Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 305/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 39.21 (996) | -7.22 (-183.5) -15.6% |
| Width inches (mm) | 15.55 (395) | 12.01 (305) | -3.54 (-90) -22.8% |
| Circum. inches (mm) | 145.89 (3705.51) | 123.19 (3129.03) | -22.7 (-576.48) -15.6% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 9.61 (244) | -3.61 (-91.75) -27.3% |
| Revolutions per mile (km) | 434.31 (269.87) | 514.33 (319.59) | 80.02 (49.72) 18.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.89 mph (27.18 km/h) |
| 25 mph (40.23 km/h) | 21.11 mph (33.97 km/h) |
| 30 mph (48.28 km/h) | 25.33 mph (40.77 km/h) |
| 35 mph (56.33 km/h) | 29.55 mph (47.56 km/h) |
| 40 mph (64.37 km/h) | 33.78 mph (54.36 km/h) |
| 45 mph (72.42 km/h) | 38 mph (61.15 km/h) |
| 50 mph (80.47 km/h) | 42.22 mph (67.95 km/h) |
| 55 mph (88.51 km/h) | 46.44 mph (74.74 km/h) |
| 60 mph (96.56 km/h) | 50.67 mph (81.54 km/h) |
| 65 mph (104.61 km/h) | 54.89 mph (88.33 km/h) |
| 70 mph (112.65 km/h) | 59.11 mph (95.13 km/h) |
| 75 mph (120.7 km/h) | 63.33 mph (101.92 km/h) |
| 80 mph (128.75 km/h) | 67.55 mph (108.72 km/h) |
| 85 mph (136.79 km/h) | 71.78 mph (115.51 km/h) |
| 90 mph (144.84 km/h) | 76 mph (122.31 km/h) |
| 95 mph (152.89 km/h) | 80.22 mph (129.1 km/h) |
| 100 mph (160.93 km/h) | 84.44 mph (135.9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1309 | 1521 | 1637 | 1710 | 1788 | 1844 | 1905 | 1977 | 2077 | 2178 | 2289 | 2378 | 2540 | 2718 | 2857 | 2946 | 2996 | 3180 | 3436 | 3993 |
Better Fuel Economy Factory Ratios Increased Power
