30x9.50R15 in metric
| Measure | Inches | Millimetres |
|---|---|---|
| Overall height | 30.00 in | 762 mm |
| Width | 9.50 in | 241 mm |
| Sidewall | 7.50 in | 190 mm |
| Wheel | 15 in | 381 mm |
| Revs per mile | 672.3 |
Flotation sizes are written as height × width R wheel in inches, so 30x9.50R15 is 30 in tall and 9.50 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 |
|---|---|---|---|
| 225/85R15 (compare) | 30.1 in | +0.06 in | 8.9 in |
| 255/75R15 (compare) | 30.1 in | +0.06 in | 10.0 in |
| 235/80R15 (compare) | 29.8 in | −0.20 in | 9.3 in |
| 265/70R15 (compare) | 29.6 in | −0.39 in | 10.4 in |
| 245/80R15 (compare) | 30.4 in | +0.43 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 30x9.50R15 from a smaller tire
| From | Height change | 60 mph on the speedometer is really | Verdict |
|---|---|---|---|
| 235/55R19 | +2.8% (+0.82 in) | 61.7 mph | Close match |
| 295/35R21 | +3.0% (+0.87 in) | 61.8 mph | Close match |
| 235/60R18 | +3.1% (+0.90 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.