Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 225/90-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 33.44 (849.5) | 7.41 (188.3) 28.5% |
| Width inches (mm) | 4.72 (120) | 8.86 (225) | 4.13 (105) 87.5% |
| Circum. inches (mm) | 81.78 (2077.22) | 105.07 (2668.78) | 23.29 (591.56) 28.5% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.97 (202.5) | 3.96 (100.5) 98.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 603.03 (374.7) | -171.73 (-106.71) -22.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.7 mph (41.35 km/h) |
| 25 mph (40.23 km/h) | 32.12 mph (51.69 km/h) |
| 30 mph (48.28 km/h) | 38.54 mph (62.03 km/h) |
| 35 mph (56.33 km/h) | 44.97 mph (72.37 km/h) |
| 40 mph (64.37 km/h) | 51.39 mph (82.71 km/h) |
| 45 mph (72.42 km/h) | 57.82 mph (93.04 km/h) |
| 50 mph (80.47 km/h) | 64.24 mph (103.38 km/h) |
| 55 mph (88.51 km/h) | 70.66 mph (113.72 km/h) |
| 60 mph (96.56 km/h) | 77.09 mph (124.06 km/h) |
| 65 mph (104.61 km/h) | 83.51 mph (134.4 km/h) |
| 70 mph (112.65 km/h) | 89.93 mph (144.74 km/h) |
| 75 mph (120.7 km/h) | 96.36 mph (155.07 km/h) |
| 80 mph (128.75 km/h) | 102.78 mph (165.41 km/h) |
| 85 mph (136.79 km/h) | 109.21 mph (175.75 km/h) |
| 90 mph (144.84 km/h) | 115.63 mph (186.09 km/h) |
| 95 mph (152.89 km/h) | 122.05 mph (196.43 km/h) |
| 100 mph (160.93 km/h) | 128.48 mph (206.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1535 | 1783 | 1920 | 2005 | 2096 | 2161 | 2233 | 2318 | 2436 | 2553 | 2684 | 2788 | 2978 | 3187 | 3350 | 3454 | 3513 | 3729 | 4029 | 4682 |
Better Fuel Economy Factory Ratios Increased Power
