ElpiAuto235/75R15 in inches
A 235/75R15 is 28.9″ tall and 9.3″ wide on a 15″ wheel — about a 28.9x9.3R15 in inch/flotation notation, a 29-inch tire.
Your tire size
e.g. 235/75R15, 33X12.50R15, or 225/45R17 91V
Sizes close to 235/75R15
No standard metric size lands exactly on 235/75R15. The best compromise is 225/80R15 (+1.0% height, −10 mm width); the list is ranked by height and width together, all on a 15″ wheel within ±3%.
| Size | Diameter | Height vs 235/75R15 | Width vs 235/75R15 |
|---|---|---|---|
| 225/80R15 | 29.2″ · 741 mm | +1.0% | −10 mm |
| 245/70R15 | 28.5″ · 724 mm | −1.3% | +10 mm |
| 255/70R15 | 29.1″ · 738 mm | +0.6% | +20 mm |
| 225/75R15 | 28.3″ · 718 mm | −2.0% | −10 mm |
| 245/75R15 | 29.5″ · 749 mm | +2.0% | +10 mm |
235/75R15 dimensions
Computed from the size code; moulded tires vary by brand by roughly 1–3%.
| Dimension | Inches | Millimetres |
|---|---|---|
| Overall diameter | 28.9″ | 733 |
| Section width | 9.25″ | 235 |
| Sidewall height | 6.94″ | 176 |
| Circumference | 90.7″ | 2304 |
| Revolutions per mile | 698 | — |
| Revolutions per km | — | 434 |
The same height on other wheels
If you are changing wheel diameter but want to keep a 28.9″ overall height, these metric sizes come closest (within 2%).
| Wheel | Size | Diameter | Difference |
|---|---|---|---|
| 16″ | 235/70R16 | 29.0″ | +0.3% |
| 17″ | 235/65R17 | 29.0″ | +0.5% |
| 18″ | 255/55R18 | 29.0″ | +0.6% |
| 20″ | 225/50R20 | 28.9″ | −0.1% |
Wheel width and neighbouring sizes
A 235 mm-wide tire mounts on 6.5–9.0″ wide wheels (the usual approved range; the middle is ideal).
One step up is 30X9.50R15: +3.9% in diameter. With a speedometer calibrated for 235/75R15, an indicated 60 mph would be 62.3 mph on 30X9.50R15.
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.