Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 405/30-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 33.57 (852.6) | 6.17 (156.7) 22.5% |
| Width inches (mm) | 12.8 (325) | 15.94 (405) | 3.15 (80) 24.6% |
| Circum. inches (mm) | 86.07 (2186.23) | 105.45 (2678.52) | 19.38 (492.29) 22.5% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 4.78 (121.5) | 1.58 (40.25) 49.5% |
| Revolutions per mile (km) | 736.13 (457.41) | 600.83 (373.34) | -135.29 (-84.07) -18.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.5 mph (39.43 km/h) |
| 25 mph (40.23 km/h) | 30.63 mph (49.29 km/h) |
| 30 mph (48.28 km/h) | 36.76 mph (59.15 km/h) |
| 35 mph (56.33 km/h) | 42.88 mph (69.01 km/h) |
| 40 mph (64.37 km/h) | 49.01 mph (78.87 km/h) |
| 45 mph (72.42 km/h) | 55.13 mph (88.73 km/h) |
| 50 mph (80.47 km/h) | 61.26 mph (98.59 km/h) |
| 55 mph (88.51 km/h) | 67.38 mph (108.45 km/h) |
| 60 mph (96.56 km/h) | 73.51 mph (118.3 km/h) |
| 65 mph (104.61 km/h) | 79.64 mph (128.16 km/h) |
| 70 mph (112.65 km/h) | 85.76 mph (138.02 km/h) |
| 75 mph (120.7 km/h) | 91.89 mph (147.88 km/h) |
| 80 mph (128.75 km/h) | 98.01 mph (157.74 km/h) |
| 85 mph (136.79 km/h) | 104.14 mph (167.6 km/h) |
| 90 mph (144.84 km/h) | 110.27 mph (177.46 km/h) |
| 95 mph (152.89 km/h) | 116.39 mph (187.31 km/h) |
| 100 mph (160.93 km/h) | 122.52 mph (197.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1529 | 1776 | 1913 | 1997 | 2089 | 2154 | 2225 | 2310 | 2427 | 2544 | 2674 | 2778 | 2967 | 3175 | 3338 | 3442 | 3500 | 3715 | 4014 | 4665 |
Better Fuel Economy Factory Ratios Increased Power
