Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.72 (653.2) | 26.66 (677.2) | 0.94 (24) 3.7% |
| Width inches (mm) | 9.65 (245) | 10.83 (275) | 1.18 (30) 12.2% |
| Circum. inches (mm) | 80.79 (2052.09) | 83.76 (2127.49) | 2.97 (75.4) 3.7% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.33 (110) | 0.47 (12) 12.2% |
| Revolutions per mile (km) | 784.25 (487.31) | 756.45 (470.04) | -27.79 (-17.27) -3.5% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.73 mph (33.37 km/h) |
| 25 mph (40.23 km/h) | 25.92 mph (41.71 km/h) |
| 30 mph (48.28 km/h) | 31.1 mph (50.05 km/h) |
| 35 mph (56.33 km/h) | 36.29 mph (58.4 km/h) |
| 40 mph (64.37 km/h) | 41.47 mph (66.74 km/h) |
| 45 mph (72.42 km/h) | 46.65 mph (75.08 km/h) |
| 50 mph (80.47 km/h) | 51.84 mph (83.42 km/h) |
| 55 mph (88.51 km/h) | 57.02 mph (91.77 km/h) |
| 60 mph (96.56 km/h) | 62.2 mph (100.11 km/h) |
| 65 mph (104.61 km/h) | 67.39 mph (108.45 km/h) |
| 70 mph (112.65 km/h) | 72.57 mph (116.79 km/h) |
| 75 mph (120.7 km/h) | 77.76 mph (125.14 km/h) |
| 80 mph (128.75 km/h) | 82.94 mph (133.48 km/h) |
| 85 mph (136.79 km/h) | 88.12 mph (141.82 km/h) |
| 90 mph (144.84 km/h) | 93.31 mph (150.16 km/h) |
| 95 mph (152.89 km/h) | 98.49 mph (158.51 km/h) |
| 100 mph (160.93 km/h) | 103.67 mph (166.85 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
