255/70R15 tire size
255/70R15 is a metric size: 29.1" tall, 10.0" wide, on a 15" rim — about a 29x10.00R15. The sidewall is 7.0" and the tire turns 694 times per mile.
255/70R15 specs
| Overall diameter (height) | 29.06" · 738 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 7.03" · 179 mm (70% of width) |
| Rim diameter | 15" |
| Circumference | 91.28" · 2.318 m |
| Revolutions per mile | 694 (431 per km) |
| Inch (flotation) equivalent | 29x10.00R15 |
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" | -0.61% | -20 mm | 59.6 mph | calculate → |
| 215/75R15 | 27.70" | -4.67% | -40 mm | 57.2 mph | calculate → |
| 30x9.50R15 | 30.00" | +3.25% | -14 mm | 62.0 mph | calculate → |
| 225/75R15 | 28.29" | -2.64% | -30 mm | 58.4 mph | calculate → |
| 235/70R15 | 27.95" | -3.79% | -20 mm | 57.7 mph | calculate → |
| 265/70R15 | 29.61" | +1.90% | +10 mm | 61.1 mph | calculate → |
| 275/60R15 | 27.99" | -3.66% | +20 mm | 57.8 mph | calculate → |
| 29x10.50R15 | 29.00" | -0.19% | +12 mm | 59.9 mph | calculate → |
| 295/65R15 | 30.10" | +3.59% | +40 mm | 62.2 mph | calculate → |
| 325/50R15 | 27.80" | -4.34% | +70 mm | 57.4 mph | calculate → |
| 30x11.50R15 | 30.00" | +3.25% | +37 mm | 62.0 mph | calculate → |
| 28x10.50R15 | 28.00" | -3.63% | +12 mm | 57.8 mph | calculate → |
| 28x11.50R15 | 28.00" | -3.63% | +37 mm | 57.8 mph | calculate → |
| 28x9.00R15 | 28.00" | -3.63% | -26 mm | 57.8 mph | calculate → |
| 295/55R15 | 27.78" | -4.40% | +40 mm | 57.4 mph | calculate → |
| 29x11.50R15 | 29.00" | -0.19% | +37 mm | 59.9 mph | calculate → |
| 29x15.00R15 | 29.00" | -0.19% | +126 mm | 59.9 mph | calculate → |
| 29x18.00R15 | 29.00" | -0.19% | +202 mm | 59.9 mph | calculate → |
| 29x8.50R15 | 29.00" | -0.19% | -39 mm | 59.9 mph | calculate → |
| 215/85R15 | 29.39" | +1.15% | -40 mm | 60.7 mph | calculate → |
| 29.5x10.50R15 | 29.50" | +1.53% | +12 mm | 60.9 mph | calculate → |
| 29.5x11.50R15 | 29.50" | +1.53% | +37 mm | 60.9 mph | calculate → |
| 29.5x13.50R15 | 29.50" | +1.53% | +88 mm | 60.9 mph | calculate → |
| 29.5x9.00R15 | 29.50" | +1.53% | -26 mm | 60.9 mph | calculate → |
| 30x10.50R15 | 30.00" | +3.25% | +12 mm | 62.0 mph | calculate → |
| 30x10.00R15 | 30.00" | +3.25% | -1 mm | 62.0 mph | calculate → |
| 30x12.00R15 | 30.00" | +3.25% | +50 mm | 62.0 mph | calculate → |
| 30x9.00R15 | 30.00" | +3.25% | -26 mm | 62.0 mph | calculate → |
| 255/75R15 | 30.06" | +3.46% | 0 mm | 62.1 mph | calculate → |
| 28x10.00R15 | 28.00" | -3.63% | -1 mm | 57.8 mph | calculate → |
| 28x12.00R15 | 28.00" | -3.63% | +50 mm | 57.8 mph | calculate → |
| 28x6.00R15 | 28.00" | -3.63% | -103 mm | 57.8 mph | calculate → |
| 28x7.50R15 | 28.00" | -3.63% | -64 mm | 57.8 mph | calculate → |
| 29x12.50R15 | 29.00" | -0.19% | +63 mm | 59.9 mph | calculate → |
| 29x15.50R15 | 29.00" | -0.19% | +139 mm | 59.9 mph | calculate → |
| 29x18.50R15 | 29.00" | -0.19% | +215 mm | 59.9 mph | calculate → |
| 245/70R15 | 28.50" | -1.90% | -10 mm | 58.9 mph | calculate → |
| 315/60R15 | 29.88" | +2.85% | +60 mm | 61.7 mph | calculate → |
| 30x12.50R15 | 30.00" | +3.25% | +63 mm | 62.0 mph | calculate → |
| 30x13.50R15 | 30.00" | +3.25% | +88 mm | 62.0 mph | calculate → |
| 30x7.00R15 | 30.00" | +3.25% | -77 mm | 62.0 mph | calculate → |
| 255/65R15 | 28.05" | -3.46% | 0 mm | 57.9 mph | calculate → |
| 28x12.50R15 | 28.00" | -3.63% | +63 mm | 57.8 mph | calculate → |
| 28x13.50R15 | 28.00" | -3.63% | +88 mm | 57.8 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 | |
|---|---|---|---|---|---|
| 225/75R16 common | 29.29" | +0.80% | -30 mm | 60.5 mph | calculate → |
| 235/70R16 common | 28.95" | -0.35% | -20 mm | 59.8 mph | calculate → |
| 255/65R16 | 29.05" | -0.01% | 0 mm | 60.0 mph | calculate → |
| 29x9.00R14 | 29.00" | -0.19% | -26 mm | 59.9 mph | calculate → |
| 225/85R14 | 29.06" | +0.01% | -30 mm | 60.0 mph | calculate → |
| 29x11.00R14 | 29.00" | -0.19% | +24 mm | 59.9 mph | calculate → |
| 205/80R16 | 28.91" | -0.49% | -50 mm | 59.7 mph | calculate → |
| 275/60R16 | 28.99" | -0.22% | +20 mm | 59.9 mph | calculate → |
Try another size against 255/70R15
Questions
What size is 255/70R15 in inches?
255/70R15 is about 29.1" tall and 10.0" wide on a 15-inch rim — roughly a 29x10.00R15 in inch sizing.
What does 255/70R15 mean?
255 mm section width, sidewall 70% of the width (7.03"), radial construction, 15-inch rim.
What tire sizes are equivalent to 255/70R15?
On the same 15" rim, within 3% of the diameter: 29x10.50R15 (-0.19%), 29x11.50R15 (-0.19%), 29x12.50R15 (-0.19%), 29x15.50R15 (-0.19%), 29x15.00R15 (-0.19%), 29x18.50R15 (-0.19%).
How many revolutions per mile does a 255/70R15 tire make?
About 694 revolutions per mile (circumference 91.3").
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.