Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.98 (685.2) | 26.66 (677.2) | -0.31 (-8) -1.2% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 84.75 (2152.62) | 83.76 (2127.49) | -0.99 (-25.13) -1.2% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.33 (110) | -0.16 (-4) -3.5% |
| Revolutions per mile (km) | 747.62 (464.55) | 756.45 (470.04) | 8.83 (5.49) 1.2% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.77 mph (31.81 km/h) |
| 25 mph (40.23 km/h) | 24.71 mph (39.76 km/h) |
| 30 mph (48.28 km/h) | 29.65 mph (47.72 km/h) |
| 35 mph (56.33 km/h) | 34.59 mph (55.67 km/h) |
| 40 mph (64.37 km/h) | 39.53 mph (63.62 km/h) |
| 45 mph (72.42 km/h) | 44.47 mph (71.58 km/h) |
| 50 mph (80.47 km/h) | 49.42 mph (79.53 km/h) |
| 55 mph (88.51 km/h) | 54.36 mph (87.48 km/h) |
| 60 mph (96.56 km/h) | 59.3 mph (95.43 km/h) |
| 65 mph (104.61 km/h) | 64.24 mph (103.39 km/h) |
| 70 mph (112.65 km/h) | 69.18 mph (111.34 km/h) |
| 75 mph (120.7 km/h) | 74.12 mph (119.29 km/h) |
| 80 mph (128.75 km/h) | 79.07 mph (127.24 km/h) |
| 85 mph (136.79 km/h) | 84.01 mph (135.2 km/h) |
| 90 mph (144.84 km/h) | 88.95 mph (143.15 km/h) |
| 95 mph (152.89 km/h) | 93.89 mph (151.1 km/h) |
| 100 mph (160.93 km/h) | 98.83 mph (159.06 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
