Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.44 (646.2) | 26.66 (677.2) | 1.22 (31) 4.8% |
| Width inches (mm) | 12.4 (315) | 10.83 (275) | -1.57 (-40) -12.7% |
| Circum. inches (mm) | 79.93 (2030.1) | 83.76 (2127.49) | 3.83 (97.39) 4.8% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 4.33 (110) | 0.61 (15.5) 16.4% |
| Revolutions per mile (km) | 792.74 (492.59) | 756.45 (470.04) | -36.29 (-22.55) -4.6% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.96 mph (33.73 km/h) |
| 25 mph (40.23 km/h) | 26.2 mph (42.16 km/h) |
| 30 mph (48.28 km/h) | 31.44 mph (50.6 km/h) |
| 35 mph (56.33 km/h) | 36.68 mph (59.03 km/h) |
| 40 mph (64.37 km/h) | 41.92 mph (67.46 km/h) |
| 45 mph (72.42 km/h) | 47.16 mph (75.89 km/h) |
| 50 mph (80.47 km/h) | 52.4 mph (84.33 km/h) |
| 55 mph (88.51 km/h) | 57.64 mph (92.76 km/h) |
| 60 mph (96.56 km/h) | 62.88 mph (101.19 km/h) |
| 65 mph (104.61 km/h) | 68.12 mph (109.63 km/h) |
| 70 mph (112.65 km/h) | 73.36 mph (118.06 km/h) |
| 75 mph (120.7 km/h) | 78.6 mph (126.49 km/h) |
| 80 mph (128.75 km/h) | 83.84 mph (134.92 km/h) |
| 85 mph (136.79 km/h) | 89.08 mph (143.36 km/h) |
| 90 mph (144.84 km/h) | 94.32 mph (151.79 km/h) |
| 95 mph (152.89 km/h) | 99.56 mph (160.22 km/h) |
| 100 mph (160.93 km/h) | 104.8 mph (168.66 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
