Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/80-18 | 100/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 24.3 (617.2) | -1.26 (-32) -4.9% |
| Width inches (mm) | 4.72 (120) | 3.94 (100) | -0.79 (-20) -16.7% |
| Circum. inches (mm) | 80.3 (2039.52) | 76.34 (1938.99) | -3.96 (-100.53) -4.9% |
| Sidewall Height inches (mm) | 3.78 (96) | 3.15 (80) | -0.63 (-16) -16.7% |
| Revolutions per mile (km) | 789.08 (490.31) | 829.99 (515.73) | 40.91 (25.42) 5.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.01 mph (30.6 km/h) |
| 25 mph (40.23 km/h) | 23.77 mph (38.25 km/h) |
| 30 mph (48.28 km/h) | 28.52 mph (45.9 km/h) |
| 35 mph (56.33 km/h) | 33.27 mph (53.55 km/h) |
| 40 mph (64.37 km/h) | 38.03 mph (61.2 km/h) |
| 45 mph (72.42 km/h) | 42.78 mph (68.85 km/h) |
| 50 mph (80.47 km/h) | 47.54 mph (76.5 km/h) |
| 55 mph (88.51 km/h) | 52.29 mph (84.15 km/h) |
| 60 mph (96.56 km/h) | 57.04 mph (91.8 km/h) |
| 65 mph (104.61 km/h) | 61.8 mph (99.45 km/h) |
| 70 mph (112.65 km/h) | 66.55 mph (107.1 km/h) |
| 75 mph (120.7 km/h) | 71.3 mph (114.75 km/h) |
| 80 mph (128.75 km/h) | 76.06 mph (122.4 km/h) |
| 85 mph (136.79 km/h) | 80.81 mph (130.05 km/h) |
| 90 mph (144.84 km/h) | 85.56 mph (137.7 km/h) |
| 95 mph (152.89 km/h) | 90.32 mph (145.35 km/h) |
| 100 mph (160.93 km/h) | 95.07 mph (153 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2112 | 2454 | 2642 | 2759 | 2885 | 2975 | 3074 | 3191 | 3353 | 3514 | 3694 | 3838 | 4099 | 4386 | 4611 | 4755 | 4836 | 5132 | 5546 | 6444 |
Better Fuel Economy Factory Ratios Increased Power
