Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/45-16 | 320/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.16 (689.9) | 41.42 (1052) | 14.26 (362.1) 52.5% |
| Width inches (mm) | 12.4 (315) | 12.6 (320) | 0.2 (5) 1.6% |
| Circum. inches (mm) | 85.33 (2167.38) | 130.12 (3304.96) | 44.79 (1137.57) 52.5% |
| Sidewall Height inches (mm) | 5.58 (141.75) | 10.71 (272) | 5.13 (130.25) 91.9% |
| Revolutions per mile (km) | 742.53 (461.38) | 486.95 (302.58) | -255.58 (-158.81) -34.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 30.5 mph (49.08 km/h) |
| 25 mph (40.23 km/h) | 38.12 mph (61.35 km/h) |
| 30 mph (48.28 km/h) | 45.75 mph (73.62 km/h) |
| 35 mph (56.33 km/h) | 53.37 mph (85.89 km/h) |
| 40 mph (64.37 km/h) | 60.99 mph (98.16 km/h) |
| 45 mph (72.42 km/h) | 68.62 mph (110.43 km/h) |
| 50 mph (80.47 km/h) | 76.24 mph (122.7 km/h) |
| 55 mph (88.51 km/h) | 83.87 mph (134.97 km/h) |
| 60 mph (96.56 km/h) | 91.49 mph (147.24 km/h) |
| 65 mph (104.61 km/h) | 99.12 mph (159.51 km/h) |
| 70 mph (112.65 km/h) | 106.74 mph (171.78 km/h) |
| 75 mph (120.7 km/h) | 114.36 mph (184.05 km/h) |
| 80 mph (128.75 km/h) | 121.99 mph (196.32 km/h) |
| 85 mph (136.79 km/h) | 129.61 mph (208.59 km/h) |
| 90 mph (144.84 km/h) | 137.24 mph (220.86 km/h) |
| 95 mph (152.89 km/h) | 144.86 mph (233.13 km/h) |
| 100 mph (160.93 km/h) | 152.49 mph (245.4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1239 | 1440 | 1550 | 1619 | 1693 | 1745 | 1803 | 1872 | 1967 | 2062 | 2167 | 2252 | 2405 | 2573 | 2705 | 2789 | 2837 | 3011 | 3254 | 3781 |
Better Fuel Economy Factory Ratios Increased Power
