Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/60-18 | 185/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.32 (643.2) | 26.01 (660.7) | 0.69 (17.5) 2.7% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 79.55 (2020.67) | 81.72 (2075.65) | 2.16 (54.98) 2.7% |
| Sidewall Height inches (mm) | 3.66 (93) | 4.01 (101.75) | 0.34 (8.75) 9.4% |
| Revolutions per mile (km) | 796.44 (494.88) | 775.34 (481.78) | -21.1 (-13.11) -2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.54 mph (33.06 km/h) |
| 25 mph (40.23 km/h) | 25.68 mph (41.33 km/h) |
| 30 mph (48.28 km/h) | 30.82 mph (49.59 km/h) |
| 35 mph (56.33 km/h) | 35.95 mph (57.86 km/h) |
| 40 mph (64.37 km/h) | 41.09 mph (66.13 km/h) |
| 45 mph (72.42 km/h) | 46.22 mph (74.39 km/h) |
| 50 mph (80.47 km/h) | 51.36 mph (82.66 km/h) |
| 55 mph (88.51 km/h) | 56.5 mph (90.92 km/h) |
| 60 mph (96.56 km/h) | 61.63 mph (99.19 km/h) |
| 65 mph (104.61 km/h) | 66.77 mph (107.45 km/h) |
| 70 mph (112.65 km/h) | 71.9 mph (115.72 km/h) |
| 75 mph (120.7 km/h) | 77.04 mph (123.99 km/h) |
| 80 mph (128.75 km/h) | 82.18 mph (132.25 km/h) |
| 85 mph (136.79 km/h) | 87.31 mph (140.52 km/h) |
| 90 mph (144.84 km/h) | 92.45 mph (148.78 km/h) |
| 95 mph (152.89 km/h) | 97.58 mph (157.05 km/h) |
| 100 mph (160.93 km/h) | 102.72 mph (165.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1973 | 2292 | 2468 | 2578 | 2695 | 2779 | 2871 | 2981 | 3132 | 3283 | 3451 | 3585 | 3829 | 4097 | 4307 | 4442 | 4517 | 4794 | 5180 | 6020 |
Better Fuel Economy Factory Ratios Increased Power
