Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-12 | 145/75-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 20.5 (520.8) | 20.56 (522.3) | 0.06 (1.5) 0.3% |
| Width inches (mm) | 5.31 (135) | 5.71 (145) | 0.39 (10) 7.4% |
| Circum. inches (mm) | 64.42 (1636.14) | 64.6 (1640.85) | 0.19 (4.71) 0.3% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.28 (108.75) | 0.03 (0.75) 0.7% |
| Revolutions per mile (km) | 983.62 (611.19) | 980.8 (609.44) | -2.82 (-1.76) -0.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.06 mph (32.28 km/h) |
| 25 mph (40.23 km/h) | 25.07 mph (40.35 km/h) |
| 30 mph (48.28 km/h) | 30.09 mph (48.42 km/h) |
| 35 mph (56.33 km/h) | 35.1 mph (56.49 km/h) |
| 40 mph (64.37 km/h) | 40.12 mph (64.56 km/h) |
| 45 mph (72.42 km/h) | 45.13 mph (72.63 km/h) |
| 50 mph (80.47 km/h) | 50.14 mph (80.7 km/h) |
| 55 mph (88.51 km/h) | 55.16 mph (88.77 km/h) |
| 60 mph (96.56 km/h) | 60.17 mph (96.84 km/h) |
| 65 mph (104.61 km/h) | 65.19 mph (104.91 km/h) |
| 70 mph (112.65 km/h) | 70.2 mph (112.98 km/h) |
| 75 mph (120.7 km/h) | 75.22 mph (121.05 km/h) |
| 80 mph (128.75 km/h) | 80.23 mph (129.12 km/h) |
| 85 mph (136.79 km/h) | 85.24 mph (137.19 km/h) |
| 90 mph (144.84 km/h) | 90.26 mph (145.26 km/h) |
| 95 mph (152.89 km/h) | 95.27 mph (153.33 km/h) |
| 100 mph (160.93 km/h) | 100.29 mph (161.4 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
