Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/25-21 | 345/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27 (685.9) | 27.79 (705.9) | 0.79 (20) 2.9% |
| Width inches (mm) | 12.01 (305) | 13.58 (345) | 1.57 (40) 13.1% |
| Circum. inches (mm) | 84.84 (2154.82) | 87.31 (2217.65) | 2.47 (62.83) 2.9% |
| Sidewall Height inches (mm) | 3 (76.25) | 3.4 (86.25) | 0.39 (10) 13.1% |
| Revolutions per mile (km) | 746.86 (464.08) | 725.7 (450.93) | -21.16 (-13.15) -2.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.58 mph (33.13 km/h) |
| 25 mph (40.23 km/h) | 25.73 mph (41.41 km/h) |
| 30 mph (48.28 km/h) | 30.87 mph (49.69 km/h) |
| 35 mph (56.33 km/h) | 36.02 mph (57.97 km/h) |
| 40 mph (64.37 km/h) | 41.17 mph (66.25 km/h) |
| 45 mph (72.42 km/h) | 46.31 mph (74.53 km/h) |
| 50 mph (80.47 km/h) | 51.46 mph (82.81 km/h) |
| 55 mph (88.51 km/h) | 56.6 mph (91.1 km/h) |
| 60 mph (96.56 km/h) | 61.75 mph (99.38 km/h) |
| 65 mph (104.61 km/h) | 66.9 mph (107.66 km/h) |
| 70 mph (112.65 km/h) | 72.04 mph (115.94 km/h) |
| 75 mph (120.7 km/h) | 77.19 mph (124.22 km/h) |
| 80 mph (128.75 km/h) | 82.33 mph (132.5 km/h) |
| 85 mph (136.79 km/h) | 87.48 mph (140.78 km/h) |
| 90 mph (144.84 km/h) | 92.62 mph (149.06 km/h) |
| 95 mph (152.89 km/h) | 97.77 mph (157.35 km/h) |
| 100 mph (160.93 km/h) | 102.92 mph (165.63 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
