Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 145/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 27.13 (689.2) | -3.27 (-83) -10.7% |
| Width inches (mm) | 6.89 (175) | 5.71 (145) | -1.18 (-30) -17.1% |
| Circum. inches (mm) | 95.51 (2425.94) | 85.24 (2165.19) | -10.27 (-260.75) -10.7% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 4.57 (116) | -1.63 (-41.5) -26.3% |
| Revolutions per mile (km) | 663.39 (412.21) | 743.28 (461.85) | 79.89 (49.64) 12% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.85 mph (28.73 km/h) |
| 25 mph (40.23 km/h) | 22.31 mph (35.91 km/h) |
| 30 mph (48.28 km/h) | 26.78 mph (43.09 km/h) |
| 35 mph (56.33 km/h) | 31.24 mph (50.27 km/h) |
| 40 mph (64.37 km/h) | 35.7 mph (57.45 km/h) |
| 45 mph (72.42 km/h) | 40.16 mph (64.64 km/h) |
| 50 mph (80.47 km/h) | 44.63 mph (71.82 km/h) |
| 55 mph (88.51 km/h) | 49.09 mph (79 km/h) |
| 60 mph (96.56 km/h) | 53.55 mph (86.18 km/h) |
| 65 mph (104.61 km/h) | 58.01 mph (93.36 km/h) |
| 70 mph (112.65 km/h) | 62.48 mph (100.55 km/h) |
| 75 mph (120.7 km/h) | 66.94 mph (107.73 km/h) |
| 80 mph (128.75 km/h) | 71.4 mph (114.91 km/h) |
| 85 mph (136.79 km/h) | 75.86 mph (122.09 km/h) |
| 90 mph (144.84 km/h) | 80.33 mph (129.27 km/h) |
| 95 mph (152.89 km/h) | 84.79 mph (136.45 km/h) |
| 100 mph (160.93 km/h) | 89.25 mph (143.64 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
