245/40R19 tire size
245/40R19 is a metric size: 26.7" tall, 9.6" wide, on a 19" rim — about a 26.5x9.50R19. The sidewall is 3.9" and the tire turns 755 times per mile.
245/40R19 specs
| Overall diameter (height) | 26.72" · 679 mm |
|---|---|
| Section width | 9.65" · 245 mm |
| Sidewall height | 3.86" · 98 mm (40% of width) |
| Rim diameter | 19" |
| Circumference | 83.93" · 2.132 m |
| Revolutions per mile | 755 (469 per km) |
| Inch (flotation) equivalent | 26.5x9.50R19 |
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 | |
|---|---|---|---|---|---|
| 245/45R19 common | 27.68" | +3.61% | 0 mm | 62.2 mph | compare → |
| 235/40R19 common | 26.40" | -1.18% | -10 mm | 59.3 mph | compare → |
| 255/40R19 common | 27.03" | +1.18% | +10 mm | 60.7 mph | compare → |
| 255/35R19 common | 26.03" | -2.58% | +10 mm | 58.5 mph | compare → |
| 255/45R19 common | 28.04" | +4.94% | +10 mm | 63.0 mph | compare → |
| 275/35R19 common | 26.58" | -0.52% | +30 mm | 59.7 mph | compare → |
| 275/40R19 common | 27.66" | +3.54% | +30 mm | 62.1 mph | compare → |
| 245/35R19 common | 25.75" | -3.61% | 0 mm | 57.8 mph | compare → |
| 225/40R19 common | 26.09" | -2.36% | -20 mm | 58.6 mph | compare → |
| 235/35R19 common | 25.48" | -4.64% | -10 mm | 57.2 mph | compare → |
| 225/45R19 common | 26.97" | +0.96% | -20 mm | 60.6 mph | compare → |
| 285/35R19 common | 26.85" | +0.52% | +40 mm | 60.3 mph | compare → |
| 265/35R19 common | 26.30" | -1.55% | +20 mm | 59.1 mph | compare → |
| 235/45R19 common | 27.33" | +2.28% | -10 mm | 61.4 mph | compare → |
| 285/30R19 | 25.73" | -3.68% | +40 mm | 57.8 mph | compare → |
| 305/30R19 | 26.20" | -1.92% | +60 mm | 58.9 mph | compare → |
| 295/30R19 | 25.97" | -2.80% | +50 mm | 58.3 mph | compare → |
| 285/40R19 | 27.98" | +4.72% | +40 mm | 62.8 mph | compare → |
| 325/30R19 | 26.68" | -0.15% | +80 mm | 59.9 mph | compare → |
| 265/40R19 | 27.35" | +2.36% | +20 mm | 61.4 mph | compare → |
| 275/30R19 | 25.50" | -4.57% | +30 mm | 57.3 mph | compare → |
| 295/35R19 | 27.13" | +1.55% | +50 mm | 60.9 mph | compare → |
| 345/30R19 | 27.15" | +1.62% | +100 mm | 61.0 mph | compare → |
| 315/30R19 | 26.44" | -1.03% | +70 mm | 59.4 mph | compare → |
| 305/35R19 | 27.41" | +2.58% | +60 mm | 61.5 mph | calculate → |
| 155/70R19 | 27.54" | +3.09% | -90 mm | 61.9 mph | calculate → |
| 355/30R19 | 27.39" | +2.51% | +110 mm | 61.5 mph | calculate → |
| 215/50R19 | 27.46" | +2.80% | -30 mm | 61.7 mph | calculate → |
| 195/50R19 | 26.68" | -0.15% | -50 mm | 59.9 mph | calculate → |
| 175/60R19 | 27.27" | +2.06% | -70 mm | 61.2 mph | calculate → |
| 335/30R19 | 26.91" | +0.74% | +90 mm | 60.4 mph | calculate → |
| 315/35R19 | 27.68" | +3.61% | +70 mm | 62.2 mph | calculate → |
| 225/50R19 | 27.86" | +4.27% | -20 mm | 62.6 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 | |
|---|---|---|---|---|---|
| 245/45R18 common | 26.68" | -0.13% | 0 mm | 59.9 mph | compare → |
| 225/50R18 common | 26.86" | +0.53% | -20 mm | 60.3 mph | compare → |
| 245/35R20 common | 26.75" | +0.13% | 0 mm | 60.1 mph | compare → |
| 275/40R18 common | 26.66" | -0.21% | +30 mm | 59.9 mph | compare → |
| 285/30R20 common | 26.73" | +0.06% | +40 mm | 60.0 mph | compare → |
| 275/30R20 common | 26.50" | -0.83% | +30 mm | 59.5 mph | compare → |
| 235/35R20 | 26.48" | -0.90% | -10 mm | 59.5 mph | compare → |
| 295/30R20 | 26.97" | +0.94% | +50 mm | 60.6 mph | compare → |
| 335/25R20 | 26.59" | -0.46% | +90 mm | 59.7 mph | compare → |
| 215/50R18 | 26.46" | -0.94% | -30 mm | 59.4 mph | compare → |
| 285/40R18 | 26.98" | +0.97% | +40 mm | 60.6 mph | calculate → |
| 345/25R20 | 26.79" | +0.28% | +100 mm | 60.2 mph | calculate → |
| 145/60R20 | 26.85" | +0.50% | -100 mm | 60.3 mph | calculate → |
| 155/70R18 | 26.54" | -0.65% | -90 mm | 59.6 mph | calculate → |
| 325/35R18 | 26.96" | +0.90% | +80 mm | 60.5 mph | calculate → |
| 315/35R18 | 26.68" | -0.13% | +70 mm | 59.9 mph | calculate → |
Try another size against 245/40R19
Questions
What size is 245/40R19 in inches?
245/40R19 is about 26.7" tall and 9.6" wide on a 19-inch rim — roughly a 26.5x9.50R19 in inch sizing.
What does 245/40R19 mean?
245 mm section width, sidewall 40% of the width (3.86"), radial construction, 19-inch rim.
What tire sizes are equivalent to 245/40R19?
On the same 19" rim, within 3% of the diameter: 195/50R19 (-0.15%), 325/30R19 (-0.15%), 275/35R19 (-0.52%), 285/35R19 (+0.52%), 335/30R19 (+0.74%), 225/45R19 (+0.96%).
How many revolutions per mile does a 245/40R19 tire make?
About 755 revolutions per mile (circumference 83.9").
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.