Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/80-18 | 120/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.82 (681.2) | 25.56 (649.2) | -1.26 (-32) -4.7% |
| Width inches (mm) | 5.51 (140) | 4.72 (120) | -0.79 (-20) -14.3% |
| Circum. inches (mm) | 84.25 (2140.05) | 80.3 (2039.52) | -3.96 (-100.53) -4.7% |
| Sidewall Height inches (mm) | 4.41 (112) | 3.78 (96) | -0.63 (-16) -14.3% |
| Revolutions per mile (km) | 752.01 (467.28) | 789.08 (490.31) | 37.07 (23.03) 4.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.06 mph (30.67 km/h) |
| 25 mph (40.23 km/h) | 23.83 mph (38.34 km/h) |
| 30 mph (48.28 km/h) | 28.59 mph (46.01 km/h) |
| 35 mph (56.33 km/h) | 33.36 mph (53.68 km/h) |
| 40 mph (64.37 km/h) | 38.12 mph (61.35 km/h) |
| 45 mph (72.42 km/h) | 42.89 mph (69.02 km/h) |
| 50 mph (80.47 km/h) | 47.65 mph (76.69 km/h) |
| 55 mph (88.51 km/h) | 52.42 mph (84.36 km/h) |
| 60 mph (96.56 km/h) | 57.18 mph (92.02 km/h) |
| 65 mph (104.61 km/h) | 61.95 mph (99.69 km/h) |
| 70 mph (112.65 km/h) | 66.71 mph (107.36 km/h) |
| 75 mph (120.7 km/h) | 71.48 mph (115.03 km/h) |
| 80 mph (128.75 km/h) | 76.24 mph (122.7 km/h) |
| 85 mph (136.79 km/h) | 81.01 mph (130.37 km/h) |
| 90 mph (144.84 km/h) | 85.77 mph (138.04 km/h) |
| 95 mph (152.89 km/h) | 90.54 mph (145.71 km/h) |
| 100 mph (160.93 km/h) | 95.3 mph (153.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2008 | 2333 | 2512 | 2623 | 2743 | 2828 | 2922 | 3033 | 3187 | 3341 | 3512 | 3649 | 3896 | 4170 | 4384 | 4520 | 4597 | 4879 | 5272 | 6127 |
Better Fuel Economy Factory Ratios Increased Power
