Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 395/85-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 46.44 (1179.5) | 6.41 (162.7) 16% |
| Width inches (mm) | 12.52 (318) | 15.55 (395) | 3.03 (77) 24.2% |
| Circum. inches (mm) | 125.76 (3194.37) | 145.89 (3705.51) | 20.12 (511.14) 16% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 13.22 (335.75) | 3.2 (81.35) 32% |
| Revolutions per mile (km) | 503.81 (313.05) | 434.31 (269.87) | -69.49 (-43.18) -13.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.2 mph (37.34 km/h) |
| 25 mph (40.23 km/h) | 29 mph (46.67 km/h) |
| 30 mph (48.28 km/h) | 34.8 mph (56.01 km/h) |
| 35 mph (56.33 km/h) | 40.6 mph (65.34 km/h) |
| 40 mph (64.37 km/h) | 46.4 mph (74.67 km/h) |
| 45 mph (72.42 km/h) | 52.2 mph (84.01 km/h) |
| 50 mph (80.47 km/h) | 58 mph (93.34 km/h) |
| 55 mph (88.51 km/h) | 63.8 mph (102.68 km/h) |
| 60 mph (96.56 km/h) | 69.6 mph (112.01 km/h) |
| 65 mph (104.61 km/h) | 75.4 mph (121.35 km/h) |
| 70 mph (112.65 km/h) | 81.2 mph (130.68 km/h) |
| 75 mph (120.7 km/h) | 87 mph (140.01 km/h) |
| 80 mph (128.75 km/h) | 92.8 mph (149.35 km/h) |
| 85 mph (136.79 km/h) | 98.6 mph (158.68 km/h) |
| 90 mph (144.84 km/h) | 104.4 mph (168.02 km/h) |
| 95 mph (152.89 km/h) | 110.2 mph (177.35 km/h) |
| 100 mph (160.93 km/h) | 116 mph (186.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
