Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-18 | 145/80-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 26.13 (663.8) | 0.1 (2.6) 0.4% |
| Width inches (mm) | 10.04 (255) | 5.71 (145) | -4.33 (-110) -43.1% |
| Circum. inches (mm) | 81.78 (2077.22) | 82.1 (2085.39) | 0.32 (8.17) 0.4% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.57 (116) | 0.55 (14) 13.7% |
| Revolutions per mile (km) | 774.76 (481.41) | 771.72 (479.53) | -3.03 (-1.89) -0.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.08 mph (32.31 km/h) |
| 25 mph (40.23 km/h) | 25.1 mph (40.39 km/h) |
| 30 mph (48.28 km/h) | 30.12 mph (48.47 km/h) |
| 35 mph (56.33 km/h) | 35.14 mph (56.55 km/h) |
| 40 mph (64.37 km/h) | 40.16 mph (64.63 km/h) |
| 45 mph (72.42 km/h) | 45.18 mph (72.71 km/h) |
| 50 mph (80.47 km/h) | 50.2 mph (80.78 km/h) |
| 55 mph (88.51 km/h) | 55.22 mph (88.86 km/h) |
| 60 mph (96.56 km/h) | 60.24 mph (96.94 km/h) |
| 65 mph (104.61 km/h) | 65.26 mph (105.02 km/h) |
| 70 mph (112.65 km/h) | 70.28 mph (113.1 km/h) |
| 75 mph (120.7 km/h) | 75.29 mph (121.18 km/h) |
| 80 mph (128.75 km/h) | 80.31 mph (129.25 km/h) |
| 85 mph (136.79 km/h) | 85.33 mph (137.33 km/h) |
| 90 mph (144.84 km/h) | 90.35 mph (145.41 km/h) |
| 95 mph (152.89 km/h) | 95.37 mph (153.49 km/h) |
| 100 mph (160.93 km/h) | 100.39 mph (161.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1964 | 2281 | 2457 | 2566 | 2683 | 2766 | 2858 | 2967 | 3117 | 3268 | 3435 | 3568 | 3811 | 4078 | 4287 | 4421 | 4496 | 4772 | 5156 | 5992 |
Better Fuel Economy Factory Ratios Increased Power
