Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/55-12 | 185/75-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 19.15 (486.3) | 22.93 (582.3) | 3.78 (96) 19.7% |
| Width inches (mm) | 6.5 (165) | 7.28 (185) | 0.79 (20) 12.1% |
| Circum. inches (mm) | 60.15 (1527.76) | 72.02 (1829.35) | 11.87 (301.59) 19.7% |
| Sidewall Height inches (mm) | 3.57 (90.75) | 5.46 (138.75) | 1.89 (48) 52.9% |
| Revolutions per mile (km) | 1053.4 (654.55) | 879.74 (546.64) | -173.67 (-107.91) -16.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.95 mph (38.54 km/h) |
| 25 mph (40.23 km/h) | 29.94 mph (48.18 km/h) |
| 30 mph (48.28 km/h) | 35.92 mph (57.81 km/h) |
| 35 mph (56.33 km/h) | 41.91 mph (67.45 km/h) |
| 40 mph (64.37 km/h) | 47.9 mph (77.08 km/h) |
| 45 mph (72.42 km/h) | 53.88 mph (86.72 km/h) |
| 50 mph (80.47 km/h) | 59.87 mph (96.35 km/h) |
| 55 mph (88.51 km/h) | 65.86 mph (105.99 km/h) |
| 60 mph (96.56 km/h) | 71.84 mph (115.62 km/h) |
| 65 mph (104.61 km/h) | 77.83 mph (125.26 km/h) |
| 70 mph (112.65 km/h) | 83.82 mph (134.89 km/h) |
| 75 mph (120.7 km/h) | 89.81 mph (144.53 km/h) |
| 80 mph (128.75 km/h) | 95.79 mph (154.16 km/h) |
| 85 mph (136.79 km/h) | 101.78 mph (163.8 km/h) |
| 90 mph (144.84 km/h) | 107.77 mph (173.43 km/h) |
| 95 mph (152.89 km/h) | 113.75 mph (183.07 km/h) |
| 100 mph (160.93 km/h) | 119.74 mph (192.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2239 | 2601 | 2801 | 2925 | 3058 | 3153 | 3258 | 3382 | 3553 | 3725 | 3915 | 4068 | 4344 | 4649 | 4887 | 5040 | 5125 | 5440 | 5878 | 6831 |
Better Fuel Economy Factory Ratios Increased Power
