Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 165/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 23.2 (589.2) | -0.35 (-9) -1.5% |
| Width inches (mm) | 9.25 (235) | 6.5 (165) | -2.76 (-70) -29.8% |
| Circum. inches (mm) | 73.99 (1879.3) | 72.88 (1851.03) | -1.11 (-28.27) -1.5% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 2.6 (66) | -0.18 (-4.5) -6.4% |
| Revolutions per mile (km) | 856.35 (532.11) | 869.43 (540.24) | 13.08 (8.13) 1.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.7 mph (31.7 km/h) |
| 25 mph (40.23 km/h) | 24.62 mph (39.63 km/h) |
| 30 mph (48.28 km/h) | 29.55 mph (47.55 km/h) |
| 35 mph (56.33 km/h) | 34.47 mph (55.48 km/h) |
| 40 mph (64.37 km/h) | 39.4 mph (63.41 km/h) |
| 45 mph (72.42 km/h) | 44.32 mph (71.33 km/h) |
| 50 mph (80.47 km/h) | 49.25 mph (79.26 km/h) |
| 55 mph (88.51 km/h) | 54.17 mph (87.18 km/h) |
| 60 mph (96.56 km/h) | 59.1 mph (95.11 km/h) |
| 65 mph (104.61 km/h) | 64.02 mph (103.03 km/h) |
| 70 mph (112.65 km/h) | 68.95 mph (110.96 km/h) |
| 75 mph (120.7 km/h) | 73.87 mph (118.89 km/h) |
| 80 mph (128.75 km/h) | 78.8 mph (126.81 km/h) |
| 85 mph (136.79 km/h) | 83.72 mph (134.74 km/h) |
| 90 mph (144.84 km/h) | 88.65 mph (142.66 km/h) |
| 95 mph (152.89 km/h) | 93.57 mph (150.59 km/h) |
| 100 mph (160.93 km/h) | 98.5 mph (158.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2213 | 2570 | 2768 | 2890 | 3022 | 3116 | 3220 | 3342 | 3512 | 3681 | 3870 | 4020 | 4293 | 4595 | 4830 | 4981 | 5065 | 5376 | 5809 | 6751 |
Better Fuel Economy Factory Ratios Increased Power
