Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 225/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 33.06 (839.7) | 7.03 (178.5) 27% |
| Width inches (mm) | 4.72 (120) | 8.86 (225) | 4.13 (105) 87.5% |
| Circum. inches (mm) | 81.78 (2077.22) | 103.86 (2638) | 22.08 (560.77) 27% |
| Sidewall Height inches (mm) | 4.02 (102) | 7.53 (191.25) | 3.51 (89.25) 87.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 610.06 (379.07) | -164.69 (-102.34) -21.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.4 mph (40.88 km/h) |
| 25 mph (40.23 km/h) | 31.75 mph (51.1 km/h) |
| 30 mph (48.28 km/h) | 38.1 mph (61.31 km/h) |
| 35 mph (56.33 km/h) | 44.45 mph (71.53 km/h) |
| 40 mph (64.37 km/h) | 50.8 mph (81.75 km/h) |
| 45 mph (72.42 km/h) | 57.15 mph (91.97 km/h) |
| 50 mph (80.47 km/h) | 63.5 mph (102.19 km/h) |
| 55 mph (88.51 km/h) | 69.85 mph (112.41 km/h) |
| 60 mph (96.56 km/h) | 76.2 mph (122.63 km/h) |
| 65 mph (104.61 km/h) | 82.55 mph (132.85 km/h) |
| 70 mph (112.65 km/h) | 88.9 mph (143.07 km/h) |
| 75 mph (120.7 km/h) | 95.25 mph (153.29 km/h) |
| 80 mph (128.75 km/h) | 101.6 mph (163.5 km/h) |
| 85 mph (136.79 km/h) | 107.95 mph (173.72 km/h) |
| 90 mph (144.84 km/h) | 114.3 mph (183.94 km/h) |
| 95 mph (152.89 km/h) | 120.65 mph (194.16 km/h) |
| 100 mph (160.93 km/h) | 127 mph (204.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1552 | 1804 | 1942 | 2028 | 2121 | 2187 | 2259 | 2345 | 2464 | 2583 | 2715 | 2821 | 3012 | 3224 | 3389 | 3495 | 3554 | 3772 | 4076 | 4737 |
Better Fuel Economy Factory Ratios Increased Power
