Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/45-18 | 215/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.62 (650.7) | 24.77 (629.2) | -0.85 (-21.5) -3.3% |
| Width inches (mm) | 8.46 (215) | 8.46 (215) | 0 (0) 0% |
| Circum. inches (mm) | 80.48 (2044.23) | 77.82 (1976.69) | -2.66 (-67.54) -3.3% |
| Sidewall Height inches (mm) | 3.81 (96.75) | 3.39 (86) | -0.42 (-10.75) -11.1% |
| Revolutions per mile (km) | 787.26 (489.18) | 814.16 (505.9) | 26.9 (16.72) 3.4% |
215/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.34 mph (31.12 km/h) |
| 25 mph (40.23 km/h) | 24.17 mph (38.9 km/h) |
| 30 mph (48.28 km/h) | 29.01 mph (46.69 km/h) |
| 35 mph (56.33 km/h) | 33.84 mph (54.47 km/h) |
| 40 mph (64.37 km/h) | 38.68 mph (62.25 km/h) |
| 45 mph (72.42 km/h) | 43.51 mph (70.03 km/h) |
| 50 mph (80.47 km/h) | 48.35 mph (77.81 km/h) |
| 55 mph (88.51 km/h) | 53.18 mph (85.59 km/h) |
| 60 mph (96.56 km/h) | 58.02 mph (93.37 km/h) |
| 65 mph (104.61 km/h) | 62.85 mph (101.15 km/h) |
| 70 mph (112.65 km/h) | 67.69 mph (108.93 km/h) |
| 75 mph (120.7 km/h) | 72.52 mph (116.71 km/h) |
| 80 mph (128.75 km/h) | 77.36 mph (124.49 km/h) |
| 85 mph (136.79 km/h) | 82.19 mph (132.27 km/h) |
| 90 mph (144.84 km/h) | 87.03 mph (140.06 km/h) |
| 95 mph (152.89 km/h) | 91.86 mph (147.84 km/h) |
| 100 mph (160.93 km/h) | 96.7 mph (155.62 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2072 | 2407 | 2592 | 2707 | 2830 | 2918 | 3015 | 3130 | 3289 | 3447 | 3624 | 3765 | 4020 | 4302 | 4523 | 4664 | 4743 | 5034 | 5440 | 6321 |
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