Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-20 | 325/20-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.68 (703) | 25.12 (638) | -2.56 (-65) -9.2% |
| Width inches (mm) | 12.8 (325) | 12.8 (325) | 0 (0) 0% |
| Circum. inches (mm) | 86.95 (2208.54) | 78.91 (2004.34) | -8.04 (-204.2) -9.2% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 2.56 (65) | -1.28 (-32.5) -33.3% |
| Revolutions per mile (km) | 728.69 (452.79) | 802.93 (498.92) | 74.24 (46.13) 10.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.15 mph (29.21 km/h) |
| 25 mph (40.23 km/h) | 22.69 mph (36.51 km/h) |
| 30 mph (48.28 km/h) | 27.23 mph (43.82 km/h) |
| 35 mph (56.33 km/h) | 31.76 mph (51.12 km/h) |
| 40 mph (64.37 km/h) | 36.3 mph (58.42 km/h) |
| 45 mph (72.42 km/h) | 40.84 mph (65.72 km/h) |
| 50 mph (80.47 km/h) | 45.38 mph (73.03 km/h) |
| 55 mph (88.51 km/h) | 49.91 mph (80.33 km/h) |
| 60 mph (96.56 km/h) | 54.45 mph (87.63 km/h) |
| 65 mph (104.61 km/h) | 58.99 mph (94.94 km/h) |
| 70 mph (112.65 km/h) | 63.53 mph (102.24 km/h) |
| 75 mph (120.7 km/h) | 68.07 mph (109.54 km/h) |
| 80 mph (128.75 km/h) | 72.6 mph (116.84 km/h) |
| 85 mph (136.79 km/h) | 77.14 mph (124.15 km/h) |
| 90 mph (144.84 km/h) | 81.68 mph (131.45 km/h) |
| 95 mph (152.89 km/h) | 86.22 mph (138.75 km/h) |
| 100 mph (160.93 km/h) | 90.75 mph (146.05 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2043 | 2374 | 2556 | 2669 | 2791 | 2878 | 2974 | 3087 | 3243 | 3400 | 3574 | 3713 | 3965 | 4243 | 4460 | 4600 | 4678 | 4965 | 5365 | 6234 |
Better Fuel Economy Factory Ratios Increased Power
