Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 150/70-18 | 180/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.27 (667.2) | 25.8 (655.2) | -0.47 (-12) -1.8% |
| Width inches (mm) | 5.91 (150) | 7.09 (180) | 1.18 (30) 20% |
| Circum. inches (mm) | 82.52 (2096.07) | 81.04 (2058.37) | -1.48 (-37.7) -1.8% |
| Sidewall Height inches (mm) | 4.13 (105) | 3.9 (99) | -0.24 (-6) -5.7% |
| Revolutions per mile (km) | 767.79 (477.08) | 781.85 (485.82) | 14.06 (8.74) 1.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.64 mph (31.61 km/h) |
| 25 mph (40.23 km/h) | 24.55 mph (39.51 km/h) |
| 30 mph (48.28 km/h) | 29.46 mph (47.41 km/h) |
| 35 mph (56.33 km/h) | 34.37 mph (55.31 km/h) |
| 40 mph (64.37 km/h) | 39.28 mph (63.22 km/h) |
| 45 mph (72.42 km/h) | 44.19 mph (71.12 km/h) |
| 50 mph (80.47 km/h) | 49.1 mph (79.02 km/h) |
| 55 mph (88.51 km/h) | 54.01 mph (86.92 km/h) |
| 60 mph (96.56 km/h) | 58.92 mph (94.82 km/h) |
| 65 mph (104.61 km/h) | 63.83 mph (102.73 km/h) |
| 70 mph (112.65 km/h) | 68.74 mph (110.63 km/h) |
| 75 mph (120.7 km/h) | 73.65 mph (118.53 km/h) |
| 80 mph (128.75 km/h) | 78.56 mph (126.43 km/h) |
| 85 mph (136.79 km/h) | 83.47 mph (134.33 km/h) |
| 90 mph (144.84 km/h) | 88.38 mph (142.24 km/h) |
| 95 mph (152.89 km/h) | 93.29 mph (150.14 km/h) |
| 100 mph (160.93 km/h) | 98.2 mph (158.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2311 | 2489 | 2599 | 2718 | 2802 | 2896 | 3006 | 3158 | 3310 | 3480 | 3615 | 3861 | 4132 | 4343 | 4479 | 4555 | 4834 | 5224 | 6071 |
Better Fuel Economy Factory Ratios Increased Power
