Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/45-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.1 (713.7) | 26.98 (685.2) | -1.12 (-28.5) -4% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 88.27 (2242.15) | 84.75 (2152.62) | -3.53 (-89.54) -4% |
| Sidewall Height inches (mm) | 5.05 (128.25) | 4.49 (114) | -0.56 (-14.25) -11.1% |
| Revolutions per mile (km) | 717.77 (446) | 747.62 (464.55) | 29.85 (18.55) 4.2% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.2 mph (30.9 km/h) |
| 25 mph (40.23 km/h) | 24 mph (38.63 km/h) |
| 30 mph (48.28 km/h) | 28.8 mph (46.35 km/h) |
| 35 mph (56.33 km/h) | 33.6 mph (54.08 km/h) |
| 40 mph (64.37 km/h) | 38.4 mph (61.8 km/h) |
| 45 mph (72.42 km/h) | 43.2 mph (69.53 km/h) |
| 50 mph (80.47 km/h) | 48 mph (77.25 km/h) |
| 55 mph (88.51 km/h) | 52.8 mph (84.98 km/h) |
| 60 mph (96.56 km/h) | 57.6 mph (92.7 km/h) |
| 65 mph (104.61 km/h) | 62.4 mph (100.43 km/h) |
| 70 mph (112.65 km/h) | 67.2 mph (108.16 km/h) |
| 75 mph (120.7 km/h) | 72.01 mph (115.88 km/h) |
| 80 mph (128.75 km/h) | 76.81 mph (123.61 km/h) |
| 85 mph (136.79 km/h) | 81.61 mph (131.33 km/h) |
| 90 mph (144.84 km/h) | 86.41 mph (139.06 km/h) |
| 95 mph (152.89 km/h) | 91.21 mph (146.78 km/h) |
| 100 mph (160.93 km/h) | 96.01 mph (154.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1903 | 2210 | 2380 | 2485 | 2599 | 2680 | 2769 | 2874 | 3020 | 3166 | 3327 | 3457 | 3692 | 3951 | 4153 | 4283 | 4356 | 4623 | 4995 | 5805 |
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