255/30R19 tire size
255/30R19 is a metric size: 25.0" tall, 10.0" wide, on a 19" rim — about a 25x10.00R19. The sidewall is 3.0" and the tire turns 806 times per mile.
255/30R19 specs
| Overall diameter (height) | 25.02" · 636 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 3.01" · 77 mm (30% of width) |
| Rim diameter | 19" |
| Circumference | 78.61" · 1.997 m |
| Revolutions per mile | 806 (501 per km) |
| Inch (flotation) equivalent | 25x10.00R19 |
Equivalent sizes on a 19" 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 | |
|---|---|---|---|---|---|
| 255/35R19 common | 26.03" | +4.01% | 0 mm | 62.4 mph | compare → |
| 245/35R19 common | 25.75" | +2.91% | -10 mm | 61.7 mph | compare → |
| 225/40R19 common | 26.09" | +4.25% | -30 mm | 62.5 mph | compare → |
| 235/35R19 common | 25.48" | +1.81% | -20 mm | 61.1 mph | compare → |
| 285/30R19 | 25.73" | +2.83% | +30 mm | 61.7 mph | compare → |
| 225/35R19 | 25.20" | +0.71% | -30 mm | 60.4 mph | compare → |
| 305/30R19 | 26.20" | +4.72% | +50 mm | 62.8 mph | compare → |
| 295/30R19 | 25.97" | +3.78% | +40 mm | 62.3 mph | compare → |
| 275/30R19 | 25.50" | +1.89% | +20 mm | 61.1 mph | compare → |
| 265/30R19 | 25.26" | +0.94% | +10 mm | 60.6 mph | compare → |
| 245/30R19 | 24.79" | -0.94% | -10 mm | 59.4 mph | calculate → |
| 315/25R19 | 25.20" | +0.71% | +60 mm | 60.4 mph | calculate → |
| 295/25R19 | 24.81" | -0.87% | +40 mm | 59.5 mph | calculate → |
| 215/35R19 | 24.93" | -0.39% | -40 mm | 59.8 mph | calculate → |
| 235/30R19 | 24.55" | -1.89% | -20 mm | 58.9 mph | calculate → |
Plus / minus sizing: 18" and 20" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 225/40R18 common | 25.09" | +0.25% | -30 mm | 60.2 mph | compare → |
| 255/35R18 common | 25.03" | +0.02% | 0 mm | 60.0 mph | compare → |
| 295/30R18 | 24.97" | -0.22% | +40 mm | 59.9 mph | compare → |
| 305/30R18 | 25.20" | +0.72% | +50 mm | 60.4 mph | calculate → |
| 215/30R20 | 25.08" | +0.22% | -40 mm | 60.1 mph | calculate → |
| 205/45R18 | 25.26" | +0.96% | -50 mm | 60.6 mph | calculate → |
Try another size against 255/30R19
Questions
What size is 255/30R19 in inches?
255/30R19 is about 25.0" tall and 10.0" wide on a 19-inch rim — roughly a 25x10.00R19 in inch sizing.
What does 255/30R19 mean?
255 mm section width, sidewall 30% of the width (3.01"), radial construction, 19-inch rim.
What tire sizes are equivalent to 255/30R19?
On the same 19" rim, within 3% of the diameter: 215/35R19 (-0.39%), 225/35R19 (+0.71%), 315/25R19 (+0.71%), 295/25R19 (-0.87%), 265/30R19 (+0.94%), 245/30R19 (-0.94%).
How many revolutions per mile does a 255/30R19 tire make?
About 806 revolutions per mile (circumference 78.6").
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.