Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 305/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 34.81 (884.2) | 6.89 (175) 24.7% |
| Width inches (mm) | 7.09 (180) | 12.01 (305) | 4.92 (125) 69.4% |
| Circum. inches (mm) | 87.72 (2228.02) | 109.36 (2777.8) | 21.64 (549.78) 24.7% |
| Sidewall Height inches (mm) | 4.96 (126) | 8.41 (213.5) | 3.44 (87.5) 69.4% |
| Revolutions per mile (km) | 722.32 (448.83) | 579.36 (360) | -142.96 (-88.83) -19.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.94 mph (40.13 km/h) |
| 25 mph (40.23 km/h) | 31.17 mph (50.16 km/h) |
| 30 mph (48.28 km/h) | 37.4 mph (60.19 km/h) |
| 35 mph (56.33 km/h) | 43.64 mph (70.23 km/h) |
| 40 mph (64.37 km/h) | 49.87 mph (80.26 km/h) |
| 45 mph (72.42 km/h) | 56.1 mph (90.29 km/h) |
| 50 mph (80.47 km/h) | 62.34 mph (100.32 km/h) |
| 55 mph (88.51 km/h) | 68.57 mph (110.36 km/h) |
| 60 mph (96.56 km/h) | 74.81 mph (120.39 km/h) |
| 65 mph (104.61 km/h) | 81.04 mph (130.42 km/h) |
| 70 mph (112.65 km/h) | 87.27 mph (140.45 km/h) |
| 75 mph (120.7 km/h) | 93.51 mph (150.48 km/h) |
| 80 mph (128.75 km/h) | 99.74 mph (160.52 km/h) |
| 85 mph (136.79 km/h) | 105.97 mph (170.55 km/h) |
| 90 mph (144.84 km/h) | 112.21 mph (180.58 km/h) |
| 95 mph (152.89 km/h) | 118.44 mph (190.61 km/h) |
| 100 mph (160.93 km/h) | 124.68 mph (200.65 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1474 | 1713 | 1845 | 1926 | 2014 | 2077 | 2146 | 2227 | 2340 | 2453 | 2579 | 2679 | 2861 | 3062 | 3218 | 3319 | 3375 | 3582 | 3871 | 4498 |
Better Fuel Economy Factory Ratios Increased Power
