Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 155/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 25.93 (658.7) | -1.77 (-45) -6.4% |
| Width inches (mm) | 5.71 (145) | 6.1 (155) | 0.39 (10) 6.9% |
| Circum. inches (mm) | 87.04 (2210.74) | 81.47 (2069.37) | -5.57 (-141.37) -6.4% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 3.97 (100.75) | -0.89 (-22.5) -18.3% |
| Revolutions per mile (km) | 727.97 (452.34) | 777.7 (483.24) | 49.73 (30.9) 6.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.72 mph (30.13 km/h) |
| 25 mph (40.23 km/h) | 23.4 mph (37.66 km/h) |
| 30 mph (48.28 km/h) | 28.08 mph (45.19 km/h) |
| 35 mph (56.33 km/h) | 32.76 mph (52.73 km/h) |
| 40 mph (64.37 km/h) | 37.44 mph (60.26 km/h) |
| 45 mph (72.42 km/h) | 42.12 mph (67.79 km/h) |
| 50 mph (80.47 km/h) | 46.8 mph (75.32 km/h) |
| 55 mph (88.51 km/h) | 51.48 mph (82.85 km/h) |
| 60 mph (96.56 km/h) | 56.16 mph (90.39 km/h) |
| 65 mph (104.61 km/h) | 60.84 mph (97.92 km/h) |
| 70 mph (112.65 km/h) | 65.52 mph (105.45 km/h) |
| 75 mph (120.7 km/h) | 70.2 mph (112.98 km/h) |
| 80 mph (128.75 km/h) | 74.88 mph (120.51 km/h) |
| 85 mph (136.79 km/h) | 79.56 mph (128.05 km/h) |
| 90 mph (144.84 km/h) | 84.24 mph (135.58 km/h) |
| 95 mph (152.89 km/h) | 88.92 mph (143.11 km/h) |
| 100 mph (160.93 km/h) | 93.61 mph (150.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1979 | 2299 | 2476 | 2585 | 2703 | 2788 | 2880 | 2990 | 3141 | 3293 | 3461 | 3596 | 3840 | 4110 | 4320 | 4455 | 4531 | 4809 | 5196 | 6038 |
Better Fuel Economy Factory Ratios Increased Power
