37x12.50R17 tire size
A 37x12.50R17 tire is 37 inches (940 mm) tall and 12.5 inches (318 mm) wide by its name, for a 17-inch wheel, so each sidewall is 10 inches (254 mm). It makes about 545 revolutions a mile.
Sources checked
| Dimension | 37x12.50R17 |
|---|---|
| Overall diameter | 37.00 in (940 mm) |
| Section width | 12.50 in (318 mm) |
| Sidewall height | 10.00 in (254 mm) |
| Aspect ratio | 80% |
| Rim diameter | 17 in |
| Circumference | 116.2 in (2,952 mm) |
| Revolutions per mile | 545 |
| Revolutions per km | 339 |
Compare 37x12.50R17 with another size
Metric, LT and flotation
At 60 mph on the speedometer you’re doing
56.8mph
−5.4% · the speedometer reads high
- Height
- −2.00 in (−51 mm)
- Width
- 0.00 in (0 mm)
- Ground clearance
- −1.00 in (−25 mm)
- Each side, same wheel
- 0.00 in (0 mm)
37x12.50R17LT and 35x12.50R17LT side by side
| Dimension | 37x12.50R17LT | 35x12.50R17LT | Change |
|---|---|---|---|
| Overall diameter | 37.00 in (940 mm) | 35.00 in (889 mm) | −2.00 in (−51 mm) |
| Section width | 12.50 in (318 mm) | 12.50 in (318 mm) | 0.00 in (0 mm) |
| Sidewall height | 10.00 in (254 mm) | 9.00 in (229 mm) | −1.00 in (−25 mm) |
| Aspect ratio | 80% | 72% | |
| Rim diameter | 17 in | 17 in | |
| Circumference | 116.2 in | 110.0 in | −6.2 in |
| Revolutions per mile | 545 | 576 | +31 |
| Revolutions per km | 339 | 358 | +19 |
The working
- 37x12.50R17LT: 37.00 in tall and 12.50 in wide, as the size says.
- Sidewall = (diameter − rim) ÷ 2 = (37 − 17) ÷ 2 = 10.00 in.
- Circumference = π × 37.00 = 116.2 in; revolutions per mile = 63,360 ÷ 116.2 = 545.
- 35x12.50R17LT: 35.00 in tall and 12.50 in wide, as the size says.
- Sidewall = (diameter − rim) ÷ 2 = (35 − 17) ÷ 2 = 9.00 in.
- Circumference = π × 35.00 = 110.0 in; revolutions per mile = 63,360 ÷ 110.0 = 576.
- Speedometer. True speed = what it shows × new diameter ÷ old = 60 × 35.00 ÷ 37.00 = 56.8 mph.
- Ground clearance. Half the change in diameter: (35.00 − 37.00) ÷ 2 = −1.00 in.
Where the 37x12.50R17 numbers come from
A flotation size names its height and width: 37 inches tall and 12.5 inches wide, on a 17-inch rim. Each sidewall is what’s left: (37 − 17) ÷ 2 = 10.00 inches, so the sidewall is 80% of the width.
One turn covers π × 37.00 = 116.2 inches, so the tire turns 545 times a mile and 339 times a kilometer.
What tire makers publish for 37x12.50R17
Inflated on the maker’s measuring rim. The percentage is the printed diameter against the 37.00 inches worked out above.
| Tire | Size as printed | Diameter | Width | Revs per mile |
|---|---|---|---|---|
| Toyo Open Country A/T III | 37X12.50R17LT | 36.5 in (−1.4%) | 12.5 in | 569 |
| Nitto Trail Grappler M/T | 37x12.50R17LT | 36.85 in (−0.4%) | 13.43 in | – |
Other 17-inch sizes against 37x12.50R17
Each size’s height against 37x12.50R17, and what a speedometer set for 37x12.50R17 shows at 60 mph with that size on.
| Size | Diameter | Width | Height change | At 60 mph shown |
|---|---|---|---|---|
| 215/45R17 | 24.6 in | 8.5 in | −33.5% | 39.9 mph |
| 215/50R17 | 25.5 in | 8.5 in | −31.2% | 41.3 mph |
| 215/55R17 | 26.3 in | 8.5 in | −28.9% | 42.7 mph |
| 215/60R17 | 27.2 in | 8.5 in | −26.6% | 44.0 mph |
| 225/45R17 | 25.0 in | 8.9 in | −32.5% | 40.5 mph |
| 225/50R17 | 25.9 in | 8.9 in | −30.1% | 41.9 mph |
| 225/55R17 | 26.7 in | 8.9 in | −27.7% | 43.4 mph |
| 225/60R17 | 27.6 in | 8.9 in | −25.3% | 44.8 mph |
| 225/65R17 | 28.5 in | 8.9 in | −22.9% | 46.2 mph |
| 235/55R17 | 27.2 in | 9.3 in | −26.5% | 44.1 mph |
| 235/60R17 | 28.1 in | 9.3 in | −24.0% | 45.6 mph |
| 235/65R17 | 29.0 in | 9.3 in | −21.5% | 47.1 mph |
| 245/65R17 | 29.5 in | 9.6 in | −20.2% | 47.9 mph |
| 245/70R17 | 30.5 in | 9.6 in | −17.6% | 49.5 mph |
| 245/75R17 | 31.5 in | 9.6 in | −14.9% | 51.0 mph |
| 255/70R17 | 31.1 in | 10.0 in | −16.1% | 50.4 mph |
| 265/65R17 | 30.6 in | 10.4 in | −17.4% | 49.6 mph |
| 265/70R17 | 31.6 in | 10.4 in | −14.6% | 51.3 mph |
| 275/70R17 | 32.2 in | 10.8 in | −13.1% | 52.1 mph |
| 285/70R17 | 32.7 in | 11.2 in | −11.6% | 53.0 mph |
| 285/75R17 | 33.8 in | 11.2 in | −8.6% | 54.9 mph |
| 315/70R17 | 34.4 in | 12.4 in | −7.1% | 55.7 mph |
| 33x12.50R17 | 33.0 in | 12.5 in | −10.8% | 53.5 mph |
| 35x12.50R17 compared | 35.0 in | 12.5 in | −5.4% | 56.8 mph |
37x12.50R17 compared
Every size: the tire size calculator. With the wheels off, the nuts go back on at your vehicle’s lug nut torque.
Questions
How tall is a 37x12.50R17 tire really?
37 inches by its name. Measured inflated, the makers’ tables on this page give 36.5 to 36.85 inches. Tread depth and the rim it’s measured on make the difference.
How many revolutions per mile does a 37x12.50R17 make?
545 by its diameter: 63,360 inches in a mile ÷ 116.2 inches a turn. Tire makers’ published figures are measured under load, when the tire rolls on a slightly smaller radius, and run 2.8% to 3.3% higher in Toyo’s tables.
Is 37x12.50R17 an LT tire?
Yes. Bridgestone’s guide describes flotation sizes as light-truck tires, written with LT after the rim: 37x12.50R17LT. They carry one load index, as they’re not made to run as duals.
Sources
- Bridgestone Americas: Determining tire size: P-metric, Euro-metric, LT-metric, C-type and flotation sizes, and what each number means (checked October 28, 2026)
- Toyo Tires: Extensa A/S II sizes and specifications: inflated overall diameter and width, revolutions per mile (checked October 28, 2026)
- Toyo Tires: Proxes Sport A/S sizes and specifications: inflated overall diameter and width, revolutions per mile (checked October 28, 2026)
- Toyo Tires: Open Country A/T III sizes and specifications: P-metric, LT-metric and flotation sizes, with revolutions per mile (checked October 28, 2026)
- Nitto Tire: Trail Grappler M/T sizes and specs: inflated overall diameter and width, LT-metric and flotation sizes (checked October 28, 2026)
Spotted a number that doesn’t match your manual or a source? Tell us; corrections are logged on the sources page.