Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.04 (763) | 32.01 (813) | 1.97 (50) 6.6% |
| Width inches (mm) | 10.04 (255) | 12.01 (305) | 1.97 (50) 19.6% |
| Circum. inches (mm) | 94.37 (2397.04) | 100.56 (2554.11) | 6.18 (157.08) 6.6% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 6 (152.5) | 0.98 (25) 19.6% |
| Revolutions per mile (km) | 671.39 (417.18) | 630.1 (391.52) | -41.29 (-25.66) -6.2% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.31 mph (34.3 km/h) |
| 25 mph (40.23 km/h) | 26.64 mph (42.87 km/h) |
| 30 mph (48.28 km/h) | 31.97 mph (51.44 km/h) |
| 35 mph (56.33 km/h) | 37.29 mph (60.02 km/h) |
| 40 mph (64.37 km/h) | 42.62 mph (68.59 km/h) |
| 45 mph (72.42 km/h) | 47.95 mph (77.17 km/h) |
| 50 mph (80.47 km/h) | 53.28 mph (85.74 km/h) |
| 55 mph (88.51 km/h) | 58.6 mph (94.31 km/h) |
| 60 mph (96.56 km/h) | 63.93 mph (102.89 km/h) |
| 65 mph (104.61 km/h) | 69.26 mph (111.46 km/h) |
| 70 mph (112.65 km/h) | 74.59 mph (120.04 km/h) |
| 75 mph (120.7 km/h) | 79.91 mph (128.61 km/h) |
| 80 mph (128.75 km/h) | 85.24 mph (137.18 km/h) |
| 85 mph (136.79 km/h) | 90.57 mph (145.76 km/h) |
| 90 mph (144.84 km/h) | 95.9 mph (154.33 km/h) |
| 95 mph (152.89 km/h) | 101.23 mph (162.91 km/h) |
| 100 mph (160.93 km/h) | 106.55 mph (171.48 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
