ElpiAuto275/60R20 in inches
A 275/60R20 is 33.0″ tall and 10.8″ wide on a 20″ wheel — about a 33x10.8R20 in inch/flotation notation, a 33-inch tire.
Your tire size
e.g. 235/75R15, 33X12.50R15, or 225/45R17 91V
Sizes close to 275/60R20
No standard metric size lands exactly on 275/60R20. The best compromise is 255/65R20 (+0.2% height, −20 mm width); the list is ranked by height and width together, all on a 20″ wheel within ±3%.
| Size | Diameter | Height vs 275/60R20 | Width vs 275/60R20 |
|---|---|---|---|
| 255/65R20 | 33.1″ · 840 mm | +0.2% | −20 mm |
| 265/60R20 | 32.5″ · 826 mm | −1.4% | −10 mm |
| 285/60R20 | 33.5″ · 850 mm | +1.4% | +10 mm |
| 295/55R20 | 32.8″ · 833 mm | −0.7% | +20 mm |
| 265/65R20 | 33.6″ · 853 mm | +1.7% | −10 mm |
275/60R20 dimensions
Computed from the size code; moulded tires vary by brand by roughly 1–3%.
| Dimension | Inches | Millimetres |
|---|---|---|
| Overall diameter | 33.0″ | 838 |
| Section width | 10.83″ | 275 |
| Sidewall height | 6.50″ | 165 |
| Circumference | 103.6″ | 2633 |
| Revolutions per mile | 611 | — |
| Revolutions per km | — | 380 |
The same height on other wheels
If you are changing wheel diameter but want to keep a 33.0″ overall height, these metric sizes come closest (within 2%).
| Wheel | Size | Diameter | Difference |
|---|---|---|---|
| 15″ | 305/75R15 | 33.0″ | +0.1% |
| 16″ | 255/85R16 | 33.1″ | +0.2% |
| 17″ | 255/80R17 | 33.1″ | +0.2% |
| 18″ | 255/75R18 | 33.1″ | +0.2% |
| 22″ | 255/55R22 | 33.0″ | +0.2% |
Wheel width and neighbouring sizes
A 275 mm-wide tire mounts on 8.0–10.5″ wide wheels (the usual approved range; the middle is ideal).
One step down is 275/55R20: −3.3% in diameter. With a speedometer calibrated for 275/60R20, an indicated 60 mph would be 58.0 mph on 275/55R20.
One step up is 305/55R20: +0.7% in diameter. With a speedometer calibrated for 275/60R20, an indicated 60 mph would be 60.4 mph on 305/55R20.
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.