Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 26.66 (677.2) | 3.11 (79) 13.2% |
| Width inches (mm) | 9.25 (235) | 10.83 (275) | 1.57 (40) 17% |
| Circum. inches (mm) | 73.99 (1879.3) | 83.76 (2127.49) | 9.77 (248.19) 13.2% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 4.33 (110) | 1.56 (39.5) 56% |
| Revolutions per mile (km) | 856.35 (532.11) | 756.45 (470.04) | -99.9 (-62.07) -11.7% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.64 mph (36.44 km/h) |
| 25 mph (40.23 km/h) | 28.3 mph (45.55 km/h) |
| 30 mph (48.28 km/h) | 33.96 mph (54.66 km/h) |
| 35 mph (56.33 km/h) | 39.62 mph (63.77 km/h) |
| 40 mph (64.37 km/h) | 45.28 mph (72.88 km/h) |
| 45 mph (72.42 km/h) | 50.94 mph (81.98 km/h) |
| 50 mph (80.47 km/h) | 56.6 mph (91.09 km/h) |
| 55 mph (88.51 km/h) | 62.26 mph (100.2 km/h) |
| 60 mph (96.56 km/h) | 67.92 mph (109.31 km/h) |
| 65 mph (104.61 km/h) | 73.58 mph (118.42 km/h) |
| 70 mph (112.65 km/h) | 79.24 mph (127.53 km/h) |
| 75 mph (120.7 km/h) | 84.9 mph (136.64 km/h) |
| 80 mph (128.75 km/h) | 90.57 mph (145.75 km/h) |
| 85 mph (136.79 km/h) | 96.23 mph (154.86 km/h) |
| 90 mph (144.84 km/h) | 101.89 mph (163.97 km/h) |
| 95 mph (152.89 km/h) | 107.55 mph (173.08 km/h) |
| 100 mph (160.93 km/h) | 113.21 mph (182.19 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
