Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 80/90-21 | 120/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.67 (677.4) | 25.56 (649.2) | -1.11 (-28.2) -4.2% |
| Width inches (mm) | 3.15 (80) | 4.72 (120) | 1.57 (40) 50% |
| Circum. inches (mm) | 83.78 (2128.11) | 80.3 (2039.52) | -3.49 (-88.59) -4.2% |
| Sidewall Height inches (mm) | 2.83 (72) | 3.78 (96) | 0.94 (24) 33.3% |
| Revolutions per mile (km) | 756.23 (469.9) | 789.08 (490.31) | 32.85 (20.41) 4.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.17 mph (30.85 km/h) |
| 25 mph (40.23 km/h) | 23.96 mph (38.56 km/h) |
| 30 mph (48.28 km/h) | 28.75 mph (46.27 km/h) |
| 35 mph (56.33 km/h) | 33.54 mph (53.98 km/h) |
| 40 mph (64.37 km/h) | 38.33 mph (61.69 km/h) |
| 45 mph (72.42 km/h) | 43.13 mph (69.41 km/h) |
| 50 mph (80.47 km/h) | 47.92 mph (77.12 km/h) |
| 55 mph (88.51 km/h) | 52.71 mph (84.83 km/h) |
| 60 mph (96.56 km/h) | 57.5 mph (92.54 km/h) |
| 65 mph (104.61 km/h) | 62.29 mph (100.25 km/h) |
| 70 mph (112.65 km/h) | 67.09 mph (107.96 km/h) |
| 75 mph (120.7 km/h) | 71.88 mph (115.68 km/h) |
| 80 mph (128.75 km/h) | 76.67 mph (123.39 km/h) |
| 85 mph (136.79 km/h) | 81.46 mph (131.1 km/h) |
| 90 mph (144.84 km/h) | 86.25 mph (138.81 km/h) |
| 95 mph (152.89 km/h) | 91.05 mph (146.52 km/h) |
| 100 mph (160.93 km/h) | 95.84 mph (154.24 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
