Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/70-17 | 120/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.72 (627.8) | 25.56 (649.2) | 0.84 (21.4) 3.4% |
| Width inches (mm) | 5.51 (140) | 4.72 (120) | -0.79 (-20) -14.3% |
| Circum. inches (mm) | 77.65 (1972.29) | 80.3 (2039.52) | 2.65 (67.23) 3.4% |
| Sidewall Height inches (mm) | 3.86 (98) | 3.78 (96) | -0.08 (-2) -2% |
| Revolutions per mile (km) | 815.98 (507.02) | 789.08 (490.31) | -26.9 (-16.71) -3.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.68 mph (33.28 km/h) |
| 25 mph (40.23 km/h) | 25.85 mph (41.61 km/h) |
| 30 mph (48.28 km/h) | 31.02 mph (49.93 km/h) |
| 35 mph (56.33 km/h) | 36.19 mph (58.25 km/h) |
| 40 mph (64.37 km/h) | 41.36 mph (66.57 km/h) |
| 45 mph (72.42 km/h) | 46.53 mph (74.89 km/h) |
| 50 mph (80.47 km/h) | 51.7 mph (83.21 km/h) |
| 55 mph (88.51 km/h) | 56.87 mph (91.53 km/h) |
| 60 mph (96.56 km/h) | 62.05 mph (99.85 km/h) |
| 65 mph (104.61 km/h) | 67.22 mph (108.17 km/h) |
| 70 mph (112.65 km/h) | 72.39 mph (116.49 km/h) |
| 75 mph (120.7 km/h) | 77.56 mph (124.82 km/h) |
| 80 mph (128.75 km/h) | 82.73 mph (133.14 km/h) |
| 85 mph (136.79 km/h) | 87.9 mph (141.46 km/h) |
| 90 mph (144.84 km/h) | 93.07 mph (149.78 km/h) |
| 95 mph (152.89 km/h) | 98.24 mph (158.1 km/h) |
| 100 mph (160.93 km/h) | 103.41 mph (166.42 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
