Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 305/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 28.81 (731.7) | -0.41 (-10.5) -1.4% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 91.8 (2331.69) | 90.5 (2298.7) | -1.3 (-32.99) -1.4% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 5.4 (137.25) | -0.21 (-5.25) -3.7% |
| Revolutions per mile (km) | 690.2 (428.87) | 700.11 (435.03) | 9.9 (6.15) 1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.72 mph (31.73 km/h) |
| 25 mph (40.23 km/h) | 24.65 mph (39.66 km/h) |
| 30 mph (48.28 km/h) | 29.58 mph (47.6 km/h) |
| 35 mph (56.33 km/h) | 34.5 mph (55.53 km/h) |
| 40 mph (64.37 km/h) | 39.43 mph (63.46 km/h) |
| 45 mph (72.42 km/h) | 44.36 mph (71.4 km/h) |
| 50 mph (80.47 km/h) | 49.29 mph (79.33 km/h) |
| 55 mph (88.51 km/h) | 54.22 mph (87.26 km/h) |
| 60 mph (96.56 km/h) | 59.15 mph (95.19 km/h) |
| 65 mph (104.61 km/h) | 64.08 mph (103.13 km/h) |
| 70 mph (112.65 km/h) | 69.01 mph (111.06 km/h) |
| 75 mph (120.7 km/h) | 73.94 mph (118.99 km/h) |
| 80 mph (128.75 km/h) | 78.87 mph (126.93 km/h) |
| 85 mph (136.79 km/h) | 83.8 mph (134.86 km/h) |
| 90 mph (144.84 km/h) | 88.73 mph (142.79 km/h) |
| 95 mph (152.89 km/h) | 93.66 mph (150.73 km/h) |
| 100 mph (160.93 km/h) | 98.59 mph (158.66 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1782 | 2070 | 2229 | 2328 | 2434 | 2509 | 2593 | 2691 | 2828 | 2964 | 3116 | 3237 | 3457 | 3700 | 3889 | 4011 | 4079 | 4329 | 4678 | 5436 |
Better Fuel Economy Factory Ratios Increased Power
