37x12.50R22 tire size
37x12.50R22 is a flotation (inch) size: 37.0" tall, 12.5" wide, on a 22" rim — about a 320/60R22. The sidewall is 7.5" and the tire turns 545 times per mile.
37x12.50R22 specs
| Overall diameter (height) | 37.00" · 940 mm |
|---|---|
| Section width | 12.50" · 318 mm |
| Sidewall height | 7.50" · 191 mm (60% of width) |
| Rim diameter | 22" |
| Circumference | 116.24" · 2.952 m |
| Revolutions per mile | 545 (339 per km) |
| Closest metric size | 320/60R22 |
Equivalent sizes on a 22" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 37x13.50R22 | 37.00" | 0.00% | +25 mm | 60.0 mph | compare → |
| 38x13.50R22 | 38.00" | +2.70% | +25 mm | 61.6 mph | calculate → |
| 38x15.50R22 | 38.00" | +2.70% | +76 mm | 61.6 mph | calculate → |
| 305/55R22 | 35.21" | -4.84% | -13 mm | 57.1 mph | calculate → |
| 375/45R22 | 35.29" | -4.63% | +57 mm | 57.2 mph | calculate → |
| 325/55R22 | 36.07" | -2.50% | +7 mm | 58.5 mph | calculate → |
| 335/55R22 | 36.51" | -1.33% | +17 mm | 59.2 mph | calculate → |
| 325/60R22 | 37.35" | +0.96% | +7 mm | 60.6 mph | calculate → |
| 355/60R22 | 38.77" | +4.79% | +37 mm | 62.9 mph | calculate → |
Try another size against 37x12.50R22
Questions
What size is 37x12.50R22 in inches?
37x12.50R22 is about 37.0" tall and 12.5" wide on a 22-inch rim — roughly a 320/60R22 in inch sizing.
What does 37x12.50R22 mean?
37" overall diameter, 12.50" section width, radial, 22" rim.
What tire sizes are equivalent to 37x12.50R22?
On the same 22" rim, within 3% of the diameter: 37x13.50R22 (0.00%), 325/60R22 (+0.96%), 335/55R22 (-1.33%), 325/55R22 (-2.50%), 38x13.50R22 (+2.70%), 38x15.50R22 (+2.70%).
How many revolutions per mile does a 37x12.50R22 tire make?
About 545 revolutions per mile (circumference 116.2").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.