Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 32.01 (813) | 5.81 (147.5) 22.2% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 82.31 (2090.73) | 100.56 (2554.11) | 18.24 (463.38) 22.2% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 6 (152.5) | 2.9 (73.75) 93.7% |
| Revolutions per mile (km) | 769.75 (478.3) | 630.1 (391.52) | -139.65 (-86.78) -18.1% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.43 mph (39.32 km/h) |
| 25 mph (40.23 km/h) | 30.54 mph (49.15 km/h) |
| 30 mph (48.28 km/h) | 36.65 mph (58.98 km/h) |
| 35 mph (56.33 km/h) | 42.76 mph (68.81 km/h) |
| 40 mph (64.37 km/h) | 48.87 mph (78.64 km/h) |
| 45 mph (72.42 km/h) | 54.97 mph (88.47 km/h) |
| 50 mph (80.47 km/h) | 61.08 mph (98.3 km/h) |
| 55 mph (88.51 km/h) | 67.19 mph (108.13 km/h) |
| 60 mph (96.56 km/h) | 73.3 mph (117.96 km/h) |
| 65 mph (104.61 km/h) | 79.41 mph (127.79 km/h) |
| 70 mph (112.65 km/h) | 85.51 mph (137.62 km/h) |
| 75 mph (120.7 km/h) | 91.62 mph (147.45 km/h) |
| 80 mph (128.75 km/h) | 97.73 mph (157.28 km/h) |
| 85 mph (136.79 km/h) | 103.84 mph (167.11 km/h) |
| 90 mph (144.84 km/h) | 109.95 mph (176.94 km/h) |
| 95 mph (152.89 km/h) | 116.06 mph (186.77 km/h) |
| 100 mph (160.93 km/h) | 122.16 mph (196.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1603 | 1863 | 2006 | 2095 | 2190 | 2259 | 2334 | 2422 | 2545 | 2668 | 2804 | 2914 | 3111 | 3330 | 3500 | 3610 | 3671 | 3896 | 4210 | 4892 |
Better Fuel Economy Factory Ratios Increased Power
