Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 225/80-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 31.67 (804.5) | 5.64 (143.3) 21.7% |
| Width inches (mm) | 4.72 (120) | 8.86 (225) | 4.13 (105) 87.5% |
| Circum. inches (mm) | 81.78 (2077.22) | 99.5 (2527.41) | 17.72 (450.19) 21.7% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.09 (180) | 3.07 (78) 76.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 636.76 (395.66) | -138 (-85.75) -17.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.33 mph (39.16 km/h) |
| 25 mph (40.23 km/h) | 30.42 mph (48.95 km/h) |
| 30 mph (48.28 km/h) | 36.5 mph (58.74 km/h) |
| 35 mph (56.33 km/h) | 42.59 mph (68.53 km/h) |
| 40 mph (64.37 km/h) | 48.67 mph (78.33 km/h) |
| 45 mph (72.42 km/h) | 54.75 mph (88.12 km/h) |
| 50 mph (80.47 km/h) | 60.84 mph (97.91 km/h) |
| 55 mph (88.51 km/h) | 66.92 mph (107.7 km/h) |
| 60 mph (96.56 km/h) | 73 mph (117.49 km/h) |
| 65 mph (104.61 km/h) | 79.09 mph (127.28 km/h) |
| 70 mph (112.65 km/h) | 85.17 mph (137.07 km/h) |
| 75 mph (120.7 km/h) | 91.25 mph (146.86 km/h) |
| 80 mph (128.75 km/h) | 97.34 mph (156.65 km/h) |
| 85 mph (136.79 km/h) | 103.42 mph (166.44 km/h) |
| 90 mph (144.84 km/h) | 109.51 mph (176.23 km/h) |
| 95 mph (152.89 km/h) | 115.59 mph (186.02 km/h) |
| 100 mph (160.93 km/h) | 121.67 mph (195.81 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1620 | 1882 | 2027 | 2117 | 2213 | 2282 | 2358 | 2448 | 2572 | 2696 | 2834 | 2944 | 3144 | 3365 | 3537 | 3648 | 3710 | 3937 | 4254 | 4944 |
Better Fuel Economy Factory Ratios Increased Power
