37x13.50R18 tire size in inches
A 37x13.50R18 tire measures
37.0" tall × 13.5" wide
9.50" sidewall on a 18" wheel. 545 revolutions per mile.
37x13.50R18 is a flotation (inch) size: 37 inches tall, 13.50 inches wide, for a 18 inch wheel. The R means radial construction.
37x13.50R18 specs
| Overall diameter (height) | 37.00 inches (940 mm) |
|---|---|
| Section width | 13.50 inches (343 mm) |
| Sidewall height | 9.50 inches (241 mm) |
| Wheel (rim) diameter | 18 inches |
| Circumference | 116.2 inches (2,952 mm) |
| Revolutions per mile | 545 |
| Revolutions per kilometer | 339 |
| Approximate rim width | 9.5" to 12.0" |
| Aspect ratio (equivalent) | 70% |
Calculated from the size. Real tires differ by brand, model and tread depth, typically by a few tenths of an inch.
Sizes that can replace 37x13.50R18 on a 18" wheel
These 18" sizes are within 3% of 37x13.50R18's overall diameter, the range most tire shops treat as interchangeable.
| Size | Diameter | Width | Difference | Real speed at 60 | |
|---|---|---|---|---|---|
| 37x12.50R18 | 37.00" | 12.50" | 0.0% | 60.0 mph | Compare |
| 325/70R18 | 35.91" | 12.80" | −2.9% | 58.2 mph | Compare |
Same height on other wheel sizes (plus and minus sizing)
| Size | Wheel | Diameter | Difference | |
|---|---|---|---|---|
| 37x12.50R17 | 17" | 37.00" | 0.0% | Compare |
| 37x12.50R20 | 20" | 37.00" | 0.0% | Compare |
| 37x13.50R17 | 17" | 37.00" | 0.0% | Compare |
| 37x13.50R20 | 20" | 37.00" | 0.0% | Compare |
| 37x13.50R22 | 22" | 37.00" | 0.0% | Compare |
| 38x13.50R20 | 20" | 38.00" | +2.7% | Compare |
| 355/50R22 | 22" | 35.98" | −2.8% | Compare |
| 345/55R21 | 21" | 35.94" | −2.9% | Compare |
Compare 37x13.50R18 with another size
Questions
- How tall is a 37x13.50R18 tire?
- A 37x13.50R18 tire is 37.0 inches tall (940 mm), calculated from the size. It is 13.5 inches wide with 9.5 inches sidewalls. Real tires vary by a few tenths of an inch between brands and tread patterns.
- What does 37x13.50R18 mean?
- 37x13.50R18 is a flotation (inch) size: 37 inches tall, 13.50 inches wide, for a 18 inch wheel. The R means radial construction.
- How many revolutions per mile does a 37x13.50R18 tire make?
- About 545 revolutions per mile, based on a circumference of 116.2 inches. Under load the tire flattens slightly, so the maker's published figure is usually a little higher.
- What rim width fits a 37x13.50R18 tire?
- Roughly 9.5" to 12.0". Check the tire maker's approved rim range for the exact model before buying wheels.
- Can I use 37x12.50R18 instead of 37x13.50R18?
- 37x12.50R18 is 0.00 inches (0.0%) in overall diameter, so at an indicated 60 mph you would be doing 60.0 mph. Differences under 3% are usually fine, but check clearance, load index and your vehicle's placard.