Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/25-21 | 345/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.9) | 27.79 (705.9) | 1.38 (35) 5.2% |
| Width inches (mm) | 10.83 (275) | 13.58 (345) | 2.76 (70) 25.5% |
| Circum. inches (mm) | 82.98 (2107.69) | 87.31 (2217.65) | 4.33 (109.96) 5.2% |
| Sidewall Height inches (mm) | 2.71 (68.75) | 3.4 (86.25) | 0.69 (17.5) 25.5% |
| Revolutions per mile (km) | 763.56 (474.45) | 725.7 (450.93) | -37.86 (-23.52) -5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.04 mph (33.87 km/h) |
| 25 mph (40.23 km/h) | 26.3 mph (42.33 km/h) |
| 30 mph (48.28 km/h) | 31.57 mph (50.8 km/h) |
| 35 mph (56.33 km/h) | 36.83 mph (59.27 km/h) |
| 40 mph (64.37 km/h) | 42.09 mph (67.73 km/h) |
| 45 mph (72.42 km/h) | 47.35 mph (76.2 km/h) |
| 50 mph (80.47 km/h) | 52.61 mph (84.67 km/h) |
| 55 mph (88.51 km/h) | 57.87 mph (93.13 km/h) |
| 60 mph (96.56 km/h) | 63.13 mph (101.6 km/h) |
| 65 mph (104.61 km/h) | 68.39 mph (110.06 km/h) |
| 70 mph (112.65 km/h) | 73.65 mph (118.53 km/h) |
| 75 mph (120.7 km/h) | 78.91 mph (127 km/h) |
| 80 mph (128.75 km/h) | 84.17 mph (135.46 km/h) |
| 85 mph (136.79 km/h) | 89.43 mph (143.93 km/h) |
| 90 mph (144.84 km/h) | 94.7 mph (152.4 km/h) |
| 95 mph (152.89 km/h) | 99.96 mph (160.86 km/h) |
| 100 mph (160.93 km/h) | 105.22 mph (169.33 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
