Tire Ruler245/75R17 dimensions
| Overall diameter (height) | 31.47″ · 799 mm |
| Section width | 9.65″ · 245 mm |
| Sidewall height | 7.23″ · 184 mm |
| Wheel diameter | 17″ |
| Rim width (rule of thumb) | 7–8.5″ |
| Circumference | 98.9″ |
| Revolutions per mile | 641 |
| In inches (flotation style) | 31.5 × 9.6R17 |
How it’s calculated: the sidewall is 75% of the 245 mm width = 183.8 mm (7.23″). Add two sidewalls to the 17″ wheel: 17 + 2 × 7.23 = 31.47″.
Bigger tires than 245/75R17 on 17″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 255/75R17 | 32.1″ | +0.59″ (+1.9%) | 61.1 mph |
| 275/70R17 | 32.2″ | +0.69″ (+2.2%) | 61.3 mph |
| 285/70R17 | 32.7″ | +1.24″ (+3.9%) | 62.4 mph |
| 33x12.50R17 | 33.0″ | +1.53″ (+4.9%) | 62.9 mph |
| 255/80R17 | 33.1″ | +1.59″ (+5.1%) | 63.0 mph |
“60 mph reads” is your real speed when a speedometer set up for 245/75R17 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 245/75R17
Within 1.5% of the same height on a 17″ wheel. Usually interchangeable for the speedometer; check width, load index and clearance.
| Size | Height | Width | Difference |
|---|---|---|---|
| 265/70R17 | 31.6″ | 10.4″ | +0.4% |
| 275/65R17 | 31.1″ | 10.8″ | −1.3% |
| 255/70R17 | 31.1″ | 10.0″ | −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:
- 31x10.50R15: 31.0″ tall on a 15″ wheel (−1.5%)
- 265/75R16: 31.6″ tall on a 16″ wheel (+0.6%)
- 235/85R16: 31.7″ tall on a 16″ wheel (+0.8%)
- 265/65R18: 31.6″ tall on an 18″ wheel (+0.3%)
- 255/65R18: 31.1″ tall on an 18″ wheel (−1.3%)
- 255/60R19: 31.0″ tall on a 19″ wheel (−1.3%)
- 275/55R20: 31.9″ tall on a 20″ wheel (+1.4%)
- 245/60R20: 31.6″ tall on a 20″ wheel (+0.3%)
- 255/55R20: 31.0″ tall on a 20″ wheel (−1.4%)
- 285/50R20: 31.2″ tall on a 20″ wheel (−0.8%)
- 275/45R22: 31.7″ tall on a 22″ wheel (+0.9%)
Popular 245/75R17 comparisons
Frequently asked questions
Is 245/75R17 a 31 inch tire?
Not quite. 245/75R17 is 31.47 inches tall, between a 31 and a 32 inch tire.
What size is 245/75R17 in inches?
245/75R17 is 31.5 inches tall (overall diameter), 9.6 inches wide, with a 7.2 inch sidewall, and fits a 17 inch wheel.
What tire size is equivalent to 245/75R17?
Sizes within 1.5% of the same diameter on a 17" wheel: 265/70R17 (31.6"), 275/65R17 (31.1"), 255/70R17 (31.1"). Check load index and width before swapping.
What rim width fits 245/75R17?
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 245/75R17 make?
About 641 revolutions per mile in theory (circumference 98.9 in). Real tires turn slightly more because they flatten under load.