Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-20 | 345/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.15 (715) | 32.22 (818.5) | 4.07 (103.5) 14.5% |
| Width inches (mm) | 13.58 (345) | 13.58 (345) | 0 (0) 0% |
| Circum. inches (mm) | 88.43 (2246.24) | 101.24 (2571.39) | 12.8 (325.15) 14.5% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 6.11 (155.25) | 2.04 (51.75) 50% |
| Revolutions per mile (km) | 716.46 (445.19) | 625.86 (388.89) | -90.6 (-56.29) -12.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.9 mph (36.85 km/h) |
| 25 mph (40.23 km/h) | 28.62 mph (46.06 km/h) |
| 30 mph (48.28 km/h) | 34.34 mph (55.27 km/h) |
| 35 mph (56.33 km/h) | 40.07 mph (64.48 km/h) |
| 40 mph (64.37 km/h) | 45.79 mph (73.69 km/h) |
| 45 mph (72.42 km/h) | 51.51 mph (82.9 km/h) |
| 50 mph (80.47 km/h) | 57.24 mph (92.12 km/h) |
| 55 mph (88.51 km/h) | 62.96 mph (101.33 km/h) |
| 60 mph (96.56 km/h) | 68.69 mph (110.54 km/h) |
| 65 mph (104.61 km/h) | 74.41 mph (119.75 km/h) |
| 70 mph (112.65 km/h) | 80.13 mph (128.96 km/h) |
| 75 mph (120.7 km/h) | 85.86 mph (138.17 km/h) |
| 80 mph (128.75 km/h) | 91.58 mph (147.38 km/h) |
| 85 mph (136.79 km/h) | 97.3 mph (156.6 km/h) |
| 90 mph (144.84 km/h) | 103.03 mph (165.81 km/h) |
| 95 mph (152.89 km/h) | 108.75 mph (175.02 km/h) |
| 100 mph (160.93 km/h) | 114.48 mph (184.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1593 | 1850 | 1993 | 2081 | 2176 | 2243 | 2318 | 2406 | 2528 | 2650 | 2786 | 2894 | 3091 | 3307 | 3477 | 3585 | 3646 | 3870 | 4182 | 4859 |
Better Fuel Economy Factory Ratios Increased Power
