Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/55-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.64 (854.5) | 32.01 (813) | -1.63 (-41.5) -4.9% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 105.69 (2684.49) | 100.56 (2554.11) | -5.13 (-130.38) -4.9% |
| Sidewall Height inches (mm) | 6.82 (173.25) | 6 (152.5) | -0.82 (-20.75) -12% |
| Revolutions per mile (km) | 599.5 (372.51) | 630.1 (391.52) | 30.6 (19.01) 5.1% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.03 mph (30.62 km/h) |
| 25 mph (40.23 km/h) | 23.79 mph (38.28 km/h) |
| 30 mph (48.28 km/h) | 28.54 mph (45.94 km/h) |
| 35 mph (56.33 km/h) | 33.3 mph (53.59 km/h) |
| 40 mph (64.37 km/h) | 38.06 mph (61.25 km/h) |
| 45 mph (72.42 km/h) | 42.81 mph (68.9 km/h) |
| 50 mph (80.47 km/h) | 47.57 mph (76.56 km/h) |
| 55 mph (88.51 km/h) | 52.33 mph (84.22 km/h) |
| 60 mph (96.56 km/h) | 57.09 mph (91.87 km/h) |
| 65 mph (104.61 km/h) | 61.84 mph (99.53 km/h) |
| 70 mph (112.65 km/h) | 66.6 mph (107.18 km/h) |
| 75 mph (120.7 km/h) | 71.36 mph (114.84 km/h) |
| 80 mph (128.75 km/h) | 76.11 mph (122.49 km/h) |
| 85 mph (136.79 km/h) | 80.87 mph (130.15 km/h) |
| 90 mph (144.84 km/h) | 85.63 mph (137.81 km/h) |
| 95 mph (152.89 km/h) | 90.39 mph (145.46 km/h) |
| 100 mph (160.93 km/h) | 95.14 mph (153.12 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
