Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 245/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 34.4 (873.7) | 8.37 (212.5) 32.1% |
| Width inches (mm) | 4.72 (120) | 9.65 (245) | 4.92 (125) 104.2% |
| Circum. inches (mm) | 81.78 (2077.22) | 108.06 (2744.81) | 26.28 (667.59) 32.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 8.2 (208.25) | 4.18 (106.25) 104.2% |
| Revolutions per mile (km) | 774.76 (481.41) | 586.32 (364.32) | -188.44 (-117.09) -24.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.43 mph (42.53 km/h) |
| 25 mph (40.23 km/h) | 33.03 mph (53.16 km/h) |
| 30 mph (48.28 km/h) | 39.64 mph (63.8 km/h) |
| 35 mph (56.33 km/h) | 46.25 mph (74.43 km/h) |
| 40 mph (64.37 km/h) | 52.86 mph (85.06 km/h) |
| 45 mph (72.42 km/h) | 59.46 mph (95.7 km/h) |
| 50 mph (80.47 km/h) | 66.07 mph (106.33 km/h) |
| 55 mph (88.51 km/h) | 72.68 mph (116.96 km/h) |
| 60 mph (96.56 km/h) | 79.28 mph (127.59 km/h) |
| 65 mph (104.61 km/h) | 85.89 mph (138.23 km/h) |
| 70 mph (112.65 km/h) | 92.5 mph (148.86 km/h) |
| 75 mph (120.7 km/h) | 99.1 mph (159.49 km/h) |
| 80 mph (128.75 km/h) | 105.71 mph (170.13 km/h) |
| 85 mph (136.79 km/h) | 112.32 mph (180.76 km/h) |
| 90 mph (144.84 km/h) | 118.92 mph (191.39 km/h) |
| 95 mph (152.89 km/h) | 125.53 mph (202.02 km/h) |
| 100 mph (160.93 km/h) | 132.14 mph (212.66 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1492 | 1733 | 1867 | 1949 | 2038 | 2102 | 2171 | 2254 | 2368 | 2483 | 2610 | 2711 | 2895 | 3098 | 3257 | 3359 | 3416 | 3625 | 3918 | 4552 |
Better Fuel Economy Factory Ratios Increased Power
