Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/80-18 | 120/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.82 (681.2) | 26.5 (673.2) | -0.31 (-8) -1.2% |
| Width inches (mm) | 5.51 (140) | 4.72 (120) | -0.79 (-20) -14.3% |
| Circum. inches (mm) | 84.25 (2140.05) | 83.26 (2114.92) | -0.99 (-25.13) -1.2% |
| Sidewall Height inches (mm) | 4.41 (112) | 4.25 (108) | -0.16 (-4) -3.6% |
| Revolutions per mile (km) | 752.01 (467.28) | 760.95 (472.83) | 8.94 (5.55) 1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.77 mph (31.81 km/h) |
| 25 mph (40.23 km/h) | 24.71 mph (39.76 km/h) |
| 30 mph (48.28 km/h) | 29.65 mph (47.71 km/h) |
| 35 mph (56.33 km/h) | 34.59 mph (55.67 km/h) |
| 40 mph (64.37 km/h) | 39.53 mph (63.62 km/h) |
| 45 mph (72.42 km/h) | 44.47 mph (71.57 km/h) |
| 50 mph (80.47 km/h) | 49.41 mph (79.52 km/h) |
| 55 mph (88.51 km/h) | 54.35 mph (87.47 km/h) |
| 60 mph (96.56 km/h) | 59.3 mph (95.43 km/h) |
| 65 mph (104.61 km/h) | 64.24 mph (103.38 km/h) |
| 70 mph (112.65 km/h) | 69.18 mph (111.33 km/h) |
| 75 mph (120.7 km/h) | 74.12 mph (119.28 km/h) |
| 80 mph (128.75 km/h) | 79.06 mph (127.24 km/h) |
| 85 mph (136.79 km/h) | 84 mph (135.19 km/h) |
| 90 mph (144.84 km/h) | 88.94 mph (143.14 km/h) |
| 95 mph (152.89 km/h) | 93.88 mph (151.09 km/h) |
| 100 mph (160.93 km/h) | 98.83 mph (159.04 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
