Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 185/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 29.65 (753.2) | 2.52 (64) 9.3% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 85.24 (2165.19) | 93.16 (2366.25) | 7.92 (201.06) 9.3% |
| Sidewall Height inches (mm) | 4.57 (116) | 5.83 (148) | 1.26 (32) 27.6% |
| Revolutions per mile (km) | 743.28 (461.85) | 680.12 (422.61) | -63.16 (-39.24) -8.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.86 mph (35.18 km/h) |
| 25 mph (40.23 km/h) | 27.32 mph (43.97 km/h) |
| 30 mph (48.28 km/h) | 32.79 mph (52.76 km/h) |
| 35 mph (56.33 km/h) | 38.25 mph (61.56 km/h) |
| 40 mph (64.37 km/h) | 43.71 mph (70.35 km/h) |
| 45 mph (72.42 km/h) | 49.18 mph (79.15 km/h) |
| 50 mph (80.47 km/h) | 54.64 mph (87.94 km/h) |
| 55 mph (88.51 km/h) | 60.11 mph (96.73 km/h) |
| 60 mph (96.56 km/h) | 65.57 mph (105.53 km/h) |
| 65 mph (104.61 km/h) | 71.04 mph (114.32 km/h) |
| 70 mph (112.65 km/h) | 76.5 mph (123.12 km/h) |
| 75 mph (120.7 km/h) | 81.96 mph (131.91 km/h) |
| 80 mph (128.75 km/h) | 87.43 mph (140.7 km/h) |
| 85 mph (136.79 km/h) | 92.89 mph (149.5 km/h) |
| 90 mph (144.84 km/h) | 98.36 mph (158.29 km/h) |
| 95 mph (152.89 km/h) | 103.82 mph (167.09 km/h) |
| 100 mph (160.93 km/h) | 109.29 mph (175.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1731 | 2011 | 2165 | 2261 | 2364 | 2438 | 2519 | 2615 | 2747 | 2880 | 3027 | 3145 | 3358 | 3594 | 3778 | 3896 | 3962 | 4205 | 4544 | 5281 |
Better Fuel Economy Factory Ratios Increased Power
