Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 28/9-15 | 40/15.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.98 (710.76) | 40.03 (1016.68) | 12.04 (305.92) 43% |
| Width inches (mm) | 9.02 (229) | 15.51 (394) | 6.5 (165) 72.1% |
| Circum. inches (mm) | 87.91 (2232.92) | 125.75 (3193.99) | 37.84 (961.08) 43% |
| Sidewall Height inches (mm) | 6.49 (164.88) | 11.01 (279.74) | 4.52 (114.86) 69.7% |
| Revolutions per mile (km) | 720.74 (447.84) | 503.87 (313.09) | -216.87 (-134.76) -30.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 28.61 mph (46.04 km/h) |
| 25 mph (40.23 km/h) | 35.76 mph (57.55 km/h) |
| 30 mph (48.28 km/h) | 42.91 mph (69.06 km/h) |
| 35 mph (56.33 km/h) | 50.06 mph (80.57 km/h) |
| 40 mph (64.37 km/h) | 57.22 mph (92.08 km/h) |
| 45 mph (72.42 km/h) | 64.37 mph (103.59 km/h) |
| 50 mph (80.47 km/h) | 71.52 mph (115.1 km/h) |
| 55 mph (88.51 km/h) | 78.67 mph (126.61 km/h) |
| 60 mph (96.56 km/h) | 85.82 mph (138.12 km/h) |
| 65 mph (104.61 km/h) | 92.98 mph (149.63 km/h) |
| 70 mph (112.65 km/h) | 100.13 mph (161.14 km/h) |
| 75 mph (120.7 km/h) | 107.28 mph (172.65 km/h) |
| 80 mph (128.75 km/h) | 114.43 mph (184.16 km/h) |
| 85 mph (136.79 km/h) | 121.59 mph (195.67 km/h) |
| 90 mph (144.84 km/h) | 128.74 mph (207.18 km/h) |
| 95 mph (152.89 km/h) | 135.89 mph (218.69 km/h) |
| 100 mph (160.93 km/h) | 143.04 mph (230.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1282 | 1490 | 1604 | 1675 | 1751 | 1806 | 1866 | 1937 | 2035 | 2133 | 2243 | 2330 | 2488 | 2663 | 2799 | 2886 | 2936 | 3116 | 3367 | 3912 |
Better Fuel Economy Factory Ratios Increased Power
