Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 345/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 27.79 (705.9) | 0.3 (7.5) 1.1% |
| Width inches (mm) | 10.83 (275) | 13.58 (345) | 2.76 (70) 25.5% |
| Circum. inches (mm) | 86.38 (2194.09) | 87.31 (2217.65) | 0.93 (23.56) 1.1% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 3.4 (86.25) | 0.15 (3.75) 4.5% |
| Revolutions per mile (km) | 733.49 (455.77) | 725.7 (450.93) | -7.79 (-4.84) -1.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.21 mph (32.53 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.67 km/h) |
| 30 mph (48.28 km/h) | 30.32 mph (48.8 km/h) |
| 35 mph (56.33 km/h) | 35.38 mph (56.93 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.07 km/h) |
| 45 mph (72.42 km/h) | 45.48 mph (73.2 km/h) |
| 50 mph (80.47 km/h) | 50.54 mph (81.33 km/h) |
| 55 mph (88.51 km/h) | 55.59 mph (89.46 km/h) |
| 60 mph (96.56 km/h) | 60.64 mph (97.6 km/h) |
| 65 mph (104.61 km/h) | 65.7 mph (105.73 km/h) |
| 70 mph (112.65 km/h) | 70.75 mph (113.86 km/h) |
| 75 mph (120.7 km/h) | 75.81 mph (122 km/h) |
| 80 mph (128.75 km/h) | 80.86 mph (130.13 km/h) |
| 85 mph (136.79 km/h) | 85.91 mph (138.26 km/h) |
| 90 mph (144.84 km/h) | 90.97 mph (146.4 km/h) |
| 95 mph (152.89 km/h) | 96.02 mph (154.53 km/h) |
| 100 mph (160.93 km/h) | 101.07 mph (162.66 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
