Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 290/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 37.41 (950.2) | 11.71 (297.5) 45.6% |
| Width inches (mm) | 4.53 (115) | 11.42 (290) | 6.89 (175) 152.2% |
| Circum. inches (mm) | 80.73 (2050.52) | 117.53 (2985.14) | 36.8 (934.62) 45.6% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 9.7 (246.5) | 5.86 (148.75) 152.2% |
| Revolutions per mile (km) | 784.85 (487.68) | 539.12 (334.99) | -245.73 (-152.69) -31.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 29.12 mph (46.86 km/h) |
| 25 mph (40.23 km/h) | 36.39 mph (58.57 km/h) |
| 30 mph (48.28 km/h) | 43.67 mph (70.29 km/h) |
| 35 mph (56.33 km/h) | 50.95 mph (82 km/h) |
| 40 mph (64.37 km/h) | 58.23 mph (93.72 km/h) |
| 45 mph (72.42 km/h) | 65.51 mph (105.43 km/h) |
| 50 mph (80.47 km/h) | 72.79 mph (117.14 km/h) |
| 55 mph (88.51 km/h) | 80.07 mph (128.86 km/h) |
| 60 mph (96.56 km/h) | 87.35 mph (140.57 km/h) |
| 65 mph (104.61 km/h) | 94.63 mph (152.29 km/h) |
| 70 mph (112.65 km/h) | 101.91 mph (164 km/h) |
| 75 mph (120.7 km/h) | 109.18 mph (175.72 km/h) |
| 80 mph (128.75 km/h) | 116.46 mph (187.43 km/h) |
| 85 mph (136.79 km/h) | 123.74 mph (199.15 km/h) |
| 90 mph (144.84 km/h) | 131.02 mph (210.86 km/h) |
| 95 mph (152.89 km/h) | 138.3 mph (222.57 km/h) |
| 100 mph (160.93 km/h) | 145.58 mph (234.29 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
