31x10.50R15 in metric
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 31.00 in | 787 mm |
| Width | 10.50 in | 267 mm |
| Sidewall | 8.00 in | 203 mm |
| Wheel | 15 in | 381 mm |
| Revs per mile | 650.6 |
Flotation sizes are written as height × width R wheel in inches, so 31x10.50R15 is 31 in tall and 10.50 in wide by definition. Metric sizes are written in millimetres, so there is no exact twin: these are the closest calculated metric sizes on a 15 in wheel.
Closest calculated metric sizes
| Size | Height | Off by | Width |
|---|---|---|---|
| 255/80R15 (compare) | 31.1 in | +0.06 in | 10.0 in |
| 275/75R15 (compare) | 31.2 in | +0.24 in | 10.8 in |
| 295/70R15 (compare) | 31.3 in | +0.26 in | 11.6 in |
| 285/70R15 (compare) | 30.7 in | −0.29 in | 11.2 in |
| 265/75R15 (compare) | 30.6 in | −0.35 in | 10.4 in |
| 245/85R15 (compare) | 31.4 in | +0.40 in | 9.6 in |
These are calculated combinations of standard widths and aspect ratios, not a list of tires that are sold: confirm a tire is made in that size, and that it suits your wheel width.
Moving up to 31x10.50R15 from a smaller tire
| From | Height change | 60 mph on the speedometer is really | Verdict |
|---|---|---|---|
| 235/55R20 | +2.7% (+0.82 in) | 61.6 mph | Close match |
| 285/45R20 | +3.0% (+0.90 in) | 61.8 mph | Close match |
| 255/70R16 | +3.1% (+0.94 in) | 61.9 mph | Check clearance |
Regearing
A tire this size is taller than most stock tires, so engine RPM falls at a given speed. See the gear ratio calculator and the regear chart.
Calculated from the size alone. Real tires vary a little by brand and model, and the loaded radius is a bit smaller. Confirm the wheel width range, clearance, load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.