Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 205/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 26.88 (682.7) | 0.85 (21.5) 3.3% |
| Width inches (mm) | 4.72 (120) | 8.07 (205) | 3.35 (85) 70.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 84.44 (2144.77) | 2.66 (67.54) 3.3% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.44 (112.75) | 0.42 (10.75) 10.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 750.36 (466.25) | -24.4 (-15.16) -3.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.65 mph (33.23 km/h) |
| 25 mph (40.23 km/h) | 25.81 mph (41.54 km/h) |
| 30 mph (48.28 km/h) | 30.98 mph (49.85 km/h) |
| 35 mph (56.33 km/h) | 36.14 mph (58.16 km/h) |
| 40 mph (64.37 km/h) | 41.3 mph (66.47 km/h) |
| 45 mph (72.42 km/h) | 46.46 mph (74.78 km/h) |
| 50 mph (80.47 km/h) | 51.63 mph (83.08 km/h) |
| 55 mph (88.51 km/h) | 56.79 mph (91.39 km/h) |
| 60 mph (96.56 km/h) | 61.95 mph (99.7 km/h) |
| 65 mph (104.61 km/h) | 67.11 mph (108.01 km/h) |
| 70 mph (112.65 km/h) | 72.28 mph (116.32 km/h) |
| 75 mph (120.7 km/h) | 77.44 mph (124.63 km/h) |
| 80 mph (128.75 km/h) | 82.6 mph (132.93 km/h) |
| 85 mph (136.79 km/h) | 87.76 mph (141.24 km/h) |
| 90 mph (144.84 km/h) | 92.93 mph (149.55 km/h) |
| 95 mph (152.89 km/h) | 98.09 mph (157.86 km/h) |
| 100 mph (160.93 km/h) | 103.25 mph (166.17 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
