37x12.50R20 Tire Size: 37.0" Tall
Straight answer
A 37x12.50R20 stands 37.0 inches tall and 12.5 inches wide on a 20-inch wheel. NTW stocks 24 tire models in this size right now.
37x12.50R20 dimensions
Overall diameter
37.00"
Section width
12.50"
Sidewall height
8.50"
Wheel diameter
20"
Circumference
116.2"
Revolutions per mile
545
≈ 318/68R20 metric. Nominal math; real tires run a few tenths off depending on brand, load range, rim width, and air pressure.
What 37x12.50R20 means
- 37Overall diameter: 37.0" tall
- 12.50Section width: 12.50" wide
- RRadial construction
- 20Fits a 20-inch wheel
Want the full rundown on sidewall codes, load index, and speed rating? Read how to read a tire size.
37x12.50R20 compared to nearby 20-inch sizes
Speedometer column assumes your truck is calibrated for 37x12.50R20 and reads 65 mph.
| Size | Height | vs 37x12.50R20 | Width change | Actual speed | Compare |
|---|---|---|---|---|---|
| 305/55R20 | 33.2" | -3.8" (-10.2%) | -0.5" | 58.3 mph | Full comparison |
| 295/60R20 | 33.9" | -3.1" (-8.3%) | -0.9" | 59.6 mph | Full comparison |
| 275/65R20 | 34.1" | -2.9" (-7.9%) | -1.7" | 59.9 mph | Full comparison |
| 35x12.50R20 | 35.0" | -2.0" (-5.4%) | 0.0" | 61.5 mph | Full comparison |
| 37x13.50R20 | 37.0" | 0.0" (0.0%) | +1.0" | 65.0 mph | Full comparison |
Tires in stock in 37x12.50R20
24 models, 25 SKUs at NTW (different load ranges and sidewall styles). Refreshed daily.
| Tire | Type | Options | From |
|---|---|---|---|
| Interco SSR | Mud Terrain | 2 | $583 |
| AMP Off-Road AT Terrain Attack | All Terrain | 1 | $369 |
| Avix Off-Road TRAILTEK R/T | All Terrain, Mud Terrain, On/Off-Road | 1 | $384 |
| Bfgoodrich All-Terrain T/A KO3 | All Terrain | 1 | $539 |
| BFGoodrich HD All Terrain KT | All Terrain | 1 | $600 |
| Bfgoodrich Mud-Terrain T/A KM3 | Mud Terrain | 1 | $575 |
| Falken Wildpeak R/T01 | All Terrain | 1 | $593 |
| Hercules TIS TT1 | Mud Terrain | 1 | $293 |
| Ironman MTX | All Terrain | 1 | $315 |
| Kenda Klever RT | All Terrain | 1 | $528 |
| Mickey Thompson Baja Boss | Mud Terrain | 1 | $585 |
| Mickey Thompson Baja Boss AT | All Terrain | 1 | $546 |
| Mickey Thompson Baja Legend EXP | All Terrain | 1 | $497 |
| Mickey Thompson Baja Legend MTZ | Mud Terrain | 1 | $532 |
| Milestar Patagonia MT | Mud Terrain | 1 | $386 |
| Nitto Recon Grappler A/T | All Terrain | 1 | $526 |
| Nitto Ridge Grappler | All Terrain | 1 | $542 |
| Nitto Terra Grappler G3 | All Terrain | 1 | $508 |
| Nitto Trail Grappler M/T | Mud Terrain | 1 | $583 |
| Radar Renegade R7 M/T | Mud Terrain | 1 | $415 |
| Toyo Open Country A/T III | All Terrain | 1 | $494 |
| Toyo Open Country M/T | Mud Terrain | 1 | $604 |
| Toyo Open Country R/T | All Terrain | 1 | $560 |
| Toyo Open Country R/T Pro | All Terrain | 1 | $602 |
Prices per tire at NTW when last checked; confirm at checkout.
Frequently Asked Questions
How tall is a 37x12.50R20 tire in inches?+
A 37x12.50R20 is 37.00 inches tall and 12.50 inches wide, with a 8.50-inch sidewall on a 20-inch wheel. Real mounted tires vary a few tenths of an inch by brand, load range, and rim width.
What is 37x12.50R20 in metric?+
The nearest metric equivalent is 318/68R20. Flotation sizes like 37x12.50R20 list the actual height and width in inches, so there's no math to do: 37" tall, 12.50" wide.
What does 37x12.50R20 mean?+
37x12.50R20 is flotation sizing, which just tells you the dimensions in inches: 37" tall, 12.50" wide, on a 20-inch wheel.
Looking for another size? See the full truck tire size chart.