ElpiAuto255/85R16 in inches
A 255/85R16 is 33.1″ tall and 10.0″ wide on a 16″ wheel — about a 33.1x10R16 in inch/flotation notation, a 33-inch tire.
Your tire size
e.g. 235/75R15, 33X12.50R15, or 225/45R17 91V
Sizes close to 255/85R16
No standard metric size lands exactly on 255/85R16. The best compromise is 265/80R16 (−1.1% height, +10 mm width); the list is ranked by height and width together, all on a 16″ wheel within ±3%.
| Size | Diameter | Height vs 255/85R16 | Width vs 255/85R16 |
|---|---|---|---|
| 265/80R16 | 32.7″ · 830 mm | −1.1% | +10 mm |
| 275/80R16 | 33.3″ · 846 mm | +0.8% | +20 mm |
| 245/85R16 | 32.4″ · 823 mm | −2.0% | −10 mm |
| 265/85R16 | 33.7″ · 857 mm | +2.0% | +10 mm |
| 285/75R16 | 32.8″ · 834 mm | −0.7% | +30 mm |
255/85R16 dimensions
Computed from the size code; moulded tires vary by brand by roughly 1–3%.
| Dimension | Inches | Millimetres |
|---|---|---|
| Overall diameter | 33.1″ | 840 |
| Section width | 10.04″ | 255 |
| Sidewall height | 8.53″ | 217 |
| Circumference | 103.9″ | 2639 |
| Revolutions per mile | 610 | — |
| Revolutions per km | — | 379 |
The same height on other wheels
If you are changing wheel diameter but want to keep a 33.1″ overall height, these metric sizes come closest (within 2%).
| Wheel | Size | Diameter | Difference |
|---|---|---|---|
| 15″ | 285/80R15 | 33.0″ | −0.3% |
| 17″ | 255/80R17 | 33.1″ | −0.0% |
| 18″ | 225/85R18 | 33.1″ | −0.0% |
| 20″ | 255/65R20 | 33.1″ | −0.0% |
| 22″ | 255/55R22 | 33.0″ | −0.1% |
Wheel width and neighbouring sizes
A 255 mm-wide tire mounts on 7.0–9.5″ wide wheels (the usual approved range; the middle is ideal).
One step down is 285/75R16: −0.7% in diameter. With a speedometer calibrated for 255/85R16, an indicated 60 mph would be 59.6 mph on 285/75R16.
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.