ElpiAuto285/75R17 in inches
A 285/75R17 is 33.8″ tall and 11.2″ wide on a 17″ wheel — about a 33.8x11.2R17 in inch/flotation notation, a 34-inch tire.
Your tire size
e.g. 235/75R15, 33X12.50R15, or 225/45R17 91V
Sizes close to 285/75R17
No standard metric size lands exactly on 285/75R17. The best compromise is 305/70R17 (−0.1% height, +20 mm width); the list is ranked by height and width together, all on a 17″ wheel within ±3%.
| Size | Diameter | Height vs 285/75R17 | Width vs 285/75R17 |
|---|---|---|---|
| 305/70R17 | 33.8″ · 859 mm | −0.1% | +20 mm |
| 265/80R17 | 33.7″ · 856 mm | −0.4% | −20 mm |
| 275/80R17 | 34.3″ · 872 mm | +1.5% | −10 mm |
| 295/70R17 | 33.3″ · 845 mm | −1.7% | +10 mm |
| 275/75R17 | 33.2″ · 844 mm | −1.7% | −10 mm |
285/75R17 dimensions
Computed from the size code; moulded tires vary by brand by roughly 1–3%.
| Dimension | Inches | Millimetres |
|---|---|---|
| Overall diameter | 33.8″ | 859 |
| Section width | 11.22″ | 285 |
| Sidewall height | 8.42″ | 214 |
| Circumference | 106.3″ | 2700 |
| Revolutions per mile | 596 | — |
| Revolutions per km | — | 370 |
The same height on other wheels
If you are changing wheel diameter but want to keep a 33.8″ overall height, these metric sizes come closest (within 2%).
| Wheel | Size | Diameter | Difference |
|---|---|---|---|
| 15″ | 315/75R15 | 33.6″ | −0.7% |
| 16″ | 265/85R16 | 33.7″ | −0.3% |
| 18″ | 285/70R18 | 33.7″ | −0.4% |
| 20″ | 295/60R20 | 33.9″ | +0.3% |
| 22″ | 275/55R22 | 33.9″ | +0.2% |
Wheel width and neighbouring sizes
A 285 mm-wide tire mounts on 8.5–11.0″ wide wheels (the usual approved range; the middle is ideal).
One step down is 33X12.50R17: −2.5% in diameter. With a speedometer calibrated for 285/75R17, an indicated 60 mph would be 58.5 mph on 33X12.50R17.
One step up is 315/70R17: +1.6% in diameter. With a speedometer calibrated for 285/75R17, an indicated 60 mph would be 60.9 mph on 315/70R17.
Figures are geometric: overall diameter = wheel + 2 × sidewall, 25.4 mm per inch. Check the tire maker's data sheet for the exact moulded size before buying.