Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 26.66 (677.2) | -1.57 (-40) -5.6% |
| Width inches (mm) | 12.8 (325) | 10.83 (275) | -1.97 (-50) -15.4% |
| Circum. inches (mm) | 88.71 (2253.15) | 83.76 (2127.49) | -4.95 (-125.66) -5.6% |
| Sidewall Height inches (mm) | 5.12 (130) | 4.33 (110) | -0.79 (-20) -15.4% |
| Revolutions per mile (km) | 714.26 (443.82) | 756.45 (470.04) | 42.19 (26.22) 5.9% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.88 mph (30.39 km/h) |
| 25 mph (40.23 km/h) | 23.61 mph (37.99 km/h) |
| 30 mph (48.28 km/h) | 28.33 mph (45.59 km/h) |
| 35 mph (56.33 km/h) | 33.05 mph (53.19 km/h) |
| 40 mph (64.37 km/h) | 37.77 mph (60.78 km/h) |
| 45 mph (72.42 km/h) | 42.49 mph (68.38 km/h) |
| 50 mph (80.47 km/h) | 47.21 mph (75.98 km/h) |
| 55 mph (88.51 km/h) | 51.93 mph (83.58 km/h) |
| 60 mph (96.56 km/h) | 56.65 mph (91.18 km/h) |
| 65 mph (104.61 km/h) | 61.37 mph (98.77 km/h) |
| 70 mph (112.65 km/h) | 66.1 mph (106.37 km/h) |
| 75 mph (120.7 km/h) | 70.82 mph (113.97 km/h) |
| 80 mph (128.75 km/h) | 75.54 mph (121.57 km/h) |
| 85 mph (136.79 km/h) | 80.26 mph (129.17 km/h) |
| 90 mph (144.84 km/h) | 84.98 mph (136.76 km/h) |
| 95 mph (152.89 km/h) | 89.7 mph (144.36 km/h) |
| 100 mph (160.93 km/h) | 94.42 mph (151.96 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
