255/55R19 tire size
255/55R19 is a metric size: 30.0" tall, 10.0" wide, on a 19" rim — about a 30x10.00R19. The sidewall is 5.5" and the tire turns 671 times per mile.
255/55R19 specs
| Overall diameter (height) | 30.04" · 763 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 5.52" · 140 mm (55% of width) |
| Rim diameter | 19" |
| Circumference | 94.38" · 2.397 m |
| Revolutions per mile | 671 (417 per km) |
| Inch (flotation) equivalent | 30x10.00R19 |
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 | |
|---|---|---|---|---|---|
| 235/55R19 common | 29.18" | -2.88% | -20 mm | 58.3 mph | compare → |
| 255/50R19 common | 29.04" | -3.34% | 0 mm | 58.0 mph | compare → |
| 225/55R19 common | 28.74" | -4.32% | -30 mm | 57.4 mph | compare → |
| 245/55R19 common | 29.61" | -1.44% | -10 mm | 59.1 mph | compare → |
| 255/60R19 common | 31.05" | +3.34% | 0 mm | 62.0 mph | compare → |
| 265/50R19 common | 29.43" | -2.03% | +10 mm | 58.8 mph | compare → |
| 245/50R19 common | 28.65" | -4.65% | -10 mm | 57.2 mph | compare → |
| 275/55R19 | 30.91" | +2.88% | +20 mm | 61.7 mph | compare → |
| 275/45R19 | 28.74" | -4.32% | +20 mm | 57.4 mph | compare → |
| 285/45R19 | 29.10" | -3.15% | +30 mm | 58.1 mph | compare → |
| 275/50R19 | 29.83" | -0.72% | +20 mm | 59.6 mph | compare → |
| 265/55R19 | 30.48" | +1.44% | +10 mm | 60.9 mph | compare → |
| 235/60R19 | 30.10" | +0.20% | -20 mm | 60.1 mph | calculate → |
| 295/45R19 | 29.45" | -1.97% | +40 mm | 58.8 mph | calculate → |
| 235/65R19 | 31.03" | +3.28% | -20 mm | 62.0 mph | calculate → |
| 175/80R19 | 30.02" | -0.07% | -80 mm | 60.0 mph | calculate → |
| 165/90R19 | 30.69" | +2.16% | -90 mm | 61.3 mph | calculate → |
| 315/40R19 | 28.92" | -3.73% | +60 mm | 57.8 mph | calculate → |
| 155/80R19 | 28.76" | -4.26% | -100 mm | 57.4 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 | |
|---|---|---|---|---|---|
| 255/50R20 common | 30.04" | -0.01% | 0 mm | 60.0 mph | compare → |
| 235/65R18 common | 30.03" | -0.05% | -20 mm | 60.0 mph | compare → |
| 275/45R20 common | 29.74" | -1.00% | +20 mm | 59.4 mph | compare → |
| 235/55R20 common | 30.18" | +0.45% | -20 mm | 60.3 mph | compare → |
| 255/60R18 | 30.05" | +0.01% | 0 mm | 60.0 mph | compare → |
| 285/45R20 | 30.10" | +0.18% | +30 mm | 60.1 mph | compare → |
| 275/55R18 | 29.91" | -0.45% | +20 mm | 59.7 mph | calculate → |
| 285/55R18 | 30.34" | +1.00% | +30 mm | 60.6 mph | calculate → |
Try another size against 255/55R19
Questions
What size is 255/55R19 in inches?
255/55R19 is about 30.0" tall and 10.0" wide on a 19-inch rim — roughly a 30x10.00R19 in inch sizing.
What does 255/55R19 mean?
255 mm section width, sidewall 55% of the width (5.52"), radial construction, 19-inch rim.
What tire sizes are equivalent to 255/55R19?
On the same 19" rim, within 3% of the diameter: 175/80R19 (-0.07%), 235/60R19 (+0.20%), 275/50R19 (-0.72%), 265/55R19 (+1.44%), 245/55R19 (-1.44%), 295/45R19 (-1.97%).
How many revolutions per mile does a 255/55R19 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.