Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 145/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 27.13 (689.2) | 1.14 (29) 4.4% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 81.66 (2074.08) | 85.24 (2165.19) | 3.59 (91.11) 4.4% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.57 (116) | 0.57 (14.5) 14.3% |
| Revolutions per mile (km) | 775.93 (482.14) | 743.28 (461.85) | -32.65 (-20.29) -4.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.88 mph (33.6 km/h) |
| 25 mph (40.23 km/h) | 26.1 mph (42 km/h) |
| 30 mph (48.28 km/h) | 31.32 mph (50.4 km/h) |
| 35 mph (56.33 km/h) | 36.54 mph (58.8 km/h) |
| 40 mph (64.37 km/h) | 41.76 mph (67.2 km/h) |
| 45 mph (72.42 km/h) | 46.98 mph (75.6 km/h) |
| 50 mph (80.47 km/h) | 52.2 mph (84 km/h) |
| 55 mph (88.51 km/h) | 57.42 mph (92.4 km/h) |
| 60 mph (96.56 km/h) | 62.64 mph (100.8 km/h) |
| 65 mph (104.61 km/h) | 67.86 mph (109.2 km/h) |
| 70 mph (112.65 km/h) | 73.07 mph (117.6 km/h) |
| 75 mph (120.7 km/h) | 78.29 mph (126 km/h) |
| 80 mph (128.75 km/h) | 83.51 mph (134.4 km/h) |
| 85 mph (136.79 km/h) | 88.73 mph (142.8 km/h) |
| 90 mph (144.84 km/h) | 93.95 mph (151.2 km/h) |
| 95 mph (152.89 km/h) | 99.17 mph (159.6 km/h) |
| 100 mph (160.93 km/h) | 104.39 mph (168 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1892 | 2197 | 2366 | 2471 | 2584 | 2664 | 2753 | 2857 | 3002 | 3147 | 3308 | 3437 | 3670 | 3928 | 4129 | 4258 | 4330 | 4596 | 4966 | 5771 |
Better Fuel Economy Factory Ratios Increased Power
