Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 320/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 35.12 (892) | 4.76 (121) 15.7% |
| Width inches (mm) | 12.8 (325) | 12.6 (320) | -0.2 (-5) -1.5% |
| Circum. inches (mm) | 95.36 (2422.17) | 110.33 (2802.3) | 14.97 (380.13) 15.7% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.56 (192) | -0.12 (-3) -1.5% |
| Revolutions per mile (km) | 664.42 (412.85) | 574.29 (356.85) | -90.13 (-56) -13.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.14 mph (37.24 km/h) |
| 25 mph (40.23 km/h) | 28.92 mph (46.55 km/h) |
| 30 mph (48.28 km/h) | 34.71 mph (55.86 km/h) |
| 35 mph (56.33 km/h) | 40.49 mph (65.17 km/h) |
| 40 mph (64.37 km/h) | 46.28 mph (74.48 km/h) |
| 45 mph (72.42 km/h) | 52.06 mph (83.79 km/h) |
| 50 mph (80.47 km/h) | 57.85 mph (93.1 km/h) |
| 55 mph (88.51 km/h) | 63.63 mph (102.41 km/h) |
| 60 mph (96.56 km/h) | 69.42 mph (111.71 km/h) |
| 65 mph (104.61 km/h) | 75.2 mph (121.02 km/h) |
| 70 mph (112.65 km/h) | 80.99 mph (130.33 km/h) |
| 75 mph (120.7 km/h) | 86.77 mph (139.64 km/h) |
| 80 mph (128.75 km/h) | 92.56 mph (148.95 km/h) |
| 85 mph (136.79 km/h) | 98.34 mph (158.26 km/h) |
| 90 mph (144.84 km/h) | 104.12 mph (167.57 km/h) |
| 95 mph (152.89 km/h) | 109.91 mph (176.88 km/h) |
| 100 mph (160.93 km/h) | 115.69 mph (186.19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1461 | 1698 | 1828 | 1909 | 1996 | 2058 | 2127 | 2208 | 2320 | 2432 | 2556 | 2656 | 2836 | 3035 | 3190 | 3290 | 3346 | 3551 | 3837 | 4459 |
Better Fuel Economy Factory Ratios Increased Power
