Tire Ruler285/70R17 dimensions
| Overall diameter (height) | 32.71″ · 831 mm |
| Section width | 11.22″ · 285 mm |
| Sidewall height | 7.85″ · 200 mm |
| Wheel diameter | 17″ |
| Rim width (rule of thumb) | 8–10″ |
| Circumference | 102.8″ |
| Revolutions per mile | 617 |
| In inches (flotation style) | 32.7 × 11.2R17 |
How it’s calculated: the sidewall is 70% of the 285 mm width = 199.5 mm (7.85″). Add two sidewalls to the 17″ wheel: 17 + 2 × 7.85 = 32.71″.
Bigger tires than 285/70R17 on 17″ wheels
| Size | Height | Taller by | 60 mph reads |
|---|---|---|---|
| 33x12.50R17 | 33.0″ | +0.29″ (+0.9%) | 60.5 mph |
| 255/80R17 | 33.1″ | +0.35″ (+1.1%) | 60.6 mph |
| 295/70R17 | 33.3″ | +0.55″ (+1.7%) | 61.0 mph |
| 285/75R17 | 33.8″ | +1.12″ (+3.4%) | 62.1 mph |
| 34x10.50R17 | 34.0″ | +1.29″ (+3.9%) | 62.4 mph |
“60 mph reads” is your real speed when a speedometer set up for 285/70R17 shows 60. Above about 3% taller, most trucks need a leveling kit or lift, and the speedometer should be recalibrated.
Sizes equivalent to 285/70R17
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″ | +0.9% |
| 255/80R17 | 33.1″ | 10.0″ | +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 (+0.9%)
- 285/75R16: 32.8″ tall on a 16″ wheel (+0.4%)
- 275/70R18: 33.2″ tall on an 18″ wheel (+1.4%)
- 285/65R18: 32.6″ tall on an 18″ wheel (−0.4%)
- 265/70R18: 32.6″ tall on an 18″ wheel (−0.3%)
- 33x12.50R18: 33.0″ tall on an 18″ wheel (+0.9%)
- 275/60R20: 33.0″ tall on a 20″ wheel (+0.9%)
- 285/55R20: 32.3″ tall on a 20″ wheel (−1.1%)
- 295/55R20: 32.8″ tall on a 20″ wheel (+0.2%)
- 265/60R20: 32.5″ tall on a 20″ wheel (−0.6%)
- 33x12.50R20: 33.0″ tall on a 20″ wheel (+0.9%)
- 305/45R22: 32.8″ tall on a 22″ wheel (+0.3%)
- 275/50R22: 32.8″ tall on a 22″ wheel (+0.4%)
- 33x12.50R22: 33.0″ tall on a 22″ wheel (+0.9%)
Popular 285/70R17 comparisons
Frequently asked questions
Is 285/70R17 a 33 inch tire?
Not quite. 285/70R17 is 32.71 inches tall, between a 32 and a 33 inch tire.
What size is 285/70R17 in inches?
285/70R17 is 32.7 inches tall (overall diameter), 11.2 inches wide, with a 7.9 inch sidewall, and fits a 17 inch wheel.
What tire size is equivalent to 285/70R17?
Sizes within 1.5% of the same diameter on a 17" wheel: 33x12.50R17 (33.0"), 255/80R17 (33.1"). Check load index and width before swapping.
What rim width fits 285/70R17?
As a rule of thumb, about 8–10 inches. The tire maker's spec sheet lists the approved range for each model.
How many revolutions per mile does 285/70R17 make?
About 617 revolutions per mile in theory (circumference 102.8 in). Real tires turn slightly more because they flatten under load.