Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 400/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 38.47 (977.2) | 10.55 (268) 37.8% |
| Width inches (mm) | 7.09 (180) | 15.75 (400) | 8.66 (220) 122.2% |
| Circum. inches (mm) | 87.72 (2228.02) | 120.86 (3069.96) | 33.15 (841.95) 37.8% |
| Sidewall Height inches (mm) | 4.96 (126) | 10.24 (260) | 5.28 (134) 106.3% |
| Revolutions per mile (km) | 722.32 (448.83) | 524.22 (325.74) | -198.1 (-123.09) -27.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.56 mph (44.35 km/h) |
| 25 mph (40.23 km/h) | 34.45 mph (55.44 km/h) |
| 30 mph (48.28 km/h) | 41.34 mph (66.53 km/h) |
| 35 mph (56.33 km/h) | 48.23 mph (77.61 km/h) |
| 40 mph (64.37 km/h) | 55.12 mph (88.7 km/h) |
| 45 mph (72.42 km/h) | 62.01 mph (99.79 km/h) |
| 50 mph (80.47 km/h) | 68.89 mph (110.88 km/h) |
| 55 mph (88.51 km/h) | 75.78 mph (121.96 km/h) |
| 60 mph (96.56 km/h) | 82.67 mph (133.05 km/h) |
| 65 mph (104.61 km/h) | 89.56 mph (144.14 km/h) |
| 70 mph (112.65 km/h) | 96.45 mph (155.23 km/h) |
| 75 mph (120.7 km/h) | 103.34 mph (166.31 km/h) |
| 80 mph (128.75 km/h) | 110.23 mph (177.4 km/h) |
| 85 mph (136.79 km/h) | 117.12 mph (188.49 km/h) |
| 90 mph (144.84 km/h) | 124.01 mph (199.58 km/h) |
| 95 mph (152.89 km/h) | 130.9 mph (210.66 km/h) |
| 100 mph (160.93 km/h) | 137.79 mph (221.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1334 | 1550 | 1669 | 1743 | 1822 | 1879 | 1941 | 2015 | 2117 | 2220 | 2333 | 2424 | 2589 | 2770 | 2912 | 3003 | 3054 | 3241 | 3503 | 4070 |
Better Fuel Economy Factory Ratios Increased Power
