255/45R19 tire size
255/45R19 is a metric size: 28.0" tall, 10.0" wide, on a 19" rim — about a 28x10.00R19. The sidewall is 4.5" and the tire turns 719 times per mile.
255/45R19 specs
| Overall diameter (height) | 28.04" · 712 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 4.52" · 115 mm (45% of width) |
| Rim diameter | 19" |
| Circumference | 88.08" · 2.237 m |
| Revolutions per mile | 719 (447 per km) |
| Inch (flotation) equivalent | 28x10.00R19 |
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" | +4.07% | -20 mm | 62.4 mph | compare → |
| 245/45R19 common | 27.68" | -1.26% | -10 mm | 59.2 mph | compare → |
| 245/40R19 common | 26.72" | -4.70% | -10 mm | 57.2 mph | compare → |
| 255/50R19 common | 29.04" | +3.58% | 0 mm | 62.1 mph | compare → |
| 255/40R19 common | 27.03" | -3.58% | 0 mm | 57.9 mph | compare → |
| 225/55R19 common | 28.74" | +2.53% | -30 mm | 61.5 mph | compare → |
| 275/40R19 common | 27.66" | -1.33% | +20 mm | 59.2 mph | compare → |
| 225/45R19 common | 26.97" | -3.79% | -30 mm | 57.7 mph | compare → |
| 235/50R19 common | 28.25" | +0.77% | -20 mm | 60.5 mph | compare → |
| 285/35R19 common | 26.85" | -4.21% | +30 mm | 57.5 mph | compare → |
| 235/45R19 common | 27.33" | -2.53% | -20 mm | 58.5 mph | compare → |
| 265/50R19 common | 29.43" | +4.99% | +10 mm | 63.0 mph | compare → |
| 245/50R19 common | 28.65" | +2.18% | -10 mm | 61.3 mph | compare → |
| 285/40R19 | 27.98" | -0.21% | +30 mm | 59.9 mph | compare → |
| 265/40R19 | 27.35" | -2.46% | +10 mm | 58.5 mph | compare → |
| 325/30R19 | 26.68" | -4.84% | +70 mm | 57.1 mph | compare → |
| 275/45R19 | 28.74" | +2.53% | +20 mm | 61.5 mph | compare → |
| 295/35R19 | 27.13" | -3.23% | +40 mm | 58.1 mph | compare → |
| 285/45R19 | 29.10" | +3.79% | +30 mm | 62.3 mph | compare → |
| 345/30R19 | 27.15" | -3.16% | +90 mm | 58.1 mph | compare → |
| 295/40R19 | 28.29" | +0.91% | +40 mm | 60.5 mph | compare → |
| 265/45R19 | 28.39" | +1.26% | +10 mm | 60.8 mph | calculate → |
| 305/35R19 | 27.41" | -2.25% | +50 mm | 58.7 mph | calculate → |
| 155/70R19 | 27.54" | -1.76% | -100 mm | 58.9 mph | calculate → |
| 355/30R19 | 27.39" | -2.32% | +100 mm | 58.6 mph | calculate → |
| 345/35R19 | 28.51" | +1.69% | +90 mm | 61.0 mph | calculate → |
| 215/50R19 | 27.46" | -2.04% | -40 mm | 58.8 mph | calculate → |
| 175/60R19 | 27.27" | -2.74% | -80 mm | 58.4 mph | calculate → |
| 195/50R19 | 26.68" | -4.84% | -60 mm | 57.1 mph | calculate → |
| 315/35R19 | 27.68" | -1.26% | +60 mm | 59.2 mph | calculate → |
| 155/80R19 | 28.76" | +2.60% | -100 mm | 61.6 mph | calculate → |
| 315/40R19 | 28.92" | +3.16% | +60 mm | 61.9 mph | calculate → |
| 335/30R19 | 26.91" | -4.00% | +80 mm | 57.6 mph | calculate → |
| 145/80R19 | 28.13" | +0.35% | -110 mm | 60.2 mph | calculate → |
| 225/50R19 | 27.86" | -0.63% | -30 mm | 59.6 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 | |
|---|---|---|---|---|---|
| 235/55R18 common | 28.18" | +0.51% | -20 mm | 60.3 mph | compare → |
| 255/40R20 common | 28.03" | -0.01% | 0 mm | 60.0 mph | compare → |
| 285/35R20 common | 27.85" | -0.65% | +30 mm | 59.6 mph | compare → |
| 295/35R20 | 28.13" | +0.34% | +40 mm | 60.2 mph | compare → |
| 335/30R20 | 27.91" | -0.44% | +80 mm | 59.7 mph | calculate → |
| 345/30R20 | 28.15" | +0.41% | +90 mm | 60.2 mph | calculate → |
| 255/50R18 | 28.04" | +0.01% | 0 mm | 60.0 mph | calculate → |
| 315/40R18 | 27.92" | -0.41% | +60 mm | 59.8 mph | calculate → |
| 215/60R18 | 28.16" | +0.44% | -40 mm | 60.3 mph | calculate → |
| 28x12.00R18 | 28.00" | -0.13% | +50 mm | 59.9 mph | calculate → |
| 285/45R18 | 28.10" | +0.22% | +30 mm | 60.1 mph | calculate → |
| 28x10.00R18 | 28.00" | -0.13% | -1 mm | 59.9 mph | calculate → |
| 225/45R20 | 27.97" | -0.22% | -30 mm | 59.9 mph | calculate → |
| 155/65R20 | 27.93" | -0.37% | -100 mm | 59.8 mph | calculate → |
| 165/60R20 | 27.80" | -0.86% | -90 mm | 59.5 mph | calculate → |
Try another size against 255/45R19
Questions
What size is 255/45R19 in inches?
255/45R19 is about 28.0" tall and 10.0" wide on a 19-inch rim — roughly a 28x10.00R19 in inch sizing.
What does 255/45R19 mean?
255 mm section width, sidewall 45% of the width (4.52"), radial construction, 19-inch rim.
What tire sizes are equivalent to 255/45R19?
On the same 19" rim, within 3% of the diameter: 285/40R19 (-0.21%), 145/80R19 (+0.35%), 225/50R19 (-0.63%), 235/50R19 (+0.77%), 295/40R19 (+0.91%), 245/45R19 (-1.26%).
How many revolutions per mile does a 255/45R19 tire make?
About 719 revolutions per mile (circumference 88.1").
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.