Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 395/45-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 29 (736.5) | 1.6 (40.6) 5.8% |
| Width inches (mm) | 12.8 (325) | 15.55 (395) | 2.76 (70) 21.5% |
| Circum. inches (mm) | 86.07 (2186.23) | 91.09 (2313.78) | 5.02 (127.55) 5.8% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 7 (177.75) | 3.8 (96.5) 118.8% |
| Revolutions per mile (km) | 736.13 (457.41) | 695.55 (432.19) | -40.58 (-25.21) -5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.17 mph (34.06 km/h) |
| 25 mph (40.23 km/h) | 26.46 mph (42.58 km/h) |
| 30 mph (48.28 km/h) | 31.75 mph (51.1 km/h) |
| 35 mph (56.33 km/h) | 37.04 mph (59.61 km/h) |
| 40 mph (64.37 km/h) | 42.33 mph (68.13 km/h) |
| 45 mph (72.42 km/h) | 47.63 mph (76.65 km/h) |
| 50 mph (80.47 km/h) | 52.92 mph (85.16 km/h) |
| 55 mph (88.51 km/h) | 58.21 mph (93.68 km/h) |
| 60 mph (96.56 km/h) | 63.5 mph (102.19 km/h) |
| 65 mph (104.61 km/h) | 68.79 mph (110.71 km/h) |
| 70 mph (112.65 km/h) | 74.08 mph (119.23 km/h) |
| 75 mph (120.7 km/h) | 79.38 mph (127.74 km/h) |
| 80 mph (128.75 km/h) | 84.67 mph (136.26 km/h) |
| 85 mph (136.79 km/h) | 89.96 mph (144.78 km/h) |
| 90 mph (144.84 km/h) | 95.25 mph (153.29 km/h) |
| 95 mph (152.89 km/h) | 100.54 mph (161.81 km/h) |
| 100 mph (160.93 km/h) | 105.83 mph (170.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1770 | 2056 | 2214 | 2312 | 2418 | 2493 | 2576 | 2674 | 2809 | 2945 | 3096 | 3216 | 3435 | 3676 | 3864 | 3984 | 4052 | 4301 | 4647 | 5400 |
Better Fuel Economy Factory Ratios Increased Power
