Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-18 | 205/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.77 (629.2) | 24.46 (621.2) | -0.31 (-8) -1.3% |
| Width inches (mm) | 8.46 (215) | 8.07 (205) | -0.39 (-10) -4.7% |
| Circum. inches (mm) | 77.82 (1976.69) | 76.83 (1951.56) | -0.99 (-25.13) -1.3% |
| Sidewall Height inches (mm) | 3.39 (86) | 3.23 (82) | -0.16 (-4) -4.7% |
| Revolutions per mile (km) | 814.16 (505.9) | 824.65 (512.41) | 10.49 (6.52) 1.3% |
205/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.75 mph (31.78 km/h) |
| 25 mph (40.23 km/h) | 24.68 mph (39.72 km/h) |
| 30 mph (48.28 km/h) | 29.62 mph (47.67 km/h) |
| 35 mph (56.33 km/h) | 34.55 mph (55.61 km/h) |
| 40 mph (64.37 km/h) | 39.49 mph (63.56 km/h) |
| 45 mph (72.42 km/h) | 44.43 mph (71.5 km/h) |
| 50 mph (80.47 km/h) | 49.36 mph (79.44 km/h) |
| 55 mph (88.51 km/h) | 54.3 mph (87.39 km/h) |
| 60 mph (96.56 km/h) | 59.24 mph (95.33 km/h) |
| 65 mph (104.61 km/h) | 64.17 mph (103.28 km/h) |
| 70 mph (112.65 km/h) | 69.11 mph (111.22 km/h) |
| 75 mph (120.7 km/h) | 74.05 mph (119.17 km/h) |
| 80 mph (128.75 km/h) | 78.98 mph (127.11 km/h) |
| 85 mph (136.79 km/h) | 83.92 mph (135.06 km/h) |
| 90 mph (144.84 km/h) | 88.86 mph (143 km/h) |
| 95 mph (152.89 km/h) | 93.79 mph (150.94 km/h) |
| 100 mph (160.93 km/h) | 98.73 mph (158.89 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 |
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