Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/45-18 | 205/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.26 (641.7) | 24.46 (621.2) | -0.81 (-20.5) -3.2% |
| Width inches (mm) | 8.07 (205) | 8.07 (205) | 0 (0) 0% |
| Circum. inches (mm) | 79.37 (2015.96) | 76.83 (1951.56) | -2.54 (-64.4) -3.2% |
| Sidewall Height inches (mm) | 3.63 (92.25) | 3.23 (82) | -0.4 (-10.25) -11.1% |
| Revolutions per mile (km) | 798.3 (496.04) | 824.65 (512.41) | 26.34 (16.37) 3.3% |
205/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.36 mph (31.16 km/h) |
| 25 mph (40.23 km/h) | 24.2 mph (38.95 km/h) |
| 30 mph (48.28 km/h) | 29.04 mph (46.74 km/h) |
| 35 mph (56.33 km/h) | 33.88 mph (54.53 km/h) |
| 40 mph (64.37 km/h) | 38.72 mph (62.32 km/h) |
| 45 mph (72.42 km/h) | 43.56 mph (70.11 km/h) |
| 50 mph (80.47 km/h) | 48.4 mph (77.9 km/h) |
| 55 mph (88.51 km/h) | 53.24 mph (85.69 km/h) |
| 60 mph (96.56 km/h) | 58.08 mph (93.48 km/h) |
| 65 mph (104.61 km/h) | 62.92 mph (101.27 km/h) |
| 70 mph (112.65 km/h) | 67.76 mph (109.06 km/h) |
| 75 mph (120.7 km/h) | 72.6 mph (116.85 km/h) |
| 80 mph (128.75 km/h) | 77.44 mph (124.63 km/h) |
| 85 mph (136.79 km/h) | 82.28 mph (132.42 km/h) |
| 90 mph (144.84 km/h) | 87.12 mph (140.21 km/h) |
| 95 mph (152.89 km/h) | 91.97 mph (148 km/h) |
| 100 mph (160.93 km/h) | 96.81 mph (155.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2099 | 2438 | 2625 | 2742 | 2867 | 2956 | 3054 | 3170 | 3331 | 3492 | 3670 | 3813 | 4072 | 4358 | 4581 | 4724 | 4804 | 5099 | 5510 | 6403 |
Better Fuel Economy Factory Ratios Increased Power
