Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 205/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 26.88 (682.7) | 1.08 (27.5) 4.2% |
| Width inches (mm) | 7.09 (180) | 8.07 (205) | 0.98 (25) 13.9% |
| Circum. inches (mm) | 81.04 (2058.37) | 84.44 (2144.77) | 3.4 (86.39) 4.2% |
| Sidewall Height inches (mm) | 3.9 (99) | 4.44 (112.75) | 0.54 (13.75) 13.9% |
| Revolutions per mile (km) | 781.85 (485.82) | 750.36 (466.25) | -31.49 (-19.57) -4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.84 mph (33.54 km/h) |
| 25 mph (40.23 km/h) | 26.05 mph (41.92 km/h) |
| 30 mph (48.28 km/h) | 31.26 mph (50.31 km/h) |
| 35 mph (56.33 km/h) | 36.47 mph (58.69 km/h) |
| 40 mph (64.37 km/h) | 41.68 mph (67.08 km/h) |
| 45 mph (72.42 km/h) | 46.89 mph (75.46 km/h) |
| 50 mph (80.47 km/h) | 52.1 mph (83.84 km/h) |
| 55 mph (88.51 km/h) | 57.31 mph (92.23 km/h) |
| 60 mph (96.56 km/h) | 62.52 mph (100.61 km/h) |
| 65 mph (104.61 km/h) | 67.73 mph (109 km/h) |
| 70 mph (112.65 km/h) | 72.94 mph (117.38 km/h) |
| 75 mph (120.7 km/h) | 78.15 mph (125.77 km/h) |
| 80 mph (128.75 km/h) | 83.36 mph (134.15 km/h) |
| 85 mph (136.79 km/h) | 88.57 mph (142.54 km/h) |
| 90 mph (144.84 km/h) | 93.78 mph (150.92 km/h) |
| 95 mph (152.89 km/h) | 98.99 mph (159.3 km/h) |
| 100 mph (160.93 km/h) | 104.2 mph (167.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1910 | 2218 | 2389 | 2495 | 2608 | 2690 | 2779 | 2885 | 3031 | 3177 | 3340 | 3470 | 3705 | 3965 | 4168 | 4298 | 4372 | 4640 | 5014 | 5826 |
Better Fuel Economy Factory Ratios Increased Power
