Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 325/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 37.91 (963) | -2.12 (-53.8) -5.3% |
| Width inches (mm) | 12.52 (318) | 12.8 (325) | 0.28 (7) 2.2% |
| Circum. inches (mm) | 125.76 (3194.37) | 119.11 (3025.35) | -6.65 (-169.02) -5.3% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 8.96 (227.5) | -1.06 (-26.9) -10.6% |
| Revolutions per mile (km) | 503.81 (313.05) | 531.95 (330.54) | 28.15 (17.49) 5.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.94 mph (30.48 km/h) |
| 25 mph (40.23 km/h) | 23.68 mph (38.1 km/h) |
| 30 mph (48.28 km/h) | 28.41 mph (45.73 km/h) |
| 35 mph (56.33 km/h) | 33.15 mph (53.35 km/h) |
| 40 mph (64.37 km/h) | 37.88 mph (60.97 km/h) |
| 45 mph (72.42 km/h) | 42.62 mph (68.59 km/h) |
| 50 mph (80.47 km/h) | 47.35 mph (76.21 km/h) |
| 55 mph (88.51 km/h) | 52.09 mph (83.83 km/h) |
| 60 mph (96.56 km/h) | 56.83 mph (91.45 km/h) |
| 65 mph (104.61 km/h) | 61.56 mph (99.07 km/h) |
| 70 mph (112.65 km/h) | 66.3 mph (106.69 km/h) |
| 75 mph (120.7 km/h) | 71.03 mph (114.31 km/h) |
| 80 mph (128.75 km/h) | 75.77 mph (121.94 km/h) |
| 85 mph (136.79 km/h) | 80.5 mph (129.56 km/h) |
| 90 mph (144.84 km/h) | 85.24 mph (137.18 km/h) |
| 95 mph (152.89 km/h) | 89.97 mph (144.8 km/h) |
| 100 mph (160.93 km/h) | 94.71 mph (152.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1354 | 1573 | 1694 | 1768 | 1849 | 1907 | 1970 | 2045 | 2149 | 2252 | 2368 | 2460 | 2627 | 2811 | 2955 | 3047 | 3099 | 3289 | 3554 | 4130 |
Better Fuel Economy Factory Ratios Increased Power
