Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 37/10.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 37.03 (940.54) | 7.42 (188.54) 25.1% |
| Width inches (mm) | 12.01 (305) | 10.51 (267) | -1.5 (-38) -12.5% |
| Circum. inches (mm) | 93.01 (2362.48) | 116.33 (2954.79) | 23.32 (592.32) 25.1% |
| Sidewall Height inches (mm) | 4.8 (122) | 8.51 (216.27) | 3.71 (94.27) 77.3% |
| Revolutions per mile (km) | 681.21 (423.28) | 544.66 (338.43) | -136.55 (-84.85) -20% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.01 mph (40.26 km/h) |
| 25 mph (40.23 km/h) | 31.27 mph (50.32 km/h) |
| 30 mph (48.28 km/h) | 37.52 mph (60.39 km/h) |
| 35 mph (56.33 km/h) | 43.78 mph (70.45 km/h) |
| 40 mph (64.37 km/h) | 50.03 mph (80.51 km/h) |
| 45 mph (72.42 km/h) | 56.28 mph (90.58 km/h) |
| 50 mph (80.47 km/h) | 62.54 mph (100.64 km/h) |
| 55 mph (88.51 km/h) | 68.79 mph (110.71 km/h) |
| 60 mph (96.56 km/h) | 75.04 mph (120.77 km/h) |
| 65 mph (104.61 km/h) | 81.3 mph (130.83 km/h) |
| 70 mph (112.65 km/h) | 87.55 mph (140.9 km/h) |
| 75 mph (120.7 km/h) | 93.8 mph (150.96 km/h) |
| 80 mph (128.75 km/h) | 100.06 mph (161.03 km/h) |
| 85 mph (136.79 km/h) | 106.31 mph (171.09 km/h) |
| 90 mph (144.84 km/h) | 112.56 mph (181.16 km/h) |
| 95 mph (152.89 km/h) | 118.82 mph (191.22 km/h) |
| 100 mph (160.93 km/h) | 125.07 mph (201.28 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 | 2518 | 2690 | 2878 | 3026 | 3120 | 3173 | 3368 | 3639 | 4229 |
Better Fuel Economy Factory Ratios Increased Power
