Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 180/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 25.8 (655.2) | -2.13 (-54) -7.6% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 87.72 (2228.02) | 81.04 (2058.37) | -6.68 (-169.65) -7.6% |
| Sidewall Height inches (mm) | 4.96 (126) | 3.9 (99) | -1.06 (-27) -21.4% |
| Revolutions per mile (km) | 722.32 (448.83) | 781.85 (485.82) | 59.53 (36.99) 8.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.48 mph (29.74 km/h) |
| 25 mph (40.23 km/h) | 23.1 mph (37.17 km/h) |
| 30 mph (48.28 km/h) | 27.72 mph (44.6 km/h) |
| 35 mph (56.33 km/h) | 32.34 mph (52.04 km/h) |
| 40 mph (64.37 km/h) | 36.95 mph (59.47 km/h) |
| 45 mph (72.42 km/h) | 41.57 mph (66.91 km/h) |
| 50 mph (80.47 km/h) | 46.19 mph (74.34 km/h) |
| 55 mph (88.51 km/h) | 50.81 mph (81.77 km/h) |
| 60 mph (96.56 km/h) | 55.43 mph (89.21 km/h) |
| 65 mph (104.61 km/h) | 60.05 mph (96.64 km/h) |
| 70 mph (112.65 km/h) | 64.67 mph (104.08 km/h) |
| 75 mph (120.7 km/h) | 69.29 mph (111.51 km/h) |
| 80 mph (128.75 km/h) | 73.91 mph (118.94 km/h) |
| 85 mph (136.79 km/h) | 78.53 mph (126.38 km/h) |
| 90 mph (144.84 km/h) | 83.15 mph (133.81 km/h) |
| 95 mph (152.89 km/h) | 87.77 mph (141.25 km/h) |
| 100 mph (160.93 km/h) | 92.39 mph (148.68 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
