Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/60-18 | 120/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.61 (625.2) | 26.5 (673.2) | 1.89 (48) 7.7% |
| Width inches (mm) | 5.51 (140) | 4.72 (120) | -0.79 (-20) -14.3% |
| Circum. inches (mm) | 77.33 (1964.12) | 83.26 (2114.92) | 5.94 (150.8) 7.7% |
| Sidewall Height inches (mm) | 3.31 (84) | 4.25 (108) | 0.94 (24) 28.6% |
| Revolutions per mile (km) | 819.37 (509.13) | 760.95 (472.83) | -58.42 (-36.3) -7.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.54 mph (34.66 km/h) |
| 25 mph (40.23 km/h) | 26.92 mph (43.32 km/h) |
| 30 mph (48.28 km/h) | 32.3 mph (51.99 km/h) |
| 35 mph (56.33 km/h) | 37.69 mph (60.65 km/h) |
| 40 mph (64.37 km/h) | 43.07 mph (69.32 km/h) |
| 45 mph (72.42 km/h) | 48.45 mph (77.98 km/h) |
| 50 mph (80.47 km/h) | 53.84 mph (86.65 km/h) |
| 55 mph (88.51 km/h) | 59.22 mph (95.31 km/h) |
| 60 mph (96.56 km/h) | 64.61 mph (103.97 km/h) |
| 65 mph (104.61 km/h) | 69.99 mph (112.64 km/h) |
| 70 mph (112.65 km/h) | 75.37 mph (121.3 km/h) |
| 75 mph (120.7 km/h) | 80.76 mph (129.97 km/h) |
| 80 mph (128.75 km/h) | 86.14 mph (138.63 km/h) |
| 85 mph (136.79 km/h) | 91.53 mph (147.3 km/h) |
| 90 mph (144.84 km/h) | 96.91 mph (155.96 km/h) |
| 95 mph (152.89 km/h) | 102.29 mph (164.63 km/h) |
| 100 mph (160.93 km/h) | 107.68 mph (173.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1936 | 2250 | 2423 | 2530 | 2645 | 2728 | 2818 | 2925 | 3074 | 3222 | 3387 | 3519 | 3758 | 4021 | 4227 | 4359 | 4433 | 4705 | 5084 | 5908 |
Better Fuel Economy Factory Ratios Increased Power
