Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/55-16 | 255/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 22.28 (565.9) | 24.02 (610.2) | 1.74 (44.3) 7.8% |
| Width inches (mm) | 5.71 (145) | 10.04 (255) | 4.33 (110) 75.9% |
| Circum. inches (mm) | 69.99 (1777.83) | 75.47 (1917) | 5.48 (139.17) 7.8% |
| Sidewall Height inches (mm) | 3.14 (79.75) | 3.01 (76.5) | -0.13 (-3.25) -4.1% |
| Revolutions per mile (km) | 905.23 (562.48) | 839.51 (521.65) | -65.72 (-40.84) -7.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.57 mph (34.71 km/h) |
| 25 mph (40.23 km/h) | 26.96 mph (43.38 km/h) |
| 30 mph (48.28 km/h) | 32.35 mph (52.06 km/h) |
| 35 mph (56.33 km/h) | 37.74 mph (60.74 km/h) |
| 40 mph (64.37 km/h) | 43.13 mph (69.41 km/h) |
| 45 mph (72.42 km/h) | 48.52 mph (78.09 km/h) |
| 50 mph (80.47 km/h) | 53.91 mph (86.77 km/h) |
| 55 mph (88.51 km/h) | 59.31 mph (95.44 km/h) |
| 60 mph (96.56 km/h) | 64.7 mph (104.12 km/h) |
| 65 mph (104.61 km/h) | 70.09 mph (112.8 km/h) |
| 70 mph (112.65 km/h) | 75.48 mph (121.47 km/h) |
| 75 mph (120.7 km/h) | 80.87 mph (130.15 km/h) |
| 80 mph (128.75 km/h) | 86.26 mph (138.83 km/h) |
| 85 mph (136.79 km/h) | 91.65 mph (147.5 km/h) |
| 90 mph (144.84 km/h) | 97.05 mph (156.18 km/h) |
| 95 mph (152.89 km/h) | 102.44 mph (164.86 km/h) |
| 100 mph (160.93 km/h) | 107.83 mph (173.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2136 | 2482 | 2673 | 2791 | 2918 | 3009 | 3109 | 3227 | 3391 | 3555 | 3736 | 3882 | 4146 | 4436 | 4664 | 4809 | 4891 | 5191 | 5609 | 6518 |
Better Fuel Economy Factory Ratios Increased Power
