ElpiAuto35X12.50R18 in metric
A 35X12.50R18 is 35.0″ (889 mm) tall and 12.50″ (318 mm) wide on a 18″ wheel. Converted directly it reads 320/65R18; the nearest standard metric size is 315/70R18.
Your tire size
e.g. 235/75R15, 33X12.50R15, or 225/45R17 91V
Metric equivalents of 35X12.50R18
No standard metric size lands exactly on 35X12.50R18. The best compromise is 315/70R18 (+1.0% height, −3 mm width); the list is ranked by height and width together, all on a 18″ wheel within ±3%.
| Size | Diameter | Height vs 35X12.50R18 | Width vs 35X12.50R18 |
|---|---|---|---|
| 315/70R18 | 35.4″ · 898 mm | +1.0% | −3 mm |
| 305/70R18 | 34.8″ · 884 mm | −0.5% | −13 mm |
| 325/65R18 | 34.6″ · 880 mm | −1.0% | +8 mm |
| 335/65R18 | 35.1″ · 893 mm | +0.4% | +18 mm |
| 315/65R18 | 34.1″ · 867 mm | −2.5% | −3 mm |
35X12.50R18 dimensions
Computed from the size code; moulded tires vary by brand by roughly 1–3%.
| Dimension | Inches | Millimetres |
|---|---|---|
| Overall diameter | 35.0″ | 889 |
| Section width | 12.50″ | 318 |
| Sidewall height | 8.50″ | 216 |
| Circumference | 110.0″ | 2793 |
| Revolutions per mile | 576 | — |
| Revolutions per km | — | 358 |
The same height on other wheels
If you are changing wheel diameter but want to keep a 35.0″ overall height, these metric sizes come closest (within 2%).
| Wheel | Size | Diameter | Difference |
|---|---|---|---|
| 15″ | 315/80R15 | 34.8″ | −0.4% |
| 16″ | 345/70R16 | 35.0″ | +0.0% |
| 17″ | 305/75R17 | 35.0″ | +0.0% |
| 20″ | 345/55R20 | 34.9″ | −0.2% |
| 22″ | 335/50R22 | 35.2″ | +0.5% |
Wheel width and neighbouring sizes
A 318 mm-wide tire mounts on 9.5–12.0″ wide wheels (the usual approved range; the middle is ideal).
One step down is 275/70R18: −5.3% in diameter. With a speedometer calibrated for 35X12.50R18, an indicated 60 mph would be 56.8 mph on 275/70R18.
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.