Tire Ruler225/45R19 dimensions
| Overall diameter (height) | 26.97″ · 685 mm |
| Section width | 8.86″ · 225 mm |
| Sidewall height | 3.99″ · 101 mm |
| Wheel diameter | 19″ |
| Rim width (rule of thumb) | 6–8″ |
| Circumference | 84.7″ |
| Revolutions per mile | 748 |
| In inches (flotation style) | 27.0 × 8.9R19 |
How it’s calculated: the sidewall is 45% of the 225 mm width = 101.3 mm (3.99″). Add two sidewalls to the 19″ wheel: 19 + 2 × 3.99 = 26.97″.
Bigger tires than 225/45R19 on 19″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 235/45R19 | 27.3″ | +0.35″ (+1.3%) | 60.8 mph |
| 245/45R19 | 27.7″ | +0.71″ (+2.6%) | 61.6 mph |
“60 mph reads” is your real speed when a speedometer set up for 225/45R19 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 225/45R19
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:
- 215/70R15: 26.9″ tall on a 15″ wheel (−0.5%)
- 215/65R16: 27.0″ tall on a 16″ wheel (+0.1%)
- 225/60R16: 26.6″ tall on a 16″ wheel (−1.3%)
- 215/60R17: 27.2″ tall on a 17″ wheel (+0.7%)
- 225/55R17: 26.7″ tall on a 17″ wheel (−0.8%)
- 235/55R17: 27.2″ tall on a 17″ wheel (+0.8%)
- 235/50R18: 27.3″ tall on an 18″ wheel (+1.0%)
- 245/45R18: 26.7″ tall on an 18″ wheel (−1.1%)
- 215/55R18: 27.3″ tall on an 18″ wheel (+1.3%)
Frequently asked questions
Is 225/45R19 a 27 inch tire?
Yes. 225/45R19 is 26.97 inches tall, so it's sold and talked about as a 27-inch tire.
What size is 225/45R19 in inches?
225/45R19 is 27.0 inches tall (overall diameter), 8.9 inches wide, with a 4.0 inch sidewall, and fits a 19 inch wheel.
What tire size is equivalent to 225/45R19?
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 225/45R19?
As a rule of thumb, about 6–8 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 225/45R19 make?
About 748 revolutions per mile in theory (circumference 84.7 in). Real tires turn slightly more because they flatten under load.