Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/60-18 | 185/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.32 (643.2) | 28.2 (716.2) | 2.87 (73) 11.3% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 79.55 (2020.67) | 88.58 (2250.01) | 9.03 (229.34) 11.3% |
| Sidewall Height inches (mm) | 3.66 (93) | 5.1 (129.5) | 1.44 (36.5) 39.2% |
| Revolutions per mile (km) | 796.44 (494.88) | 715.26 (444.44) | -81.18 (-50.44) -10.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.27 mph (35.84 km/h) |
| 25 mph (40.23 km/h) | 27.84 mph (44.8 km/h) |
| 30 mph (48.28 km/h) | 33.4 mph (53.76 km/h) |
| 35 mph (56.33 km/h) | 38.97 mph (62.72 km/h) |
| 40 mph (64.37 km/h) | 44.54 mph (71.68 km/h) |
| 45 mph (72.42 km/h) | 50.11 mph (80.64 km/h) |
| 50 mph (80.47 km/h) | 55.67 mph (89.6 km/h) |
| 55 mph (88.51 km/h) | 61.24 mph (98.56 km/h) |
| 60 mph (96.56 km/h) | 66.81 mph (107.52 km/h) |
| 65 mph (104.61 km/h) | 72.38 mph (116.48 km/h) |
| 70 mph (112.65 km/h) | 77.94 mph (125.44 km/h) |
| 75 mph (120.7 km/h) | 83.51 mph (134.4 km/h) |
| 80 mph (128.75 km/h) | 89.08 mph (143.36 km/h) |
| 85 mph (136.79 km/h) | 94.65 mph (152.32 km/h) |
| 90 mph (144.84 km/h) | 100.21 mph (161.28 km/h) |
| 95 mph (152.89 km/h) | 105.78 mph (170.24 km/h) |
| 100 mph (160.93 km/h) | 111.35 mph (179.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1820 | 2115 | 2277 | 2378 | 2486 | 2564 | 2649 | 2750 | 2889 | 3029 | 3183 | 3307 | 3532 | 3780 | 3973 | 4097 | 4167 | 4423 | 4779 | 5554 |
Better Fuel Economy Factory Ratios Increased Power
