Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 220/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 31.86 (809.2) | 5.83 (148) 22.4% |
| Width inches (mm) | 4.72 (120) | 8.66 (220) | 3.94 (100) 83.3% |
| Circum. inches (mm) | 81.78 (2077.22) | 100.09 (2542.18) | 18.31 (464.96) 22.4% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.93 (176) | 2.91 (74) 72.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 633.06 (393.36) | -141.7 (-88.05) -18.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.48 mph (39.39 km/h) |
| 25 mph (40.23 km/h) | 30.6 mph (49.24 km/h) |
| 30 mph (48.28 km/h) | 36.72 mph (59.09 km/h) |
| 35 mph (56.33 km/h) | 42.83 mph (68.94 km/h) |
| 40 mph (64.37 km/h) | 48.95 mph (78.78 km/h) |
| 45 mph (72.42 km/h) | 55.07 mph (88.63 km/h) |
| 50 mph (80.47 km/h) | 61.19 mph (98.48 km/h) |
| 55 mph (88.51 km/h) | 67.31 mph (108.33 km/h) |
| 60 mph (96.56 km/h) | 73.43 mph (118.17 km/h) |
| 65 mph (104.61 km/h) | 79.55 mph (128.02 km/h) |
| 70 mph (112.65 km/h) | 85.67 mph (137.87 km/h) |
| 75 mph (120.7 km/h) | 91.79 mph (147.72 km/h) |
| 80 mph (128.75 km/h) | 97.91 mph (157.57 km/h) |
| 85 mph (136.79 km/h) | 104.03 mph (167.41 km/h) |
| 90 mph (144.84 km/h) | 110.15 mph (177.26 km/h) |
| 95 mph (152.89 km/h) | 116.26 mph (187.11 km/h) |
| 100 mph (160.93 km/h) | 122.38 mph (196.96 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1611 | 1872 | 2015 | 2105 | 2201 | 2269 | 2345 | 2434 | 2557 | 2680 | 2818 | 2927 | 3126 | 3345 | 3517 | 3626 | 3688 | 3914 | 4230 | 4915 |
Better Fuel Economy Factory Ratios Increased Power
