Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/55-16 | 205/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.15 (587.9) | 24.46 (621.2) | 1.31 (33.3) 5.7% |
| Width inches (mm) | 6.5 (165) | 8.07 (205) | 1.57 (40) 24.2% |
| Circum. inches (mm) | 72.71 (1846.94) | 76.83 (1951.56) | 4.12 (104.62) 5.7% |
| Sidewall Height inches (mm) | 3.57 (90.75) | 3.23 (82) | -0.34 (-8.75) -9.6% |
| Revolutions per mile (km) | 871.36 (541.43) | 824.65 (512.41) | -46.71 (-29.02) -5.4% |
205/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.13 mph (34.01 km/h) |
| 25 mph (40.23 km/h) | 26.42 mph (42.51 km/h) |
| 30 mph (48.28 km/h) | 31.7 mph (51.02 km/h) |
| 35 mph (56.33 km/h) | 36.98 mph (59.52 km/h) |
| 40 mph (64.37 km/h) | 42.27 mph (68.02 km/h) |
| 45 mph (72.42 km/h) | 47.55 mph (76.52 km/h) |
| 50 mph (80.47 km/h) | 52.83 mph (85.03 km/h) |
| 55 mph (88.51 km/h) | 58.12 mph (93.53 km/h) |
| 60 mph (96.56 km/h) | 63.4 mph (102.03 km/h) |
| 65 mph (104.61 km/h) | 68.68 mph (110.53 km/h) |
| 70 mph (112.65 km/h) | 73.96 mph (119.04 km/h) |
| 75 mph (120.7 km/h) | 79.25 mph (127.54 km/h) |
| 80 mph (128.75 km/h) | 84.53 mph (136.04 km/h) |
| 85 mph (136.79 km/h) | 89.81 mph (144.54 km/h) |
| 90 mph (144.84 km/h) | 95.1 mph (153.05 km/h) |
| 95 mph (152.89 km/h) | 100.38 mph (161.55 km/h) |
| 100 mph (160.93 km/h) | 105.66 mph (170.05 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
