Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 40/13.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 39.99 (1015.64) | -0.05 (-1.16) -0.1% |
| Width inches (mm) | 12.52 (318) | 13.5 (343) | 0.98 (25) 7.9% |
| Circum. inches (mm) | 125.76 (3194.37) | 125.62 (3190.73) | -0.14 (-3.64) -0.1% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 9.99 (253.82) | -0.02 (-0.58) -0.2% |
| Revolutions per mile (km) | 503.81 (313.05) | 504.38 (313.41) | 0.58 (0.36) 0.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.98 mph (32.15 km/h) |
| 25 mph (40.23 km/h) | 24.97 mph (40.19 km/h) |
| 30 mph (48.28 km/h) | 29.97 mph (48.23 km/h) |
| 35 mph (56.33 km/h) | 34.96 mph (56.26 km/h) |
| 40 mph (64.37 km/h) | 39.95 mph (64.3 km/h) |
| 45 mph (72.42 km/h) | 44.95 mph (72.34 km/h) |
| 50 mph (80.47 km/h) | 49.94 mph (80.38 km/h) |
| 55 mph (88.51 km/h) | 54.94 mph (88.41 km/h) |
| 60 mph (96.56 km/h) | 59.93 mph (96.45 km/h) |
| 65 mph (104.61 km/h) | 64.93 mph (104.49 km/h) |
| 70 mph (112.65 km/h) | 69.92 mph (112.53 km/h) |
| 75 mph (120.7 km/h) | 74.91 mph (120.56 km/h) |
| 80 mph (128.75 km/h) | 79.91 mph (128.6 km/h) |
| 85 mph (136.79 km/h) | 84.9 mph (136.64 km/h) |
| 90 mph (144.84 km/h) | 89.9 mph (144.68 km/h) |
| 95 mph (152.89 km/h) | 94.89 mph (152.71 km/h) |
| 100 mph (160.93 km/h) | 99.89 mph (160.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1284 | 1491 | 1606 | 1677 | 1753 | 1808 | 1868 | 1939 | 2037 | 2136 | 2245 | 2332 | 2491 | 2665 | 2802 | 2889 | 2939 | 3119 | 3370 | 3916 |
Better Fuel Economy Factory Ratios Increased Power
