Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 345/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 27.79 (705.9) | 0.53 (13.5) 1.9% |
| Width inches (mm) | 10.43 (265) | 13.58 (345) | 3.15 (80) 30.2% |
| Circum. inches (mm) | 85.64 (2175.24) | 87.31 (2217.65) | 1.67 (42.41) 1.9% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 3.4 (86.25) | 0.27 (6.75) 8.5% |
| Revolutions per mile (km) | 739.85 (459.72) | 725.7 (450.93) | -14.15 (-8.79) -1.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.39 mph (32.81 km/h) |
| 25 mph (40.23 km/h) | 25.49 mph (41.02 km/h) |
| 30 mph (48.28 km/h) | 30.58 mph (49.22 km/h) |
| 35 mph (56.33 km/h) | 35.68 mph (57.43 km/h) |
| 40 mph (64.37 km/h) | 40.78 mph (65.63 km/h) |
| 45 mph (72.42 km/h) | 45.88 mph (73.83 km/h) |
| 50 mph (80.47 km/h) | 50.97 mph (82.04 km/h) |
| 55 mph (88.51 km/h) | 56.07 mph (90.24 km/h) |
| 60 mph (96.56 km/h) | 61.17 mph (98.44 km/h) |
| 65 mph (104.61 km/h) | 66.27 mph (106.65 km/h) |
| 70 mph (112.65 km/h) | 71.36 mph (114.85 km/h) |
| 75 mph (120.7 km/h) | 76.46 mph (123.05 km/h) |
| 80 mph (128.75 km/h) | 81.56 mph (131.26 km/h) |
| 85 mph (136.79 km/h) | 86.66 mph (139.46 km/h) |
| 90 mph (144.84 km/h) | 91.75 mph (147.67 km/h) |
| 95 mph (152.89 km/h) | 96.85 mph (155.87 km/h) |
| 100 mph (160.93 km/h) | 101.95 mph (164.07 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
