Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 325/20-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 27.12 (688.8) | -0.28 (-7.1) -1% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 86.07 (2186.23) | 85.19 (2163.93) | -0.88 (-22.31) -1% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 2.56 (65) | -0.64 (-16.25) -20% |
| Revolutions per mile (km) | 736.13 (457.41) | 743.71 (462.12) | 7.59 (4.71) 1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.8 mph (31.86 km/h) |
| 25 mph (40.23 km/h) | 24.74 mph (39.82 km/h) |
| 30 mph (48.28 km/h) | 29.69 mph (47.79 km/h) |
| 35 mph (56.33 km/h) | 34.64 mph (55.75 km/h) |
| 40 mph (64.37 km/h) | 39.59 mph (63.72 km/h) |
| 45 mph (72.42 km/h) | 44.54 mph (71.68 km/h) |
| 50 mph (80.47 km/h) | 49.49 mph (79.65 km/h) |
| 55 mph (88.51 km/h) | 54.44 mph (87.61 km/h) |
| 60 mph (96.56 km/h) | 59.39 mph (95.58 km/h) |
| 65 mph (104.61 km/h) | 64.34 mph (103.54 km/h) |
| 70 mph (112.65 km/h) | 69.29 mph (111.5 km/h) |
| 75 mph (120.7 km/h) | 74.23 mph (119.47 km/h) |
| 80 mph (128.75 km/h) | 79.18 mph (127.43 km/h) |
| 85 mph (136.79 km/h) | 84.13 mph (135.4 km/h) |
| 90 mph (144.84 km/h) | 89.08 mph (143.36 km/h) |
| 95 mph (152.89 km/h) | 94.03 mph (151.33 km/h) |
| 100 mph (160.93 km/h) | 98.98 mph (159.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1893 | 2199 | 2368 | 2472 | 2585 | 2666 | 2754 | 2859 | 3004 | 3149 | 3310 | 3439 | 3672 | 3930 | 4132 | 4260 | 4333 | 4599 | 4969 | 5774 |
Better Fuel Economy Factory Ratios Increased Power
