Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 26.98 (685.2) | 0.94 (24) 3.6% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 84.75 (2152.62) | 2.97 (75.4) 3.6% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.49 (114) | 0.47 (12) 11.8% |
| Revolutions per mile (km) | 774.76 (481.41) | 747.62 (464.55) | -27.14 (-16.86) -3.5% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.73 mph (33.36 km/h) |
| 25 mph (40.23 km/h) | 25.91 mph (41.69 km/h) |
| 30 mph (48.28 km/h) | 31.09 mph (50.03 km/h) |
| 35 mph (56.33 km/h) | 36.27 mph (58.37 km/h) |
| 40 mph (64.37 km/h) | 41.45 mph (66.71 km/h) |
| 45 mph (72.42 km/h) | 46.63 mph (75.05 km/h) |
| 50 mph (80.47 km/h) | 51.81 mph (83.39 km/h) |
| 55 mph (88.51 km/h) | 57 mph (91.73 km/h) |
| 60 mph (96.56 km/h) | 62.18 mph (100.07 km/h) |
| 65 mph (104.61 km/h) | 67.36 mph (108.4 km/h) |
| 70 mph (112.65 km/h) | 72.54 mph (116.74 km/h) |
| 75 mph (120.7 km/h) | 77.72 mph (125.08 km/h) |
| 80 mph (128.75 km/h) | 82.9 mph (133.42 km/h) |
| 85 mph (136.79 km/h) | 88.09 mph (141.76 km/h) |
| 90 mph (144.84 km/h) | 93.27 mph (150.1 km/h) |
| 95 mph (152.89 km/h) | 98.45 mph (158.44 km/h) |
| 100 mph (160.93 km/h) | 103.63 mph (166.78 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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