Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/30-19 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.15 (689.6) | 26.66 (677.2) | -0.49 (-12.4) -1.8% |
| Width inches (mm) | 13.58 (345) | 10.83 (275) | -2.76 (-70) -20.3% |
| Circum. inches (mm) | 85.29 (2166.44) | 83.76 (2127.49) | -1.53 (-38.96) -1.8% |
| Sidewall Height inches (mm) | 4.07 (103.5) | 4.33 (110) | 0.26 (6.5) 6.3% |
| Revolutions per mile (km) | 742.85 (461.59) | 756.45 (470.04) | 13.6 (8.45) 1.8% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.64 mph (31.61 km/h) |
| 25 mph (40.23 km/h) | 24.55 mph (39.51 km/h) |
| 30 mph (48.28 km/h) | 29.46 mph (47.41 km/h) |
| 35 mph (56.33 km/h) | 34.37 mph (55.31 km/h) |
| 40 mph (64.37 km/h) | 39.28 mph (63.22 km/h) |
| 45 mph (72.42 km/h) | 44.19 mph (71.12 km/h) |
| 50 mph (80.47 km/h) | 49.1 mph (79.02 km/h) |
| 55 mph (88.51 km/h) | 54.01 mph (86.92 km/h) |
| 60 mph (96.56 km/h) | 58.92 mph (94.82 km/h) |
| 65 mph (104.61 km/h) | 63.83 mph (102.73 km/h) |
| 70 mph (112.65 km/h) | 68.74 mph (110.63 km/h) |
| 75 mph (120.7 km/h) | 73.65 mph (118.53 km/h) |
| 80 mph (128.75 km/h) | 78.56 mph (126.43 km/h) |
| 85 mph (136.79 km/h) | 83.47 mph (134.33 km/h) |
| 90 mph (144.84 km/h) | 88.38 mph (142.24 km/h) |
| 95 mph (152.89 km/h) | 93.29 mph (150.14 km/h) |
| 100 mph (160.93 km/h) | 98.2 mph (158.04 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
