Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/70-18 | 120/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.72 (653.2) | 26.5 (673.2) | 0.79 (20) 3.1% |
| Width inches (mm) | 5.51 (140) | 4.72 (120) | -0.79 (-20) -14.3% |
| Circum. inches (mm) | 80.79 (2052.09) | 83.26 (2114.92) | 2.47 (62.83) 3.1% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.25 (108) | 0.39 (10) 10.2% |
| Revolutions per mile (km) | 784.25 (487.31) | 760.95 (472.83) | -23.3 (-14.48) -3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.61 mph (33.17 km/h) |
| 25 mph (40.23 km/h) | 25.77 mph (41.47 km/h) |
| 30 mph (48.28 km/h) | 30.92 mph (49.76 km/h) |
| 35 mph (56.33 km/h) | 36.07 mph (58.05 km/h) |
| 40 mph (64.37 km/h) | 41.22 mph (66.34 km/h) |
| 45 mph (72.42 km/h) | 46.38 mph (74.64 km/h) |
| 50 mph (80.47 km/h) | 51.53 mph (82.93 km/h) |
| 55 mph (88.51 km/h) | 56.68 mph (91.22 km/h) |
| 60 mph (96.56 km/h) | 61.84 mph (99.52 km/h) |
| 65 mph (104.61 km/h) | 66.99 mph (107.81 km/h) |
| 70 mph (112.65 km/h) | 72.14 mph (116.1 km/h) |
| 75 mph (120.7 km/h) | 77.3 mph (124.4 km/h) |
| 80 mph (128.75 km/h) | 82.45 mph (132.69 km/h) |
| 85 mph (136.79 km/h) | 87.6 mph (140.98 km/h) |
| 90 mph (144.84 km/h) | 92.76 mph (149.28 km/h) |
| 95 mph (152.89 km/h) | 97.91 mph (157.57 km/h) |
| 100 mph (160.93 km/h) | 103.06 mph (165.86 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
