255/75R15 tire size
255/75R15 is a metric size: 30.1" tall, 10.0" wide, on a 15" rim — about a 30x10.00R15. The sidewall is 7.5" and the tire turns 671 times per mile.
255/75R15 specs
| Overall diameter (height) | 30.06" · 764 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 7.53" · 191 mm (75% of width) |
| Rim diameter | 15" |
| Circumference | 94.43" · 2.399 m |
| Revolutions per mile | 671 (417 per km) |
| Inch (flotation) equivalent | 30x10.00R15 |
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" | -3.93% | -20 mm | 57.6 mph | calculate → |
| 31x10.50R15 common | 31.00" | +3.13% | +12 mm | 61.9 mph | calculate → |
| 30x9.50R15 | 30.00" | -0.20% | -14 mm | 59.9 mph | calculate → |
| 255/70R15 | 29.06" | -3.34% | 0 mm | 58.0 mph | calculate → |
| 265/70R15 | 29.61" | -1.51% | +10 mm | 59.1 mph | calculate → |
| 265/75R15 | 30.65" | +1.96% | +10 mm | 61.2 mph | calculate → |
| 31x12.50R15 | 31.00" | +3.13% | +63 mm | 61.9 mph | calculate → |
| 295/65R15 | 30.10" | +0.13% | +40 mm | 60.1 mph | calculate → |
| 29x10.50R15 | 29.00" | -3.52% | +12 mm | 57.9 mph | calculate → |
| 30x11.50R15 | 30.00" | -0.20% | +37 mm | 59.9 mph | calculate → |
| 30x10.50R15 | 30.00" | -0.20% | +12 mm | 59.9 mph | calculate → |
| 30x10.00R15 | 30.00" | -0.20% | -1 mm | 59.9 mph | calculate → |
| 30x12.00R15 | 30.00" | -0.20% | +50 mm | 59.9 mph | calculate → |
| 30x9.00R15 | 30.00" | -0.20% | -26 mm | 59.9 mph | calculate → |
| 29.5x10.50R15 | 29.50" | -1.86% | +12 mm | 58.9 mph | calculate → |
| 29.5x11.50R15 | 29.50" | -1.86% | +37 mm | 58.9 mph | calculate → |
| 29.5x13.50R15 | 29.50" | -1.86% | +88 mm | 58.9 mph | calculate → |
| 29.5x9.00R15 | 29.50" | -1.86% | -26 mm | 58.9 mph | calculate → |
| 215/85R15 | 29.39" | -2.23% | -40 mm | 58.7 mph | calculate → |
| 31x11.50R15 | 31.00" | +3.13% | +37 mm | 61.9 mph | calculate → |
| 31x11.00R15 | 31.00" | +3.13% | +24 mm | 61.9 mph | calculate → |
| 31x13.50R15 | 31.00" | +3.13% | +88 mm | 61.9 mph | calculate → |
| 31x13.00R15 | 31.00" | +3.13% | +75 mm | 61.9 mph | calculate → |
| 31x16.50R15 | 31.00" | +3.13% | +164 mm | 61.9 mph | calculate → |
| 31x16.00R15 | 31.00" | +3.13% | +151 mm | 61.9 mph | calculate → |
| 31x18.00R15 | 31.00" | +3.13% | +202 mm | 61.9 mph | calculate → |
| 31x9.50R15 | 31.00" | +3.13% | -14 mm | 61.9 mph | calculate → |
| 29x11.50R15 | 29.00" | -3.52% | +37 mm | 57.9 mph | calculate → |
| 29x15.00R15 | 29.00" | -3.52% | +126 mm | 57.9 mph | calculate → |
| 29x18.00R15 | 29.00" | -3.52% | +202 mm | 57.9 mph | calculate → |
| 29x8.50R15 | 29.00" | -3.52% | -39 mm | 57.9 mph | calculate → |
| 30x12.50R15 | 30.00" | -0.20% | +63 mm | 59.9 mph | calculate → |
| 30x13.50R15 | 30.00" | -0.20% | +88 mm | 59.9 mph | calculate → |
| 30x7.00R15 | 30.00" | -0.20% | -77 mm | 59.9 mph | calculate → |
| 315/60R15 | 29.88" | -0.59% | +60 mm | 59.6 mph | calculate → |
| 31x14.50R15 | 31.00" | +3.13% | +113 mm | 61.9 mph | calculate → |
| 31x18.50R15 | 31.00" | +3.13% | +215 mm | 61.9 mph | calculate → |
| 29x12.50R15 | 29.00" | -3.52% | +63 mm | 57.9 mph | calculate → |
| 29x15.50R15 | 29.00" | -3.52% | +139 mm | 57.9 mph | calculate → |
| 29x18.50R15 | 29.00" | -3.52% | +215 mm | 57.9 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" | -0.01% | 0 mm | 60.0 mph | calculate → |
| 235/75R16 | 29.88" | -0.60% | -20 mm | 59.6 mph | calculate → |
| 30x10.00R14 | 30.00" | -0.20% | -1 mm | 59.9 mph | calculate → |
| 30x11.50R16 | 30.00" | -0.20% | +37 mm | 59.9 mph | calculate → |
Try another size against 255/75R15
Questions
What size is 255/75R15 in inches?
255/75R15 is about 30.1" tall and 10.0" wide on a 15-inch rim — roughly a 30x10.00R15 in inch sizing.
What does 255/75R15 mean?
255 mm section width, sidewall 75% of the width (7.53"), radial construction, 15-inch rim.
What tire sizes are equivalent to 255/75R15?
On the same 15" rim, within 3% of the diameter: 295/65R15 (+0.13%), 30x10.50R15 (-0.20%), 30x10.00R15 (-0.20%), 30x11.50R15 (-0.20%), 30x12.50R15 (-0.20%), 30x12.00R15 (-0.20%).
How many revolutions per mile does a 255/75R15 tire make?
About 671 revolutions per mile (circumference 94.4").
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.