Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 405/25-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 27.97 (710.5) | 0.57 (14.6) 2.1% |
| Width inches (mm) | 12.8 (325) | 15.94 (405) | 3.15 (80) 24.6% |
| Circum. inches (mm) | 86.07 (2186.23) | 87.88 (2232.1) | 1.81 (45.87) 2.1% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 3.99 (101.25) | 0.79 (20) 24.6% |
| Revolutions per mile (km) | 736.13 (457.41) | 721 (448.01) | -15.13 (-9.4) -2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.86 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.08 km/h) |
| 30 mph (48.28 km/h) | 30.63 mph (49.29 km/h) |
| 35 mph (56.33 km/h) | 35.73 mph (57.51 km/h) |
| 40 mph (64.37 km/h) | 40.84 mph (65.72 km/h) |
| 45 mph (72.42 km/h) | 45.94 mph (73.94 km/h) |
| 50 mph (80.47 km/h) | 51.05 mph (82.16 km/h) |
| 55 mph (88.51 km/h) | 56.15 mph (90.37 km/h) |
| 60 mph (96.56 km/h) | 61.26 mph (98.59 km/h) |
| 65 mph (104.61 km/h) | 66.36 mph (106.8 km/h) |
| 70 mph (112.65 km/h) | 71.47 mph (115.02 km/h) |
| 75 mph (120.7 km/h) | 76.57 mph (123.23 km/h) |
| 80 mph (128.75 km/h) | 81.68 mph (131.45 km/h) |
| 85 mph (136.79 km/h) | 86.78 mph (139.66 km/h) |
| 90 mph (144.84 km/h) | 91.89 mph (147.88 km/h) |
| 95 mph (152.89 km/h) | 96.99 mph (156.1 km/h) |
| 100 mph (160.93 km/h) | 102.1 mph (164.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1835 | 2131 | 2295 | 2397 | 2506 | 2584 | 2670 | 2772 | 2912 | 3053 | 3209 | 3334 | 3560 | 3810 | 4005 | 4130 | 4201 | 4458 | 4817 | 5598 |
Better Fuel Economy Factory Ratios Increased Power
