28% | -86 mm | 59.2 mph | calculate → |
| 215/85R15 | 29.39" | -1.65% | -100 mm | 59.0 mph | calculate → |
| 29x11.50R15 | 29.00" | -2.95% | -23 mm | 58.2 mph | calculate → |
| 29x15.00R15 | 29.00" | -2.95% | +66 mm | 58.2 mph | calculate → |
| 29x18.00R15 | 29.00" | -2.95% | +142 mm | 58.2 mph | calculate → |
| 29x8.50R15 | 29.00" | -2.95% | -99 mm | 58.2 mph | calculate → |
| 31x11.50R15 | 31.00" | +3.74% | -23 mm | 62.2 mph | calculate → |
| 31x11.00R15 | 31.00" | +3.74% | -36 mm | 62.2 mph | calculate → |
| 31x13.50R15 | 31.00" | +3.74% | +28 mm | 62.2 mph | calculate → |
| 31x13.00R15 | 31.00" | +3.74% | +15 mm | 62.2 mph | calculate → |
| 31x16.50R15 | 31.00" | +3.74% | +104 mm | 62.2 mph | calculate → |
| 31x16.00R15 | 31.00" | +3.74% | +91 mm | 62.2 mph | calculate → |
| 31x18.00R15 | 31.00" | +3.74% | +142 mm | 62.2 mph | calculate → |
| 31x9.50R15 | 31.00" | +3.74% | -74 mm | 62.2 mph | calculate → |
| 30x12.50R15 | 30.00" | +0.40% | +3 mm | 60.2 mph | calculate → |
| 30x13.50R15 | 30.00" | +0.40% | +28 mm | 60.2 mph | calculate → |
| 30x7.00R15 | 30.00" | +0.40% | -137 mm | 60.2 mph | calculate → |
| 29x12.50R15 | 29.00" | -2.95% | +3 mm | 58.2 mph | calculate → |
| 29x15.50R15 | 29.00" | -2.95% | +79 mm | 58.2 mph | calculate → |
| 29x18.50R15 | 29.00" | -2.95% | +155 mm | 58.2 mph | calculate → |
| 31x14.50R15 | 31.00" | +3.74% | +53 mm | 62.2 mph | calculate → |
| 31x18.50R15 | 31.00" | +3.74% | +155 mm | 62.2 mph | calculate → |
| 245/70R15 | 28.50" | -4.61% | -70 mm | 57.2 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" | +0.58% | -60 mm | 60.3 mph | calculate → |
| 235/75R16 | 29.88" | -0.01% | -80 mm | 60.0 mph | calculate → |
| 30x10.00R14 | 30.00" | +0.40% | -61 mm | 60.2 mph | calculate → |
| 30x11.50R16 | 30.00" | +0.40% | -23 mm | 60.2 mph | calculate → |
Try another size against 315/60R15
Questions
What size is 315/60R15 in inches?
315/60R15 is about 29.9" tall and 12.4" wide on a 15-inch rim — roughly a 30x12.50R15 in inch sizing.
What does 315/60R15 mean?
315 mm section width, sidewall 60% of the width (7.44"), radial construction, 15-inch rim.
What tire sizes are equivalent to 315/60R15?
On the same 15" rim, within 3% of the diameter: 30x10.50R15 (+0.40%), 30x10.00R15 (+0.40%), 30x11.50R15 (+0.40%), 30x12.50R15 (+0.40%), 30x12.00R15 (+0.40%), 30x13.50R15 (+0.40%).
How many revolutions per mile does a 315/60R15 tire make?
About 675 revolutions per mile (circumference 93.9").
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.