Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 205/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 25.26 (641.7) | -0.53 (-13.5) -2.1% |
| Width inches (mm) | 7.09 (180) | 8.07 (205) | 0.98 (25) 13.9% |
| Circum. inches (mm) | 81.04 (2058.37) | 79.37 (2015.96) | -1.67 (-42.41) -2.1% |
| Sidewall Height inches (mm) | 3.9 (99) | 3.63 (92.25) | -0.27 (-6.75) -6.8% |
| Revolutions per mile (km) | 781.85 (485.82) | 798.3 (496.04) | 16.45 (10.22) 2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.59 mph (31.52 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.4 km/h) |
| 30 mph (48.28 km/h) | 29.38 mph (47.29 km/h) |
| 35 mph (56.33 km/h) | 34.28 mph (55.17 km/h) |
| 40 mph (64.37 km/h) | 39.18 mph (63.05 km/h) |
| 45 mph (72.42 km/h) | 44.07 mph (70.93 km/h) |
| 50 mph (80.47 km/h) | 48.97 mph (78.81 km/h) |
| 55 mph (88.51 km/h) | 53.87 mph (86.69 km/h) |
| 60 mph (96.56 km/h) | 58.76 mph (94.57 km/h) |
| 65 mph (104.61 km/h) | 63.66 mph (102.45 km/h) |
| 70 mph (112.65 km/h) | 68.56 mph (110.33 km/h) |
| 75 mph (120.7 km/h) | 73.45 mph (118.21 km/h) |
| 80 mph (128.75 km/h) | 78.35 mph (126.09 km/h) |
| 85 mph (136.79 km/h) | 83.25 mph (133.98 km/h) |
| 90 mph (144.84 km/h) | 88.15 mph (141.86 km/h) |
| 95 mph (152.89 km/h) | 93.04 mph (149.74 km/h) |
| 100 mph (160.93 km/h) | 97.94 mph (157.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2032 | 2360 | 2542 | 2654 | 2775 | 2861 | 2957 | 3069 | 3225 | 3380 | 3553 | 3691 | 3942 | 4219 | 4435 | 4573 | 4651 | 4936 | 5334 | 6198 |
Better Fuel Economy Factory Ratios Increased Power
