Tire Ruler225/75R15 dimensions
| Overall diameter (height) | 28.29″ · 718 mm |
| Section width | 8.86″ · 225 mm |
| Sidewall height | 6.64″ · 169 mm |
| Wheel diameter | 15″ |
| Rim width (rule of thumb) | 6–8″ |
| Circumference | 88.9″ |
| Revolutions per mile | 713 |
| In inches (flotation style) | 28.3 × 8.9R15 |
How it’s calculated: the sidewall is 75% of the 225 mm width = 168.8 mm (6.64″). Add two sidewalls to the 15″ wheel: 15 + 2 × 6.64 = 28.29″.
Bigger tires than 225/75R15 on 15″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 235/75R15 | 28.9″ | +0.59″ (+2.1%) | 61.3 mph |
| 30x9.50R15 | 30.0″ | +1.71″ (+6.1%) | 63.6 mph |
“60 mph reads” is your real speed when a speedometer set up for 225/75R15 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 225/70R16: 28.4″ tall on a 16″ wheel (+0.4%)
- 225/65R17: 28.5″ tall on a 17″ wheel (+0.8%)
- 235/60R17: 28.1″ tall on a 17″ wheel (−0.7%)
- 235/55R18: 28.2″ tall on an 18″ wheel (−0.4%)
- 225/60R18: 28.6″ tall on an 18″ wheel (+1.2%)
- 245/45R20: 28.7″ tall on a 20″ wheel (+1.4%)
- 275/40R20: 28.7″ tall on a 20″ wheel (+1.3%)
Popular 225/75R15 comparisons
Frequently asked questions
Is 225/75R15 a 28 inch tire?
Not quite. 225/75R15 is 28.29 inches tall, between a 28 and a 29 inch tire.
What size is 225/75R15 in inches?
225/75R15 is 28.3 inches tall (overall diameter), 8.9 inches wide, with a 6.6 inch sidewall, and fits a 15 inch wheel.
What tire size is equivalent to 225/75R15?
No common size on a 15" wheel is within 1.5% of 225/75R15's diameter. Use the calculator above to compare any size.
What rim width fits 225/75R15?
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 225/75R15 make?
About 713 revolutions per mile in theory (circumference 88.9 in). Real tires turn slightly more because they flatten under load.