Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.1 (713.7) | 26.66 (677.2) | -1.44 (-36.5) -5.1% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 88.27 (2242.15) | 83.76 (2127.49) | -4.51 (-114.67) -5.1% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 4.33 (110) | -0.72 (-18.25) -14.2% |
| Revolutions per mile (km) | 717.77 (446) | 756.45 (470.04) | 38.69 (24.04) 5.4% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.98 mph (30.54 km/h) |
| 25 mph (40.23 km/h) | 23.72 mph (38.18 km/h) |
| 30 mph (48.28 km/h) | 28.47 mph (45.81 km/h) |
| 35 mph (56.33 km/h) | 33.21 mph (53.45 km/h) |
| 40 mph (64.37 km/h) | 37.95 mph (61.08 km/h) |
| 45 mph (72.42 km/h) | 42.7 mph (68.72 km/h) |
| 50 mph (80.47 km/h) | 47.44 mph (76.35 km/h) |
| 55 mph (88.51 km/h) | 52.19 mph (83.99 km/h) |
| 60 mph (96.56 km/h) | 56.93 mph (91.62 km/h) |
| 65 mph (104.61 km/h) | 61.68 mph (99.26 km/h) |
| 70 mph (112.65 km/h) | 66.42 mph (106.89 km/h) |
| 75 mph (120.7 km/h) | 71.16 mph (114.53 km/h) |
| 80 mph (128.75 km/h) | 75.91 mph (122.16 km/h) |
| 85 mph (136.79 km/h) | 80.65 mph (129.8 km/h) |
| 90 mph (144.84 km/h) | 85.4 mph (137.43 km/h) |
| 95 mph (152.89 km/h) | 90.14 mph (145.07 km/h) |
| 100 mph (160.93 km/h) | 94.89 mph (152.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1925 | 2236 | 2408 | 2515 | 2630 | 2711 | 2802 | 2908 | 3055 | 3203 | 3367 | 3498 | 3735 | 3998 | 4202 | 4333 | 4407 | 4677 | 5054 | 5873 |
Better Fuel Economy Factory Ratios Increased Power
