ElpiAuto285/70R17 in inches
A 285/70R17 is 32.7″ tall and 11.2″ wide on a 17″ wheel — about a 32.7x11.2R17 in inch/flotation notation, a 33-inch tire.
Your tire size
e.g. 235/75R15, 33X12.50R15, or 225/45R17 91V
Sizes close to 285/70R17
No standard metric size lands exactly on 285/70R17. The best compromise is 265/75R17 (−0.2% height, −20 mm width); the list is ranked by height and width together, all on a 17″ wheel within ±3%.
| Size | Diameter | Height vs 285/70R17 | Width vs 285/70R17 |
|---|---|---|---|
| 265/75R17 | 32.6″ · 829 mm | −0.2% | −20 mm |
| 305/65R17 | 32.6″ · 828 mm | −0.3% | +20 mm |
| 275/75R17 | 33.2″ · 844 mm | +1.6% | −10 mm |
| 295/70R17 | 33.3″ · 845 mm | +1.7% | +10 mm |
| 275/70R17 | 32.2″ · 817 mm | −1.7% | −10 mm |
285/70R17 dimensions
Computed from the size code; moulded tires vary by brand by roughly 1–3%.
| Dimension | Inches | Millimetres |
|---|---|---|
| Overall diameter | 32.7″ | 831 |
| Section width | 11.22″ | 285 |
| Sidewall height | 7.85″ | 200 |
| Circumference | 102.8″ | 2610 |
| Revolutions per mile | 617 | — |
| Revolutions per km | — | 383 |
The same height on other wheels
If you are changing wheel diameter but want to keep a 32.7″ overall height, these metric sizes come closest (within 2%).
| Wheel | Size | Diameter | Difference |
|---|---|---|---|
| 15″ | 265/85R15 | 32.7″ | +0.1% |
| 16″ | 265/80R16 | 32.7″ | −0.0% |
| 18″ | 265/70R18 | 32.6″ | −0.3% |
| 20″ | 295/55R20 | 32.8″ | +0.2% |
| 22″ | 275/50R22 | 32.8″ | +0.4% |
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 265/70R17: −3.4% in diameter. With a speedometer calibrated for 285/70R17, an indicated 60 mph would be 58.0 mph on 265/70R17.
One step up is 33X12.50R17: +0.9% in diameter. With a speedometer calibrated for 285/70R17, an indicated 60 mph would be 60.5 mph on 33X12.50R17.
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.