Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 345/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 27.79 (705.9) | 1 (25.5) 3.7% |
| Width inches (mm) | 9.65 (245) | 13.58 (345) | 3.94 (100) 40.8% |
| Circum. inches (mm) | 84.16 (2137.54) | 87.31 (2217.65) | 3.15 (80.11) 3.7% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 3.4 (86.25) | 0.5 (12.75) 17.3% |
| Revolutions per mile (km) | 752.9 (467.83) | 725.7 (450.93) | -27.2 (-16.9) -3.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.75 mph (33.39 km/h) |
| 25 mph (40.23 km/h) | 25.94 mph (41.74 km/h) |
| 30 mph (48.28 km/h) | 31.12 mph (50.09 km/h) |
| 35 mph (56.33 km/h) | 36.31 mph (58.44 km/h) |
| 40 mph (64.37 km/h) | 41.5 mph (66.79 km/h) |
| 45 mph (72.42 km/h) | 46.69 mph (75.13 km/h) |
| 50 mph (80.47 km/h) | 51.87 mph (83.48 km/h) |
| 55 mph (88.51 km/h) | 57.06 mph (91.83 km/h) |
| 60 mph (96.56 km/h) | 62.25 mph (100.18 km/h) |
| 65 mph (104.61 km/h) | 67.44 mph (108.53 km/h) |
| 70 mph (112.65 km/h) | 72.62 mph (116.88 km/h) |
| 75 mph (120.7 km/h) | 77.81 mph (125.22 km/h) |
| 80 mph (128.75 km/h) | 83 mph (133.57 km/h) |
| 85 mph (136.79 km/h) | 88.19 mph (141.92 km/h) |
| 90 mph (144.84 km/h) | 93.37 mph (150.27 km/h) |
| 95 mph (152.89 km/h) | 98.56 mph (158.62 km/h) |
| 100 mph (160.93 km/h) | 103.75 mph (166.97 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1847 | 2145 | 2310 | 2413 | 2523 | 2601 | 2688 | 2790 | 2931 | 3073 | 3230 | 3356 | 3584 | 3835 | 4031 | 4157 | 4228 | 4487 | 4849 | 5635 |
Better Fuel Economy Factory Ratios Increased Power
