Tire Ruler245/45R19 dimensions
| Overall diameter (height) | 27.68″ · 703 mm |
| Section width | 9.65″ · 245 mm |
| Sidewall height | 4.34″ · 110 mm |
| Wheel diameter | 19″ |
| Rim width (rule of thumb) | 7–8.5″ |
| Circumference | 87.0″ |
| Revolutions per mile | 729 |
| In inches (flotation style) | 27.7 × 9.6R19 |
How it’s calculated: the sidewall is 45% of the 245 mm width = 110.3 mm (4.34″). Add two sidewalls to the 19″ wheel: 19 + 2 × 4.34 = 27.68″.
Bigger tires than 245/45R19 on 19″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 255/50R19 | 29.0″ | +1.36″ (+4.9%) | 62.9 mph |
| 235/55R19 | 29.2″ | +1.50″ (+5.4%) | 63.2 mph |
| 245/55R19 | 29.6″ | +1.93″ (+7.0%) | 64.2 mph |
“60 mph reads” is your real speed when a speedometer set up for 245/45R19 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 245/45R19
Within 1.5% of the same height on a 19″ wheel. Usually interchangeable for the speedometer; check width, load index and clearance.
| Size | Height | Width | Difference |
|---|---|---|---|
| 235/45R19 | 27.3″ | 9.3″ | −1.3% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 225/70R15: 27.4″ tall on a 15″ wheel (−1.0%)
- 215/70R16: 27.9″ tall on a 16″ wheel (+0.6%)
- 225/60R17: 27.6″ tall on a 17″ wheel (−0.2%)
- 225/55R18: 27.7″ tall on an 18″ wheel (+0.2%)
- 215/55R18: 27.3″ tall on an 18″ wheel (−1.3%)
Frequently asked questions
Is 245/45R19 a 28 inch tire?
Not quite. 245/45R19 is 27.68 inches tall, between a 27 and a 28 inch tire.
What size is 245/45R19 in inches?
245/45R19 is 27.7 inches tall (overall diameter), 9.6 inches wide, with a 4.3 inch sidewall, and fits a 19 inch wheel.
What tire size is equivalent to 245/45R19?
Sizes within 1.5% of the same diameter on a 19" wheel: 235/45R19 (27.3"). Check load index and width before swapping.
What rim width fits 245/45R19?
As a rule of thumb, about 7–8.5 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 245/45R19 make?
About 729 revolutions per mile in theory (circumference 87.0 in). Real tires turn slightly more because they flatten under load.