Tire Ruler255/75R17 dimensions
| Overall diameter (height) | 32.06″ · 814 mm |
| Section width | 10.04″ · 255 mm |
| Sidewall height | 7.53″ · 191 mm |
| Wheel diameter | 17″ |
| Rim width (rule of thumb) | 7–9″ |
| Circumference | 100.7″ |
| Revolutions per mile | 629 |
| In inches (flotation style) | 32.1 × 10.0R17 |
How it’s calculated: the sidewall is 75% of the 255 mm width = 191.3 mm (7.53″). Add two sidewalls to the 17″ wheel: 17 + 2 × 7.53 = 32.06″.
Bigger tires than 255/75R17 on 17″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 285/70R17 | 32.7″ | +0.65″ (+2.0%) | 61.2 mph |
| 33x12.50R17 | 33.0″ | +0.94″ (+2.9%) | 61.8 mph |
| 255/80R17 | 33.1″ | +1.00″ (+3.1%) | 61.9 mph |
| 295/70R17 | 33.3″ | +1.20″ (+3.7%) | 62.2 mph |
| 285/75R17 | 33.8″ | +1.77″ (+5.5%) | 63.3 mph |
“60 mph reads” is your real speed when a speedometer set up for 255/75R17 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 255/75R17
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 |
|---|---|---|---|
| 275/70R17 | 32.2″ | 10.8″ | +0.3% |
| 265/70R17 | 31.6″ | 10.4″ | −1.4% |
Same height on a different wheel size
Changing wheel size (plus or minus sizing) while keeping the overall height keeps your speedometer right:
- 32x11.50R15: 32.0″ tall on a 15″ wheel (−0.2%)
- 265/75R16: 31.6″ tall on a 16″ wheel (−1.3%)
- 235/85R16: 31.7″ tall on a 16″ wheel (−1.0%)
- 275/65R18: 32.1″ tall on an 18″ wheel (+0.0%)
- 255/70R18: 32.1″ tall on an 18″ wheel (−0.0%)
- 275/55R20: 31.9″ tall on a 20″ wheel (−0.5%)
- 285/55R20: 32.3″ tall on a 20″ wheel (+0.9%)
- 265/60R20: 32.5″ tall on a 20″ wheel (+1.4%)
- 305/50R20: 32.0″ tall on a 20″ wheel (−0.2%)
- 285/45R22: 32.1″ tall on a 22″ wheel (+0.1%)
- 275/45R22: 31.7″ tall on a 22″ wheel (−1.0%)
Popular 255/75R17 comparisons
Frequently asked questions
Is 255/75R17 a 32 inch tire?
Yes. 255/75R17 is 32.06 inches tall, so it's sold and talked about as a 32-inch tire.
What size is 255/75R17 in inches?
255/75R17 is 32.1 inches tall (overall diameter), 10.0 inches wide, with a 7.5 inch sidewall, and fits a 17 inch wheel.
What tire size is equivalent to 255/75R17?
Sizes within 1.5% of the same diameter on a 17" wheel: 275/70R17 (32.2"), 265/70R17 (31.6"). Check load index and width before swapping.
What rim width fits 255/75R17?
As a rule of thumb, about 7–9 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 255/75R17 make?
About 629 revolutions per mile in theory (circumference 100.7 in). Real tires turn slightly more because they flatten under load.