Tire Ruler245/55R19 dimensions
| Overall diameter (height) | 29.61″ · 752 mm |
| Section width | 9.65″ · 245 mm |
| Sidewall height | 5.31″ · 135 mm |
| Wheel diameter | 19″ |
| Rim width (rule of thumb) | 7–8.5″ |
| Circumference | 93.0″ |
| Revolutions per mile | 681 |
| In inches (flotation style) | 29.6 × 9.6R19 |
How it’s calculated: the sidewall is 55% of the 245 mm width = 134.8 mm (5.31″). Add two sidewalls to the 19″ wheel: 19 + 2 × 5.31 = 29.61″.
Bigger tires than 245/55R19 on 19″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 255/55R19 | 30.0″ | +0.43″ (+1.5%) | 60.9 mph |
| 255/60R19 | 31.0″ | +1.44″ (+4.9%) | 62.9 mph |
“60 mph reads” is your real speed when a speedometer set up for 245/55R19 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 245/55R19
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 |
|---|---|---|---|
| 235/55R19 | 29.2″ | 9.3″ | −1.5% |
| 255/55R19 | 30.0″ | 10.0″ | +1.5% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 30x9.50R15: 30.0″ tall on a 15″ wheel (+1.3%)
- 235/75R16: 29.9″ tall on a 16″ wheel (+0.9%)
- 225/75R16: 29.3″ tall on a 16″ wheel (−1.1%)
- 245/70R16: 29.5″ tall on a 16″ wheel (−0.4%)
- 245/65R17: 29.5″ tall on a 17″ wheel (−0.2%)
- 255/65R17: 30.1″ tall on a 17″ wheel (+1.5%)
- 235/70R17: 30.0″ tall on a 17″ wheel (+1.2%)
- 245/60R18: 29.6″ tall on an 18″ wheel (−0.1%)
- 235/65R18: 30.0″ tall on an 18″ wheel (+1.4%)
- 255/50R20: 30.0″ tall on a 20″ wheel (+1.4%)
- 245/50R20: 29.6″ tall on a 20″ wheel (+0.1%)
- 275/45R20: 29.7″ tall on a 20″ wheel (+0.5%)
- 265/45R20: 29.4″ tall on a 20″ wheel (−0.7%)
Frequently asked questions
Is 245/55R19 a 30 inch tire?
Not quite. 245/55R19 is 29.61 inches tall, between a 29 and a 30 inch tire.
What size is 245/55R19 in inches?
245/55R19 is 29.6 inches tall (overall diameter), 9.6 inches wide, with a 5.3 inch sidewall, and fits a 19 inch wheel.
What tire size is equivalent to 245/55R19?
Sizes within 1.5% of the same diameter on a 19" wheel: 235/55R19 (29.2"), 255/55R19 (30.0"). Check load index and width before swapping.
What rim width fits 245/55R19?
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 245/55R19 make?
About 681 revolutions per mile in theory (circumference 93.0 in). Real tires turn slightly more because they flatten under load.