Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-18 | 185/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 28.2 (716.2) | 1.69 (43) 6.4% |
| Width inches (mm) | 7.09 (180) | 7.28 (185) | 0.2 (5) 2.8% |
| Circum. inches (mm) | 83.26 (2114.92) | 88.58 (2250.01) | 5.32 (135.09) 6.4% |
| Sidewall Height inches (mm) | 4.25 (108) | 5.1 (129.5) | 0.85 (21.5) 19.9% |
| Revolutions per mile (km) | 760.95 (472.83) | 715.26 (444.44) | -45.69 (-28.39) -6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.28 mph (34.24 km/h) |
| 25 mph (40.23 km/h) | 26.6 mph (42.8 km/h) |
| 30 mph (48.28 km/h) | 31.92 mph (51.36 km/h) |
| 35 mph (56.33 km/h) | 37.24 mph (59.92 km/h) |
| 40 mph (64.37 km/h) | 42.55 mph (68.49 km/h) |
| 45 mph (72.42 km/h) | 47.87 mph (77.05 km/h) |
| 50 mph (80.47 km/h) | 53.19 mph (85.61 km/h) |
| 55 mph (88.51 km/h) | 58.51 mph (94.17 km/h) |
| 60 mph (96.56 km/h) | 63.83 mph (102.73 km/h) |
| 65 mph (104.61 km/h) | 69.15 mph (111.29 km/h) |
| 70 mph (112.65 km/h) | 74.47 mph (119.85 km/h) |
| 75 mph (120.7 km/h) | 79.79 mph (128.41 km/h) |
| 80 mph (128.75 km/h) | 85.11 mph (136.97 km/h) |
| 85 mph (136.79 km/h) | 90.43 mph (145.53 km/h) |
| 90 mph (144.84 km/h) | 95.75 mph (154.09 km/h) |
| 95 mph (152.89 km/h) | 101.07 mph (162.65 km/h) |
| 100 mph (160.93 km/h) | 106.39 mph (171.21 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
