Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/80-18 | 100/84.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.56 (649.2) | 24.69 (627.2) | -0.87 (-22) -3.4% |
| Width inches (mm) | 4.72 (120) | 3.94 (100) | -0.79 (-20) -16.7% |
| Circum. inches (mm) | 80.3 (2039.52) | 77.58 (1970.41) | -2.72 (-69.12) -3.4% |
| Sidewall Height inches (mm) | 3.78 (96) | 3.35 (85) | -0.43 (-11) -11.5% |
| Revolutions per mile (km) | 789.08 (490.31) | 816.76 (507.51) | 27.68 (17.2) 3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.32 mph (31.1 km/h) |
| 25 mph (40.23 km/h) | 24.15 mph (38.87 km/h) |
| 30 mph (48.28 km/h) | 28.98 mph (46.64 km/h) |
| 35 mph (56.33 km/h) | 33.81 mph (54.42 km/h) |
| 40 mph (64.37 km/h) | 38.64 mph (62.19 km/h) |
| 45 mph (72.42 km/h) | 43.48 mph (69.97 km/h) |
| 50 mph (80.47 km/h) | 48.31 mph (77.74 km/h) |
| 55 mph (88.51 km/h) | 53.14 mph (85.51 km/h) |
| 60 mph (96.56 km/h) | 57.97 mph (93.29 km/h) |
| 65 mph (104.61 km/h) | 62.8 mph (101.06 km/h) |
| 70 mph (112.65 km/h) | 67.63 mph (108.84 km/h) |
| 75 mph (120.7 km/h) | 72.46 mph (116.61 km/h) |
| 80 mph (128.75 km/h) | 77.29 mph (124.38 km/h) |
| 85 mph (136.79 km/h) | 82.12 mph (132.16 km/h) |
| 90 mph (144.84 km/h) | 86.95 mph (139.93 km/h) |
| 95 mph (152.89 km/h) | 91.78 mph (147.71 km/h) |
| 100 mph (160.93 km/h) | 96.61 mph (155.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2078 | 2415 | 2600 | 2715 | 2839 | 2928 | 3025 | 3140 | 3299 | 3458 | 3635 | 3777 | 4033 | 4316 | 4537 | 4679 | 4758 | 5050 | 5457 | 6342 |
Better Fuel Economy Factory Ratios Increased Power
