255/30R24 tire size
255/30R24 is a metric size: 30.0" tall, 10.0" wide, on a 24" rim — about a 30x10.00R24. The sidewall is 3.0" and the tire turns 672 times per mile.
255/30R24 specs
| Overall diameter (height) | 30.02" · 763 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 3.01" · 77 mm (30% of width) |
| Rim diameter | 24" |
| Circumference | 94.32" · 2.396 m |
| Revolutions per mile | 672 (417 per km) |
| Inch (flotation) equivalent | 30x10.00R24 |
Equivalent sizes on a 24" 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 | |
|---|---|---|---|---|---|
| 275/25R24 | 29.41" | -2.03% | +20 mm | 58.8 mph | calculate → |
| 275/30R24 | 30.50" | +1.57% | +20 mm | 60.9 mph | calculate → |
| 285/30R24 | 30.73" | +2.36% | +30 mm | 61.4 mph | calculate → |
Try another size against 255/30R24
Questions
What size is 255/30R24 in inches?
255/30R24 is about 30.0" tall and 10.0" wide on a 24-inch rim — roughly a 30x10.00R24 in inch sizing.
What does 255/30R24 mean?
255 mm section width, sidewall 30% of the width (3.01"), radial construction, 24-inch rim.
What tire sizes are equivalent to 255/30R24?
On the same 24" rim, within 3% of the diameter: 275/30R24 (+1.57%), 275/25R24 (-2.03%), 285/30R24 (+2.36%).
How many revolutions per mile does a 255/30R24 tire make?
About 672 revolutions per mile (circumference 94.3").
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.