Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/90-16 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.28 (667.4) | 28.37 (720.7) | 2.1 (53.3) 8% |
| Width inches (mm) | 5.71 (145) | 6.1 (155) | 0.39 (10) 6.9% |
| Circum. inches (mm) | 82.55 (2096.7) | 89.14 (2264.15) | 6.59 (167.45) 8% |
| Sidewall Height inches (mm) | 5.14 (130.5) | 5.19 (131.75) | 0.05 (1.25) 1% |
| Revolutions per mile (km) | 767.56 (476.94) | 710.8 (441.67) | -56.77 (-35.27) -7.4% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.6 mph (34.76 km/h) |
| 25 mph (40.23 km/h) | 27 mph (43.45 km/h) |
| 30 mph (48.28 km/h) | 32.4 mph (52.14 km/h) |
| 35 mph (56.33 km/h) | 37.8 mph (60.83 km/h) |
| 40 mph (64.37 km/h) | 43.19 mph (69.51 km/h) |
| 45 mph (72.42 km/h) | 48.59 mph (78.2 km/h) |
| 50 mph (80.47 km/h) | 53.99 mph (86.89 km/h) |
| 55 mph (88.51 km/h) | 59.39 mph (95.58 km/h) |
| 60 mph (96.56 km/h) | 64.79 mph (104.27 km/h) |
| 65 mph (104.61 km/h) | 70.19 mph (112.96 km/h) |
| 70 mph (112.65 km/h) | 75.59 mph (121.65 km/h) |
| 75 mph (120.7 km/h) | 80.99 mph (130.34 km/h) |
| 80 mph (128.75 km/h) | 86.39 mph (139.03 km/h) |
| 85 mph (136.79 km/h) | 91.79 mph (147.72 km/h) |
| 90 mph (144.84 km/h) | 97.19 mph (156.41 km/h) |
| 95 mph (152.89 km/h) | 102.59 mph (165.1 km/h) |
| 100 mph (160.93 km/h) | 107.99 mph (173.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1809 | 2101 | 2263 | 2363 | 2471 | 2548 | 2632 | 2733 | 2871 | 3010 | 3164 | 3287 | 3510 | 3756 | 3949 | 4072 | 4141 | 4395 | 4749 | 5519 |
Better Fuel Economy Factory Ratios Increased Power
