Tire Ruler30x9.50R15 dimensions
| Overall diameter (height) | 30.00″ · 762 mm |
| Section width | 9.50″ · 241 mm |
| Sidewall height | 7.50″ · 191 mm |
| Wheel diameter | 15″ |
| Rim width (rule of thumb) | 6.5–8.5″ |
| Circumference | 94.2″ |
| Revolutions per mile | 672 |
30x9.50R15 is a flotation size: the first number is the height (30″), the second the width (9.5″) and the last the wheel (15″). The sidewall is (30 − 15) ÷ 2 = 7.50″. In metric terms it’s close to a 240/80R15.
Bigger tires than 30x9.50R15 on 15″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 31x10.50R15 | 31.0″ | +1.00″ (+3.3%) | 62.0 mph |
| 32x11.50R15 | 32.0″ | +2.00″ (+6.7%) | 64.0 mph |
“60 mph reads” is your real speed when a speedometer set up for 30x9.50R15 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:
- 235/75R16: 29.9″ tall on a 16″ wheel (−0.4%)
- 255/70R16: 30.1″ tall on a 16″ wheel (+0.2%)
- 215/85R16: 30.4″ tall on a 16″ wheel (+1.3%)
- 255/65R17: 30.1″ tall on a 17″ wheel (+0.2%)
- 235/70R17: 30.0″ tall on a 17″ wheel (−0.2%)
- 245/60R18: 29.6″ tall on an 18″ wheel (−1.4%)
- 235/65R18: 30.0″ tall on an 18″ wheel (+0.1%)
- 255/55R19: 30.0″ tall on a 19″ wheel (+0.1%)
- 245/55R19: 29.6″ tall on a 19″ wheel (−1.3%)
- 265/50R20: 30.4″ tall on a 20″ wheel (+1.4%)
- 255/50R20: 30.0″ tall on a 20″ wheel (+0.1%)
- 245/50R20: 29.6″ tall on a 20″ wheel (−1.2%)
- 275/45R20: 29.7″ tall on a 20″ wheel (−0.9%)
- 265/45R21: 30.4″ tall on a 21″ wheel (+1.3%)
- 265/40R22: 30.3″ tall on a 22″ wheel (+1.2%)
Frequently asked questions
Is 30x9.50R15 a 30 inch tire?
Yes. 30x9.50R15 is 30.00 inches tall, so it's sold and talked about as a 30-inch tire.
What size is 30x9.50R15 in inches?
30x9.50R15 is 30.0 inches tall (overall diameter), 9.5 inches wide, with a 7.5 inch sidewall, and fits a 15 inch wheel.
What tire size is equivalent to 30x9.50R15?
No common size on a 15" wheel is within 1.5% of 30x9.50R15's diameter. Use the calculator above to compare any size.
What rim width fits 30x9.50R15?
As a rule of thumb, about 6.5–8.5 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 30x9.50R15 make?
About 672 revolutions per mile in theory (circumference 94.2 in). Real tires turn slightly more because they flatten under load.