Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/11.5-20 | 305/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.01 (940.16) | 36.81 (935) | -0.2 (-5.16) -0.5% |
| Width inches (mm) | 11.5 (292) | 12.01 (305) | 0.51 (13) 4.5% |
| Circum. inches (mm) | 116.28 (2953.6) | 115.65 (2937.39) | -0.64 (-16.21) -0.5% |
| Sidewall Height inches (mm) | 8.51 (216.08) | 8.41 (213.5) | -0.1 (-2.58) -1.2% |
| Revolutions per mile (km) | 544.88 (338.57) | 547.88 (340.44) | 3.01 (1.87) 0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.89 mph (32.01 km/h) |
| 25 mph (40.23 km/h) | 24.86 mph (40.01 km/h) |
| 30 mph (48.28 km/h) | 29.84 mph (48.02 km/h) |
| 35 mph (56.33 km/h) | 34.81 mph (56.02 km/h) |
| 40 mph (64.37 km/h) | 39.78 mph (64.02 km/h) |
| 45 mph (72.42 km/h) | 44.75 mph (72.02 km/h) |
| 50 mph (80.47 km/h) | 49.73 mph (80.03 km/h) |
| 55 mph (88.51 km/h) | 54.7 mph (88.03 km/h) |
| 60 mph (96.56 km/h) | 59.67 mph (96.03 km/h) |
| 65 mph (104.61 km/h) | 64.64 mph (104.03 km/h) |
| 70 mph (112.65 km/h) | 69.62 mph (112.04 km/h) |
| 75 mph (120.7 km/h) | 74.59 mph (120.04 km/h) |
| 80 mph (128.75 km/h) | 79.56 mph (128.04 km/h) |
| 85 mph (136.79 km/h) | 84.53 mph (136.04 km/h) |
| 90 mph (144.84 km/h) | 89.51 mph (144.05 km/h) |
| 95 mph (152.89 km/h) | 94.48 mph (152.05 km/h) |
| 100 mph (160.93 km/h) | 99.45 mph (160.05 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1394 | 1620 | 1744 | 1821 | 1904 | 1964 | 2029 | 2106 | 2213 | 2320 | 2438 | 2533 | 2705 | 2895 | 3044 | 3139 | 3192 | 3388 | 3661 | 4254 |
Better Fuel Economy Factory Ratios Increased Power
