Tire Ruler305/45R22 dimensions
| Overall diameter (height) | 32.81″ · 833 mm |
| Section width | 12.01″ · 305 mm |
| Sidewall height | 5.40″ · 137 mm |
| Wheel diameter | 22″ |
| Rim width (rule of thumb) | 8.5–10.5″ |
| Circumference | 103.1″ |
| Revolutions per mile | 615 |
| In inches (flotation style) | 32.8 × 12.0R22 |
How it’s calculated: the sidewall is 45% of the 305 mm width = 137.3 mm (5.40″). Add two sidewalls to the 22″ wheel: 22 + 2 × 5.40 = 32.81″.
Bigger tires than 305/45R22 on 22″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 35x12.50R22 | 35.0″ | +2.19″ (+6.7%) | 64.0 mph |
“60 mph reads” is your real speed when a speedometer set up for 305/45R22 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 305/45R22
Within 1.5% of the same height on a 22″ wheel. Usually interchangeable for the speedometer; check width, load index and clearance.
| Size | Height | Width | Difference |
|---|---|---|---|
| 275/50R22 | 32.8″ | 10.8″ | +0.1% |
| 33x12.50R22 | 33.0″ | 12.5″ | +0.6% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 33x12.50R15: 33.0″ tall on a 15″ wheel (+0.6%)
- 285/75R16: 32.8″ tall on a 16″ wheel (+0.1%)
- 285/70R17: 32.7″ tall on a 17″ wheel (−0.3%)
- 295/70R17: 33.3″ tall on a 17″ wheel (+1.4%)
- 255/80R17: 33.1″ tall on a 17″ wheel (+0.8%)
- 33x12.50R17: 33.0″ tall on a 17″ wheel (+0.6%)
- 275/70R18: 33.2″ tall on an 18″ wheel (+1.1%)
- 285/65R18: 32.6″ tall on an 18″ wheel (−0.7%)
- 265/70R18: 32.6″ tall on an 18″ wheel (−0.6%)
- 33x12.50R18: 33.0″ tall on an 18″ wheel (+0.6%)
- 275/60R20: 33.0″ tall on a 20″ wheel (+0.6%)
- 285/55R20: 32.3″ tall on a 20″ wheel (−1.4%)
- 305/55R20: 33.2″ tall on a 20″ wheel (+1.2%)
- 295/55R20: 32.8″ tall on a 20″ wheel (−0.1%)
- 265/60R20: 32.5″ tall on a 20″ wheel (−0.9%)
- 33x12.50R20: 33.0″ tall on a 20″ wheel (+0.6%)
Frequently asked questions
Is 305/45R22 a 33 inch tire?
Yes. 305/45R22 is 32.81 inches tall, so it's sold and talked about as a 33-inch tire.
What size is 305/45R22 in inches?
305/45R22 is 32.8 inches tall (overall diameter), 12.0 inches wide, with a 5.4 inch sidewall, and fits a 22 inch wheel.
What tire size is equivalent to 305/45R22?
Sizes within 1.5% of the same diameter on a 22" wheel: 275/50R22 (32.8"), 33x12.50R22 (33.0"). Check load index and width before swapping.
What rim width fits 305/45R22?
As a rule of thumb, about 8.5–10.5 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 305/45R22 make?
About 615 revolutions per mile in theory (circumference 103.1 in). Real tires turn slightly more because they flatten under load.