Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 180/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 25.09 (637.2) | -0.71 (-18) -2.7% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 81.04 (2058.37) | 78.81 (2001.82) | -2.23 (-56.55) -2.7% |
| Sidewall Height inches (mm) | 3.9 (99) | 3.54 (90) | -0.35 (-9) -9.1% |
| Revolutions per mile (km) | 781.85 (485.82) | 803.94 (499.54) | 22.09 (13.72) 2.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.45 mph (31.3 km/h) |
| 25 mph (40.23 km/h) | 24.31 mph (39.13 km/h) |
| 30 mph (48.28 km/h) | 29.18 mph (46.95 km/h) |
| 35 mph (56.33 km/h) | 34.04 mph (54.78 km/h) |
| 40 mph (64.37 km/h) | 38.9 mph (62.61 km/h) |
| 45 mph (72.42 km/h) | 43.76 mph (70.43 km/h) |
| 50 mph (80.47 km/h) | 48.63 mph (78.26 km/h) |
| 55 mph (88.51 km/h) | 53.49 mph (86.08 km/h) |
| 60 mph (96.56 km/h) | 58.35 mph (93.91 km/h) |
| 65 mph (104.61 km/h) | 63.21 mph (101.73 km/h) |
| 70 mph (112.65 km/h) | 68.08 mph (109.56 km/h) |
| 75 mph (120.7 km/h) | 72.94 mph (117.39 km/h) |
| 80 mph (128.75 km/h) | 77.8 mph (125.21 km/h) |
| 85 mph (136.79 km/h) | 82.66 mph (133.04 km/h) |
| 90 mph (144.84 km/h) | 87.53 mph (140.86 km/h) |
| 95 mph (152.89 km/h) | 92.39 mph (148.69 km/h) |
| 100 mph (160.93 km/h) | 97.25 mph (156.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2046 | 2377 | 2560 | 2673 | 2795 | 2882 | 2977 | 3091 | 3247 | 3404 | 3578 | 3717 | 3970 | 4248 | 4466 | 4605 | 4684 | 4971 | 5372 | 6242 |
Better Fuel Economy Factory Ratios Increased Power
