Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 330/25-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 28.5 (723.8) | -0.18 (-4.6) -0.6% |
| Width inches (mm) | 12.8 (325) | 12.99 (330) | 0.2 (5) 1.5% |
| Circum. inches (mm) | 90.09 (2288.34) | 89.52 (2273.88) | -0.57 (-14.45) -0.6% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.25 (82.5) | -0.59 (-15) -15.4% |
| Revolutions per mile (km) | 703.28 (437) | 707.75 (439.78) | 4.47 (2.78) 0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.87 mph (31.98 km/h) |
| 25 mph (40.23 km/h) | 24.84 mph (39.98 km/h) |
| 30 mph (48.28 km/h) | 29.81 mph (47.98 km/h) |
| 35 mph (56.33 km/h) | 34.78 mph (55.97 km/h) |
| 40 mph (64.37 km/h) | 39.75 mph (63.97 km/h) |
| 45 mph (72.42 km/h) | 44.72 mph (71.96 km/h) |
| 50 mph (80.47 km/h) | 49.68 mph (79.96 km/h) |
| 55 mph (88.51 km/h) | 54.65 mph (87.96 km/h) |
| 60 mph (96.56 km/h) | 59.62 mph (95.95 km/h) |
| 65 mph (104.61 km/h) | 64.59 mph (103.95 km/h) |
| 70 mph (112.65 km/h) | 69.56 mph (111.94 km/h) |
| 75 mph (120.7 km/h) | 74.53 mph (119.94 km/h) |
| 80 mph (128.75 km/h) | 79.49 mph (127.93 km/h) |
| 85 mph (136.79 km/h) | 84.46 mph (135.93 km/h) |
| 90 mph (144.84 km/h) | 89.43 mph (143.93 km/h) |
| 95 mph (152.89 km/h) | 94.4 mph (151.92 km/h) |
| 100 mph (160.93 km/h) | 99.37 mph (159.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1801 | 2092 | 2253 | 2353 | 2460 | 2537 | 2621 | 2721 | 2859 | 2997 | 3150 | 3273 | 3495 | 3740 | 3932 | 4054 | 4123 | 4376 | 4729 | 5495 |
Better Fuel Economy Factory Ratios Increased Power
