Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 445/65-22.5 | 37/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 45.28 (1150) | 37.03 (940.48) | -8.25 (-209.52) -18.2% |
| Width inches (mm) | 17.52 (445) | 12.52 (318) | -5 (-127) -28.5% |
| Circum. inches (mm) | 142.24 (3612.83) | 116.32 (2954.61) | -25.91 (-658.23) -18.2% |
| Sidewall Height inches (mm) | 11.39 (289.25) | 8.51 (216.24) | -2.87 (-73.01) -25.2% |
| Revolutions per mile (km) | 445.45 (276.79) | 544.69 (338.45) | 99.24 (61.66) 22.3% |
37/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.36 mph (26.32 km/h) |
| 25 mph (40.23 km/h) | 20.45 mph (32.9 km/h) |
| 30 mph (48.28 km/h) | 24.53 mph (39.48 km/h) |
| 35 mph (56.33 km/h) | 28.62 mph (46.06 km/h) |
| 40 mph (64.37 km/h) | 32.71 mph (52.65 km/h) |
| 45 mph (72.42 km/h) | 36.8 mph (59.23 km/h) |
| 50 mph (80.47 km/h) | 40.89 mph (65.81 km/h) |
| 55 mph (88.51 km/h) | 44.98 mph (72.39 km/h) |
| 60 mph (96.56 km/h) | 49.07 mph (78.97 km/h) |
| 65 mph (104.61 km/h) | 53.16 mph (85.55 km/h) |
| 70 mph (112.65 km/h) | 57.25 mph (92.13 km/h) |
| 75 mph (120.7 km/h) | 61.34 mph (98.71 km/h) |
| 80 mph (128.75 km/h) | 65.42 mph (105.29 km/h) |
| 85 mph (136.79 km/h) | 69.51 mph (111.87 km/h) |
| 90 mph (144.84 km/h) | 73.6 mph (118.45 km/h) |
| 95 mph (152.89 km/h) | 77.69 mph (125.03 km/h) |
| 100 mph (160.93 km/h) | 81.78 mph (131.61 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1386 | 1610 | 1734 | 1811 | 1893 | 1952 | 2017 | 2094 | 2200 | 2306 | 2424 | 2519 | 2690 | 2878 | 3026 | 3120 | 3173 | 3368 | 3639 | 4229 |
Better Fuel Economy Factory Ratios Increased Power
