Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 290/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 37.41 (950.2) | 7.01 (178) 23.1% |
| Width inches (mm) | 6.89 (175) | 11.42 (290) | 4.53 (115) 65.7% |
| Circum. inches (mm) | 95.51 (2425.94) | 117.53 (2985.14) | 22.02 (559.2) 23.1% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 9.7 (246.5) | 3.5 (89) 56.5% |
| Revolutions per mile (km) | 663.39 (412.21) | 539.12 (334.99) | -124.27 (-77.22) -18.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.61 mph (39.61 km/h) |
| 25 mph (40.23 km/h) | 30.76 mph (49.51 km/h) |
| 30 mph (48.28 km/h) | 36.92 mph (59.41 km/h) |
| 35 mph (56.33 km/h) | 43.07 mph (69.31 km/h) |
| 40 mph (64.37 km/h) | 49.22 mph (79.21 km/h) |
| 45 mph (72.42 km/h) | 55.37 mph (89.11 km/h) |
| 50 mph (80.47 km/h) | 61.53 mph (99.02 km/h) |
| 55 mph (88.51 km/h) | 67.68 mph (108.92 km/h) |
| 60 mph (96.56 km/h) | 73.83 mph (118.82 km/h) |
| 65 mph (104.61 km/h) | 79.98 mph (128.72 km/h) |
| 70 mph (112.65 km/h) | 86.14 mph (138.62 km/h) |
| 75 mph (120.7 km/h) | 92.29 mph (148.52 km/h) |
| 80 mph (128.75 km/h) | 98.44 mph (158.43 km/h) |
| 85 mph (136.79 km/h) | 104.59 mph (168.33 km/h) |
| 90 mph (144.84 km/h) | 110.75 mph (178.23 km/h) |
| 95 mph (152.89 km/h) | 116.9 mph (188.13 km/h) |
| 100 mph (160.93 km/h) | 123.05 mph (198.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1372 | 1594 | 1716 | 1792 | 1874 | 1932 | 1997 | 2073 | 2178 | 2283 | 2399 | 2493 | 2662 | 2849 | 2995 | 3088 | 3141 | 3334 | 3602 | 4186 |
Better Fuel Economy Factory Ratios Increased Power
