37.0" tall, 13.5" wide on a 18" wheel
A 37x13.50R18 tire is 37.0 inches tall and 13.5 inches wide and mounts on a 18-inch wheel, which leaves a 9.5-inch sidewall. It turns about 545 times per mile.
The size most often compared with it is 325/70R18, which is 1.1" shorter (−2.9%). At an indicated 60 mph you would be doing 58.2 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 18" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 37x13.50R18 | |
|---|---|---|---|---|---|
| 325/70R18 | 35.9" | 12.8" | 9.0" | −2.9% | |
| 325/65R18 | 34.6" | 12.8" | 8.3" | −6.4% | |
| 325/60R18 | 33.4" | 12.8" | 7.7" | −9.9% |
Sizes within 2% of 37.0" on 20" or 17" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 37x13.50R18 | |
|---|---|---|---|---|---|
| 37x11.50R20 | 37.0" | 11.5" | 8.5" | ±0.0% | |
| 37x12.50R17 | 37.0" | 12.5" | 10.0" | ±0.0% | |
| 37x12.50R20 | 37.0" | 12.5" | 8.5" | ±0.0% | |
| 37x13.50R17 | 37.0" | 13.5" | 10.0" | ±0.0% | |
| 37x13.50R20 | 37.0" | 13.5" | 8.5" | ±0.0% | |
| 325/80R16 | 36.5" | 12.8" | 10.2" | −1.4% |
Actual speed when the speedometer is calibrated for 37x13.50R18.
| Speedometer shows | on 325/70R18 | on 325/65R18 | on 325/60R18 |
|---|---|---|---|
| 30 mph | 29.1 mph | 28.1 mph | 27.0 mph |
| 45 mph | 43.7 mph | 42.1 mph | 40.6 mph |
| 60 mph | 58.2 mph | 56.2 mph | 54.1 mph |
| 70 mph | 67.9 mph | 65.5 mph | 63.1 mph |
37.0 inches (940 mm), with a 9.5-inch sidewall on a 18-inch wheel.
There is no common metric size within half an inch of 37.0".
About 545, or 339 per kilometer.