Tire Ruler255/80R17 dimensions
| Overall diameter (height) | 33.06″ · 840 mm |
| Section width | 10.04″ · 255 mm |
| Sidewall height | 8.03″ · 204 mm |
| Wheel diameter | 17″ |
| Rim width (rule of thumb) | 7–9″ |
| Circumference | 103.9″ |
| Revolutions per mile | 610 |
| In inches (flotation style) | 33.1 × 10.0R17 |
How it’s calculated: the sidewall is 80% of the 255 mm width = 204.0 mm (8.03″). Add two sidewalls to the 17″ wheel: 17 + 2 × 8.03 = 33.06″.
Bigger tires than 255/80R17 on 17″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 285/75R17 | 33.8″ | +0.77″ (+2.3%) | 61.4 mph |
| 34x10.50R17 | 34.0″ | +0.94″ (+2.8%) | 61.7 mph |
| 315/70R17 | 34.4″ | +1.30″ (+3.9%) | 62.4 mph |
| 35x12.50R17 | 35.0″ | +1.94″ (+5.9%) | 63.5 mph |
“60 mph reads” is your real speed when a speedometer set up for 255/80R17 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 255/80R17
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 |
|---|---|---|---|
| 33x12.50R17 | 33.0″ | 12.5″ | −0.2% |
| 295/70R17 | 33.3″ | 11.6″ | +0.6% |
| 285/70R17 | 32.7″ | 11.2″ | −1.1% |
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 (−0.2%)
- 285/75R16: 32.8″ tall on a 16″ wheel (−0.7%)
- 275/70R18: 33.2″ tall on an 18″ wheel (+0.3%)
- 285/65R18: 32.6″ tall on an 18″ wheel (−1.4%)
- 265/70R18: 32.6″ tall on an 18″ wheel (−1.4%)
- 33x12.50R18: 33.0″ tall on an 18″ wheel (−0.2%)
- 275/60R20: 33.0″ tall on a 20″ wheel (−0.2%)
- 285/60R20: 33.5″ tall on a 20″ wheel (+1.2%)
- 305/55R20: 33.2″ tall on a 20″ wheel (+0.4%)
- 295/55R20: 32.8″ tall on a 20″ wheel (−0.9%)
- 33x12.50R20: 33.0″ tall on a 20″ wheel (−0.2%)
- 305/45R22: 32.8″ tall on a 22″ wheel (−0.8%)
- 275/50R22: 32.8″ tall on a 22″ wheel (−0.7%)
- 33x12.50R22: 33.0″ tall on a 22″ wheel (−0.2%)
Frequently asked questions
Is 255/80R17 a 33 inch tire?
Yes. 255/80R17 is 33.06 inches tall, so it's sold and talked about as a 33-inch tire.
What size is 255/80R17 in inches?
255/80R17 is 33.1 inches tall (overall diameter), 10.0 inches wide, with a 8.0 inch sidewall, and fits a 17 inch wheel.
What tire size is equivalent to 255/80R17?
Sizes within 1.5% of the same diameter on a 17" wheel: 33x12.50R17 (33.0"), 295/70R17 (33.3"), 285/70R17 (32.7"). Check load index and width before swapping.
What rim width fits 255/80R17?
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 255/80R17 make?
About 610 revolutions per mile in theory (circumference 103.9 in). Real tires turn slightly more because they flatten under load.