Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 145/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 27.7 (703.7) | 0.57 (14.5) 2.1% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 85.24 (2165.19) | 87.04 (2210.74) | 1.79 (45.55) 2.1% |
| Sidewall Height inches (mm) | 4.57 (116) | 4.85 (123.25) | 0.29 (7.25) 6.3% |
| Revolutions per mile (km) | 743.28 (461.85) | 727.97 (452.34) | -15.32 (-9.52) -2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.86 km/h) |
| 25 mph (40.23 km/h) | 25.53 mph (41.08 km/h) |
| 30 mph (48.28 km/h) | 30.63 mph (49.3 km/h) |
| 35 mph (56.33 km/h) | 35.74 mph (57.51 km/h) |
| 40 mph (64.37 km/h) | 40.84 mph (65.73 km/h) |
| 45 mph (72.42 km/h) | 45.95 mph (73.94 km/h) |
| 50 mph (80.47 km/h) | 51.05 mph (82.16 km/h) |
| 55 mph (88.51 km/h) | 56.16 mph (90.38 km/h) |
| 60 mph (96.56 km/h) | 61.26 mph (98.59 km/h) |
| 65 mph (104.61 km/h) | 66.37 mph (106.81 km/h) |
| 70 mph (112.65 km/h) | 71.47 mph (115.02 km/h) |
| 75 mph (120.7 km/h) | 76.58 mph (123.24 km/h) |
| 80 mph (128.75 km/h) | 81.68 mph (131.46 km/h) |
| 85 mph (136.79 km/h) | 86.79 mph (139.67 km/h) |
| 90 mph (144.84 km/h) | 91.89 mph (147.89 km/h) |
| 95 mph (152.89 km/h) | 97 mph (156.1 km/h) |
| 100 mph (160.93 km/h) | 102.1 mph (164.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1853 | 2152 | 2318 | 2420 | 2530 | 2609 | 2696 | 2799 | 2940 | 3082 | 3240 | 3366 | 3595 | 3847 | 4044 | 4170 | 4241 | 4501 | 4864 | 5652 |
Better Fuel Economy Factory Ratios Increased Power
