Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 145/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 27.7 (703.7) | 2.01 (51) 7.8% |
| Width inches (mm) | 4.53 (115) | 5.71 (145) | 1.18 (30) 26.1% |
| Circum. inches (mm) | 80.73 (2050.52) | 87.04 (2210.74) | 6.31 (160.22) 7.8% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 4.85 (123.25) | 1 (25.5) 26.1% |
| Revolutions per mile (km) | 784.85 (487.68) | 727.97 (452.34) | -56.88 (-35.34) -7.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.56 mph (34.7 km/h) |
| 25 mph (40.23 km/h) | 26.95 mph (43.38 km/h) |
| 30 mph (48.28 km/h) | 32.34 mph (52.05 km/h) |
| 35 mph (56.33 km/h) | 37.73 mph (60.73 km/h) |
| 40 mph (64.37 km/h) | 43.13 mph (69.4 km/h) |
| 45 mph (72.42 km/h) | 48.52 mph (78.08 km/h) |
| 50 mph (80.47 km/h) | 53.91 mph (86.75 km/h) |
| 55 mph (88.51 km/h) | 59.3 mph (95.43 km/h) |
| 60 mph (96.56 km/h) | 64.69 mph (104.11 km/h) |
| 65 mph (104.61 km/h) | 70.08 mph (112.78 km/h) |
| 70 mph (112.65 km/h) | 75.47 mph (121.46 km/h) |
| 75 mph (120.7 km/h) | 80.86 mph (130.13 km/h) |
| 80 mph (128.75 km/h) | 86.25 mph (138.81 km/h) |
| 85 mph (136.79 km/h) | 91.64 mph (147.48 km/h) |
| 90 mph (144.84 km/h) | 97.03 mph (156.16 km/h) |
| 95 mph (152.89 km/h) | 102.42 mph (164.83 km/h) |
| 100 mph (160.93 km/h) | 107.81 mph (173.51 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
