Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/25-20 | 385/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.5) | 29.09 (739) | 2.3 (58.5) 8.6% |
| Width inches (mm) | 13.58 (345) | 15.16 (385) | 1.57 (40) 11.6% |
| Circum. inches (mm) | 84.17 (2137.85) | 91.4 (2321.64) | 7.24 (183.78) 8.6% |
| Sidewall Height inches (mm) | 3.4 (86.25) | 4.55 (115.5) | 1.15 (29.25) 33.9% |
| Revolutions per mile (km) | 752.78 (467.76) | 693.19 (430.73) | -59.59 (-37.03) -7.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.72 mph (34.95 km/h) |
| 25 mph (40.23 km/h) | 27.15 mph (43.69 km/h) |
| 30 mph (48.28 km/h) | 32.58 mph (52.43 km/h) |
| 35 mph (56.33 km/h) | 38.01 mph (61.17 km/h) |
| 40 mph (64.37 km/h) | 43.44 mph (69.91 km/h) |
| 45 mph (72.42 km/h) | 48.87 mph (78.65 km/h) |
| 50 mph (80.47 km/h) | 54.3 mph (87.38 km/h) |
| 55 mph (88.51 km/h) | 59.73 mph (96.12 km/h) |
| 60 mph (96.56 km/h) | 65.16 mph (104.86 km/h) |
| 65 mph (104.61 km/h) | 70.59 mph (113.6 km/h) |
| 70 mph (112.65 km/h) | 76.02 mph (122.34 km/h) |
| 75 mph (120.7 km/h) | 81.45 mph (131.08 km/h) |
| 80 mph (128.75 km/h) | 86.88 mph (139.82 km/h) |
| 85 mph (136.79 km/h) | 92.31 mph (148.55 km/h) |
| 90 mph (144.84 km/h) | 97.74 mph (157.29 km/h) |
| 95 mph (152.89 km/h) | 103.17 mph (166.03 km/h) |
| 100 mph (160.93 km/h) | 108.6 mph (174.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1764 | 2049 | 2207 | 2305 | 2410 | 2485 | 2567 | 2665 | 2800 | 2935 | 3085 | 3205 | 3423 | 3663 | 3851 | 3971 | 4039 | 4286 | 4632 | 5382 |
Better Fuel Economy Factory Ratios Increased Power
