Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 145/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 27.13 (689.2) | -0.57 (-14.5) -2.1% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 87.04 (2210.74) | 85.24 (2165.19) | -1.79 (-45.55) -2.1% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 4.57 (116) | -0.29 (-7.25) -5.9% |
| Revolutions per mile (km) | 727.97 (452.34) | 743.28 (461.85) | 15.32 (9.52) 2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.59 mph (31.52 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.4 km/h) |
| 30 mph (48.28 km/h) | 29.38 mph (47.29 km/h) |
| 35 mph (56.33 km/h) | 34.28 mph (55.17 km/h) |
| 40 mph (64.37 km/h) | 39.18 mph (63.05 km/h) |
| 45 mph (72.42 km/h) | 44.07 mph (70.93 km/h) |
| 50 mph (80.47 km/h) | 48.97 mph (78.81 km/h) |
| 55 mph (88.51 km/h) | 53.87 mph (86.69 km/h) |
| 60 mph (96.56 km/h) | 58.76 mph (94.57 km/h) |
| 65 mph (104.61 km/h) | 63.66 mph (102.45 km/h) |
| 70 mph (112.65 km/h) | 68.56 mph (110.33 km/h) |
| 75 mph (120.7 km/h) | 73.45 mph (118.21 km/h) |
| 80 mph (128.75 km/h) | 78.35 mph (126.09 km/h) |
| 85 mph (136.79 km/h) | 83.25 mph (133.98 km/h) |
| 90 mph (144.84 km/h) | 88.15 mph (141.86 km/h) |
| 95 mph (152.89 km/h) | 93.04 mph (149.74 km/h) |
| 100 mph (160.93 km/h) | 97.94 mph (157.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1892 | 2197 | 2366 | 2471 | 2584 | 2664 | 2753 | 2857 | 3002 | 3147 | 3308 | 3437 | 3670 | 3928 | 4129 | 4258 | 4330 | 4596 | 4966 | 5771 |
Better Fuel Economy Factory Ratios Increased Power
