315/40R19 tire size
315/40R19 is a metric size: 28.9" tall, 12.4" wide, on a 19" rim — about a 29x12.50R19. The sidewall is 5.0" and the tire turns 697 times per mile.
315/40R19 specs
| Overall diameter (height) | 28.92" · 735 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 4.96" · 126 mm (40% of width) |
| Rim diameter | 19" |
| Circumference | 90.86" · 2.308 m |
| Revolutions per mile | 697 (433 per km) |
| Inch (flotation) equivalent | 29x12.50R19 |
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 | |
|---|---|---|---|---|---|
| 235/55R19 common | 29.18" | +0.88% | -80 mm | 60.5 mph | calculate → |
| 245/45R19 common | 27.68" | -4.29% | -70 mm | 57.4 mph | calculate → |
| 255/50R19 common | 29.04" | +0.41% | -60 mm | 60.2 mph | calculate → |
| 255/45R19 common | 28.04" | -3.06% | -60 mm | 58.2 mph | calculate → |
| 225/55R19 common | 28.74" | -0.61% | -90 mm | 59.6 mph | calculate → |
| 275/40R19 common | 27.66" | -4.36% | -40 mm | 57.4 mph | calculate → |
| 235/50R19 common | 28.25" | -2.31% | -80 mm | 58.6 mph | calculate → |
| 245/55R19 common | 29.61" | +2.38% | -70 mm | 61.4 mph | calculate → |
| 255/55R19 common | 30.04" | +3.88% | -60 mm | 62.3 mph | calculate → |
| 265/50R19 common | 29.43" | +1.77% | -50 mm | 61.1 mph | calculate → |
| 245/50R19 common | 28.65" | -0.95% | -70 mm | 59.4 mph | calculate → |
| 285/40R19 | 27.98" | -3.27% | -30 mm | 58.0 mph | calculate → |
| 275/45R19 | 28.74" | -0.61% | -40 mm | 59.6 mph | calculate → |
| 285/45R19 | 29.10" | +0.61% | -30 mm | 60.4 mph | calculate → |
| 275/50R19 | 29.83" | +3.13% | -40 mm | 61.9 mph | calculate → |
| 295/40R19 | 28.29" | -2.18% | -20 mm | 58.7 mph | calculate → |
| 265/45R19 | 28.39" | -1.84% | -50 mm | 58.9 mph | calculate → |
| 235/60R19 | 30.10" | +4.08% | -80 mm | 62.5 mph | calculate → |
| 155/70R19 | 27.54" | -4.76% | -160 mm | 57.1 mph | calculate → |
| 295/45R19 | 29.45" | +1.84% | -20 mm | 61.1 mph | calculate → |
| 345/35R19 | 28.51" | -1.43% | +30 mm | 59.1 mph | calculate → |
| 155/80R19 | 28.76" | -0.54% | -160 mm | 59.7 mph | calculate → |
| 175/80R19 | 30.02" | +3.81% | -140 mm | 62.3 mph | calculate → |
| 315/35R19 | 27.68" | -4.29% | 0 mm | 57.4 mph | calculate → |
| 145/80R19 | 28.13" | -2.72% | -170 mm | 58.4 mph | calculate → |
| 225/50R19 | 27.86" | -3.68% | -90 mm | 57.8 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 | |
|---|---|---|---|---|---|
| 235/60R18 common | 29.10" | +0.63% | -80 mm | 60.4 mph | calculate → |
| 245/45R20 common | 28.68" | -0.83% | -70 mm | 59.5 mph | calculate → |
| 255/45R20 common | 29.04" | +0.39% | -60 mm | 60.2 mph | calculate → |
| 255/55R18 common | 29.04" | +0.42% | -60 mm | 60.3 mph | calculate → |
| 275/40R20 common | 28.66" | -0.90% | -40 mm | 59.5 mph | calculate → |
| 315/35R20 common | 28.68" | -0.83% | 0 mm | 59.5 mph | calculate → |
| 285/40R20 | 28.98" | +0.19% | -30 mm | 60.1 mph | calculate → |
| 155/90R18 | 28.98" | +0.22% | -160 mm | 60.1 mph | calculate → |
| 325/35R20 | 28.96" | +0.12% | +10 mm | 60.1 mph | calculate → |
| 305/45R18 | 28.81" | -0.39% | -10 mm | 59.8 mph | calculate → |
| 29x15.00R20 | 29.00" | +0.27% | +66 mm | 60.2 mph | calculate → |
| 29x18.00R20 | 29.00" | +0.27% | +142 mm | 60.2 mph | calculate → |
Try another size against 315/40R19
Questions
What size is 315/40R19 in inches?
315/40R19 is about 28.9" tall and 12.4" wide on a 19-inch rim — roughly a 29x12.50R19 in inch sizing.
What does 315/40R19 mean?
315 mm section width, sidewall 40% of the width (4.96"), radial construction, 19-inch rim.
What tire sizes are equivalent to 315/40R19?
On the same 19" rim, within 3% of the diameter: 255/50R19 (+0.41%), 155/80R19 (-0.54%), 225/55R19 (-0.61%), 275/45R19 (-0.61%), 285/45R19 (+0.61%), 235/55R19 (+0.88%).
How many revolutions per mile does a 315/40R19 tire make?
About 697 revolutions per mile (circumference 90.9").
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.