Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 145/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 27.13 (689.2) | 1.44 (36.5) 5.6% |
| Width inches (mm) | 4.53 (115) | 5.71 (145) | 1.18 (30) 26.1% |
| Circum. inches (mm) | 80.73 (2050.52) | 85.24 (2165.19) | 4.51 (114.67) 5.6% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 4.57 (116) | 0.72 (18.25) 18.7% |
| Revolutions per mile (km) | 784.85 (487.68) | 743.28 (461.85) | -41.57 (-25.83) -5.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.12 mph (33.99 km/h) |
| 25 mph (40.23 km/h) | 26.4 mph (42.48 km/h) |
| 30 mph (48.28 km/h) | 31.68 mph (50.98 km/h) |
| 35 mph (56.33 km/h) | 36.96 mph (59.48 km/h) |
| 40 mph (64.37 km/h) | 42.24 mph (67.97 km/h) |
| 45 mph (72.42 km/h) | 47.52 mph (76.47 km/h) |
| 50 mph (80.47 km/h) | 52.8 mph (84.97 km/h) |
| 55 mph (88.51 km/h) | 58.08 mph (93.46 km/h) |
| 60 mph (96.56 km/h) | 63.36 mph (101.96 km/h) |
| 65 mph (104.61 km/h) | 68.63 mph (110.46 km/h) |
| 70 mph (112.65 km/h) | 73.91 mph (118.95 km/h) |
| 75 mph (120.7 km/h) | 79.19 mph (127.45 km/h) |
| 80 mph (128.75 km/h) | 84.47 mph (135.95 km/h) |
| 85 mph (136.79 km/h) | 89.75 mph (144.44 km/h) |
| 90 mph (144.84 km/h) | 95.03 mph (152.94 km/h) |
| 95 mph (152.89 km/h) | 100.31 mph (161.44 km/h) |
| 100 mph (160.93 km/h) | 105.59 mph (169.93 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
