Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/55-12 | 145/40-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 19.15 (486.3) | 16.57 (420.8) | -2.58 (-65.5) -13.5% |
| Width inches (mm) | 6.5 (165) | 5.71 (145) | -0.79 (-20) -12.1% |
| Circum. inches (mm) | 60.15 (1527.76) | 52.05 (1321.98) | -8.1 (-205.77) -13.5% |
| Sidewall Height inches (mm) | 3.57 (90.75) | 2.28 (58) | -1.29 (-32.75) -36.1% |
| Revolutions per mile (km) | 1053.4 (654.55) | 1217.37 (756.44) | 163.97 (101.89) 15.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.31 mph (27.85 km/h) |
| 25 mph (40.23 km/h) | 21.63 mph (34.81 km/h) |
| 30 mph (48.28 km/h) | 25.96 mph (41.78 km/h) |
| 35 mph (56.33 km/h) | 30.29 mph (48.74 km/h) |
| 40 mph (64.37 km/h) | 34.61 mph (55.7 km/h) |
| 45 mph (72.42 km/h) | 38.94 mph (62.67 km/h) |
| 50 mph (80.47 km/h) | 43.27 mph (69.63 km/h) |
| 55 mph (88.51 km/h) | 47.59 mph (76.59 km/h) |
| 60 mph (96.56 km/h) | 51.92 mph (83.55 km/h) |
| 65 mph (104.61 km/h) | 56.25 mph (90.52 km/h) |
| 70 mph (112.65 km/h) | 60.57 mph (97.48 km/h) |
| 75 mph (120.7 km/h) | 64.9 mph (104.44 km/h) |
| 80 mph (128.75 km/h) | 69.22 mph (111.41 km/h) |
| 85 mph (136.79 km/h) | 73.55 mph (118.37 km/h) |
| 90 mph (144.84 km/h) | 77.88 mph (125.33 km/h) |
| 95 mph (152.89 km/h) | 82.2 mph (132.3 km/h) |
| 100 mph (160.93 km/h) | 86.53 mph (139.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
