Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 315/80-22.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 42.34 (1075.5) | 2.31 (58.7) 5.8% |
| Width inches (mm) | 12.52 (318) | 12.4 (315) | -0.12 (-3) -0.9% |
| Circum. inches (mm) | 125.76 (3194.37) | 133.02 (3378.78) | 7.26 (184.41) 5.8% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 9.92 (252) | -0.09 (-2.4) -0.9% |
| Revolutions per mile (km) | 503.81 (313.05) | 476.31 (295.96) | -27.5 (-17.09) -5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.15 mph (34.05 km/h) |
| 25 mph (40.23 km/h) | 26.44 mph (42.56 km/h) |
| 30 mph (48.28 km/h) | 31.73 mph (51.07 km/h) |
| 35 mph (56.33 km/h) | 37.02 mph (59.58 km/h) |
| 40 mph (64.37 km/h) | 42.31 mph (68.09 km/h) |
| 45 mph (72.42 km/h) | 47.6 mph (76.6 km/h) |
| 50 mph (80.47 km/h) | 52.89 mph (85.11 km/h) |
| 55 mph (88.51 km/h) | 58.18 mph (93.62 km/h) |
| 60 mph (96.56 km/h) | 63.46 mph (102.14 km/h) |
| 65 mph (104.61 km/h) | 68.75 mph (110.65 km/h) |
| 70 mph (112.65 km/h) | 74.04 mph (119.16 km/h) |
| 75 mph (120.7 km/h) | 79.33 mph (127.67 km/h) |
| 80 mph (128.75 km/h) | 84.62 mph (136.18 km/h) |
| 85 mph (136.79 km/h) | 89.91 mph (144.69 km/h) |
| 90 mph (144.84 km/h) | 95.2 mph (153.2 km/h) |
| 95 mph (152.89 km/h) | 100.48 mph (161.71 km/h) |
| 100 mph (160.93 km/h) | 105.77 mph (170.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1212 | 1408 | 1516 | 1583 | 1656 | 1707 | 1764 | 1831 | 1924 | 2017 | 2120 | 2202 | 2352 | 2517 | 2646 | 2729 | 2775 | 2945 | 3182 | 3698 |
Better Fuel Economy Factory Ratios Increased Power
