Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 250/40-18 | 280/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.87 (657.2) | 33.43 (849.2) | 7.56 (192) 29.2% |
| Width inches (mm) | 9.84 (250) | 11.02 (280) | 1.18 (30) 12% |
| Circum. inches (mm) | 81.29 (2064.65) | 105.03 (2667.84) | 23.75 (603.19) 29.2% |
| Sidewall Height inches (mm) | 3.94 (100) | 7.72 (196) | 3.78 (96) 96% |
| Revolutions per mile (km) | 779.47 (484.34) | 603.24 (374.83) | -176.24 (-109.51) -22.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.84 mph (41.59 km/h) |
| 25 mph (40.23 km/h) | 32.3 mph (51.99 km/h) |
| 30 mph (48.28 km/h) | 38.76 mph (62.39 km/h) |
| 35 mph (56.33 km/h) | 45.23 mph (72.78 km/h) |
| 40 mph (64.37 km/h) | 51.69 mph (83.18 km/h) |
| 45 mph (72.42 km/h) | 58.15 mph (93.58 km/h) |
| 50 mph (80.47 km/h) | 64.61 mph (103.98 km/h) |
| 55 mph (88.51 km/h) | 71.07 mph (114.37 km/h) |
| 60 mph (96.56 km/h) | 77.53 mph (124.77 km/h) |
| 65 mph (104.61 km/h) | 83.99 mph (135.17 km/h) |
| 70 mph (112.65 km/h) | 90.45 mph (145.57 km/h) |
| 75 mph (120.7 km/h) | 96.91 mph (155.96 km/h) |
| 80 mph (128.75 km/h) | 103.37 mph (166.36 km/h) |
| 85 mph (136.79 km/h) | 109.83 mph (176.76 km/h) |
| 90 mph (144.84 km/h) | 116.29 mph (187.16 km/h) |
| 95 mph (152.89 km/h) | 122.75 mph (197.55 km/h) |
| 100 mph (160.93 km/h) | 129.21 mph (207.95 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1535 | 1783 | 1921 | 2005 | 2097 | 2162 | 2234 | 2319 | 2437 | 2554 | 2685 | 2789 | 2979 | 3188 | 3351 | 3456 | 3514 | 3730 | 4031 | 4684 |
Better Fuel Economy Factory Ratios Increased Power
