Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 325/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 31.24 (793.4) | 3.25 (82.5) 11.6% |
| Width inches (mm) | 13.98 (355) | 12.8 (325) | -1.18 (-30) -8.5% |
| Circum. inches (mm) | 87.93 (2233.36) | 98.13 (2492.54) | 10.2 (259.18) 11.6% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 5.12 (130) | 1.62 (41.25) 46.5% |
| Revolutions per mile (km) | 720.59 (447.76) | 645.66 (401.2) | -74.93 (-46.56) -10.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.32 mph (35.92 km/h) |
| 25 mph (40.23 km/h) | 27.9 mph (44.9 km/h) |
| 30 mph (48.28 km/h) | 33.48 mph (53.88 km/h) |
| 35 mph (56.33 km/h) | 39.06 mph (62.86 km/h) |
| 40 mph (64.37 km/h) | 44.64 mph (71.84 km/h) |
| 45 mph (72.42 km/h) | 50.22 mph (80.83 km/h) |
| 50 mph (80.47 km/h) | 55.8 mph (89.81 km/h) |
| 55 mph (88.51 km/h) | 61.38 mph (98.79 km/h) |
| 60 mph (96.56 km/h) | 66.96 mph (107.77 km/h) |
| 65 mph (104.61 km/h) | 72.54 mph (116.75 km/h) |
| 70 mph (112.65 km/h) | 78.12 mph (125.73 km/h) |
| 75 mph (120.7 km/h) | 83.7 mph (134.71 km/h) |
| 80 mph (128.75 km/h) | 89.28 mph (143.69 km/h) |
| 85 mph (136.79 km/h) | 94.86 mph (152.67 km/h) |
| 90 mph (144.84 km/h) | 100.44 mph (161.65 km/h) |
| 95 mph (152.89 km/h) | 106.02 mph (170.63 km/h) |
| 100 mph (160.93 km/h) | 111.61 mph (179.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1643 | 1909 | 2056 | 2147 | 2244 | 2314 | 2391 | 2482 | 2608 | 2734 | 2874 | 2986 | 3188 | 3412 | 3587 | 3699 | 3762 | 3992 | 4314 | 5013 |
Better Fuel Economy Factory Ratios Increased Power
