Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/25-20 | 305/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.5) | 27.2 (691) | 0.41 (10.5) 1.5% |
| Width inches (mm) | 13.58 (345) | 12.01 (305) | -1.57 (-40) -11.6% |
| Circum. inches (mm) | 84.17 (2137.85) | 85.47 (2170.84) | 1.3 (32.99) 1.5% |
| Sidewall Height inches (mm) | 3.4 (86.25) | 3.6 (91.5) | 0.21 (5.25) 6.1% |
| Revolutions per mile (km) | 752.78 (467.76) | 741.35 (460.65) | -11.44 (-7.11) -1.5% |
305/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.31 mph (32.68 km/h) |
| 25 mph (40.23 km/h) | 25.39 mph (40.85 km/h) |
| 30 mph (48.28 km/h) | 30.46 mph (49.03 km/h) |
| 35 mph (56.33 km/h) | 35.54 mph (57.2 km/h) |
| 40 mph (64.37 km/h) | 40.62 mph (65.37 km/h) |
| 45 mph (72.42 km/h) | 45.69 mph (73.54 km/h) |
| 50 mph (80.47 km/h) | 50.77 mph (81.71 km/h) |
| 55 mph (88.51 km/h) | 55.85 mph (89.88 km/h) |
| 60 mph (96.56 km/h) | 60.93 mph (98.05 km/h) |
| 65 mph (104.61 km/h) | 66 mph (106.22 km/h) |
| 70 mph (112.65 km/h) | 71.08 mph (114.39 km/h) |
| 75 mph (120.7 km/h) | 76.16 mph (122.56 km/h) |
| 80 mph (128.75 km/h) | 81.23 mph (130.73 km/h) |
| 85 mph (136.79 km/h) | 86.31 mph (138.91 km/h) |
| 90 mph (144.84 km/h) | 91.39 mph (147.08 km/h) |
| 95 mph (152.89 km/h) | 96.47 mph (155.25 km/h) |
| 100 mph (160.93 km/h) | 101.54 mph (163.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1887 | 2192 | 2360 | 2465 | 2577 | 2657 | 2746 | 2850 | 2994 | 3139 | 3300 | 3428 | 3661 | 3918 | 4118 | 4247 | 4319 | 4584 | 4953 | 5756 |
Better Fuel Economy Factory Ratios Increased Power
