Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 145/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 27.7 (703.7) | -1.28 (-32.5) -4.4% |
| Width inches (mm) | 6.1 (155) | 5.71 (145) | -0.39 (-10) -6.5% |
| Circum. inches (mm) | 91.06 (2312.84) | 87.04 (2210.74) | -4.02 (-102.1) -4.4% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.85 (123.25) | -0.64 (-16.25) -11.6% |
| Revolutions per mile (km) | 695.83 (432.37) | 727.97 (452.34) | 32.14 (19.97) 4.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.12 mph (30.77 km/h) |
| 25 mph (40.23 km/h) | 23.9 mph (38.46 km/h) |
| 30 mph (48.28 km/h) | 28.68 mph (46.15 km/h) |
| 35 mph (56.33 km/h) | 33.45 mph (53.84 km/h) |
| 40 mph (64.37 km/h) | 38.23 mph (61.53 km/h) |
| 45 mph (72.42 km/h) | 43.01 mph (69.22 km/h) |
| 50 mph (80.47 km/h) | 47.79 mph (76.92 km/h) |
| 55 mph (88.51 km/h) | 52.57 mph (84.61 km/h) |
| 60 mph (96.56 km/h) | 57.35 mph (92.3 km/h) |
| 65 mph (104.61 km/h) | 62.13 mph (99.99 km/h) |
| 70 mph (112.65 km/h) | 66.91 mph (107.68 km/h) |
| 75 mph (120.7 km/h) | 71.69 mph (115.37 km/h) |
| 80 mph (128.75 km/h) | 76.47 mph (123.06 km/h) |
| 85 mph (136.79 km/h) | 81.25 mph (130.76 km/h) |
| 90 mph (144.84 km/h) | 86.03 mph (138.45 km/h) |
| 95 mph (152.89 km/h) | 90.81 mph (146.14 km/h) |
| 100 mph (160.93 km/h) | 95.59 mph (153.83 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
