Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 40/12.5-20 | 285/80-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 40.03 (1016.8) | 37.95 (964) | -2.08 (-52.8) -5.2% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 125.76 (3194.37) | 119.23 (3028.5) | -6.53 (-165.88) -5.2% |
| Sidewall Height inches (mm) | 10.02 (254.4) | 8.98 (228) | -1.04 (-26.4) -10.4% |
| Revolutions per mile (km) | 503.81 (313.05) | 531.4 (330.2) | 27.59 (17.15) 5.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.96 mph (30.52 km/h) |
| 25 mph (40.23 km/h) | 23.7 mph (38.14 km/h) |
| 30 mph (48.28 km/h) | 28.44 mph (45.77 km/h) |
| 35 mph (56.33 km/h) | 33.18 mph (53.4 km/h) |
| 40 mph (64.37 km/h) | 37.92 mph (61.03 km/h) |
| 45 mph (72.42 km/h) | 42.66 mph (68.66 km/h) |
| 50 mph (80.47 km/h) | 47.4 mph (76.29 km/h) |
| 55 mph (88.51 km/h) | 52.14 mph (83.92 km/h) |
| 60 mph (96.56 km/h) | 56.88 mph (91.55 km/h) |
| 65 mph (104.61 km/h) | 61.62 mph (99.18 km/h) |
| 70 mph (112.65 km/h) | 66.37 mph (106.8 km/h) |
| 75 mph (120.7 km/h) | 71.11 mph (114.43 km/h) |
| 80 mph (128.75 km/h) | 75.85 mph (122.06 km/h) |
| 85 mph (136.79 km/h) | 80.59 mph (129.69 km/h) |
| 90 mph (144.84 km/h) | 85.33 mph (137.32 km/h) |
| 95 mph (152.89 km/h) | 90.07 mph (144.95 km/h) |
| 100 mph (160.93 km/h) | 94.81 mph (152.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1352 | 1571 | 1692 | 1767 | 1847 | 1905 | 1968 | 2043 | 2146 | 2250 | 2365 | 2457 | 2624 | 2808 | 2952 | 3044 | 3096 | 3286 | 3551 | 4126 |
Better Fuel Economy Factory Ratios Increased Power
