Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 315/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 32.4 (823) | 1.59 (40.5) 5.2% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 96.78 (2458.3) | 101.79 (2585.53) | 5.01 (127.23) 5.2% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 6.2 (157.5) | 0.8 (20.25) 14.8% |
| Revolutions per mile (km) | 654.66 (406.79) | 622.44 (386.77) | -32.22 (-20.02) -4.9% |
315/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.04 mph (33.85 km/h) |
| 25 mph (40.23 km/h) | 26.29 mph (42.32 km/h) |
| 30 mph (48.28 km/h) | 31.55 mph (50.78 km/h) |
| 35 mph (56.33 km/h) | 36.81 mph (59.24 km/h) |
| 40 mph (64.37 km/h) | 42.07 mph (67.71 km/h) |
| 45 mph (72.42 km/h) | 47.33 mph (76.17 km/h) |
| 50 mph (80.47 km/h) | 52.59 mph (84.63 km/h) |
| 55 mph (88.51 km/h) | 57.85 mph (93.1 km/h) |
| 60 mph (96.56 km/h) | 63.11 mph (101.56 km/h) |
| 65 mph (104.61 km/h) | 68.36 mph (110.02 km/h) |
| 70 mph (112.65 km/h) | 73.62 mph (118.48 km/h) |
| 75 mph (120.7 km/h) | 78.88 mph (126.95 km/h) |
| 80 mph (128.75 km/h) | 84.14 mph (135.41 km/h) |
| 85 mph (136.79 km/h) | 89.4 mph (143.87 km/h) |
| 90 mph (144.84 km/h) | 94.66 mph (152.34 km/h) |
| 95 mph (152.89 km/h) | 99.92 mph (160.8 km/h) |
| 100 mph (160.93 km/h) | 105.18 mph (169.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1584 | 1840 | 1982 | 2069 | 2164 | 2231 | 2305 | 2393 | 2514 | 2636 | 2770 | 2878 | 3074 | 3289 | 3458 | 3566 | 3626 | 3849 | 4159 | 4833 |
Better Fuel Economy Factory Ratios Increased Power
