Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 395/85-20 | 34/13-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 46.44 (1179.5) | 34.03 (864.4) | -12.41 (-315.1) -26.7% |
| Width inches (mm) | 15.55 (395) | 12.99 (330) | -2.56 (-65) -16.5% |
| Circum. inches (mm) | 145.89 (3705.51) | 106.91 (2715.59) | -38.97 (-989.92) -26.7% |
| Sidewall Height inches (mm) | 13.22 (335.75) | 7.02 (178.2) | -6.2 (-157.55) -46.9% |
| Revolutions per mile (km) | 434.31 (269.87) | 592.63 (368.24) | 158.32 (98.38) 36.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 14.66 mph (23.59 km/h) |
| 25 mph (40.23 km/h) | 18.32 mph (29.49 km/h) |
| 30 mph (48.28 km/h) | 21.99 mph (35.38 km/h) |
| 35 mph (56.33 km/h) | 25.65 mph (41.28 km/h) |
| 40 mph (64.37 km/h) | 29.31 mph (47.18 km/h) |
| 45 mph (72.42 km/h) | 32.98 mph (53.07 km/h) |
| 50 mph (80.47 km/h) | 36.64 mph (58.97 km/h) |
| 55 mph (88.51 km/h) | 40.31 mph (64.87 km/h) |
| 60 mph (96.56 km/h) | 43.97 mph (70.76 km/h) |
| 65 mph (104.61 km/h) | 47.64 mph (76.66 km/h) |
| 70 mph (112.65 km/h) | 51.3 mph (82.56 km/h) |
| 75 mph (120.7 km/h) | 54.96 mph (88.46 km/h) |
| 80 mph (128.75 km/h) | 58.63 mph (94.35 km/h) |
| 85 mph (136.79 km/h) | 62.29 mph (100.25 km/h) |
| 90 mph (144.84 km/h) | 65.96 mph (106.15 km/h) |
| 95 mph (152.89 km/h) | 69.62 mph (112.04 km/h) |
| 100 mph (160.93 km/h) | 73.29 mph (117.94 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1508 | 1752 | 1887 | 1970 | 2060 | 2124 | 2195 | 2278 | 2394 | 2509 | 2638 | 2740 | 2926 | 3132 | 3292 | 3395 | 3453 | 3664 | 3960 | 4601 |
Better Fuel Economy Factory Ratios Increased Power
