Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 180/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 28.63 (727.2) | 2.83 (72) 11% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 81.04 (2058.37) | 89.94 (2284.57) | 8.91 (226.19) 11% |
| Sidewall Height inches (mm) | 3.9 (99) | 5.31 (135) | 1.42 (36) 36.4% |
| Revolutions per mile (km) | 781.85 (485.82) | 704.44 (437.72) | -77.41 (-48.1) -9.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.2 mph (35.72 km/h) |
| 25 mph (40.23 km/h) | 27.75 mph (44.65 km/h) |
| 30 mph (48.28 km/h) | 33.3 mph (53.59 km/h) |
| 35 mph (56.33 km/h) | 38.85 mph (62.52 km/h) |
| 40 mph (64.37 km/h) | 44.4 mph (71.45 km/h) |
| 45 mph (72.42 km/h) | 49.95 mph (80.38 km/h) |
| 50 mph (80.47 km/h) | 55.49 mph (89.31 km/h) |
| 55 mph (88.51 km/h) | 61.04 mph (98.24 km/h) |
| 60 mph (96.56 km/h) | 66.59 mph (107.17 km/h) |
| 65 mph (104.61 km/h) | 72.14 mph (116.1 km/h) |
| 70 mph (112.65 km/h) | 77.69 mph (125.03 km/h) |
| 75 mph (120.7 km/h) | 83.24 mph (133.96 km/h) |
| 80 mph (128.75 km/h) | 88.79 mph (142.9 km/h) |
| 85 mph (136.79 km/h) | 94.34 mph (151.83 km/h) |
| 90 mph (144.84 km/h) | 99.89 mph (160.76 km/h) |
| 95 mph (152.89 km/h) | 105.44 mph (169.69 km/h) |
| 100 mph (160.93 km/h) | 110.99 mph (178.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1793 | 2083 | 2243 | 2342 | 2449 | 2525 | 2609 | 2708 | 2845 | 2983 | 3135 | 3257 | 3479 | 3723 | 3913 | 4035 | 4104 | 4356 | 4707 | 5470 |
Better Fuel Economy Factory Ratios Increased Power
