Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-15 | 285/40-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.98 (609) | 25.98 (659.8) | 2 (50.8) 8.3% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 75.32 (1913.23) | 81.61 (2072.82) | 6.28 (159.59) 8.3% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.49 (114) | 0 (0) 0% |
| Revolutions per mile (km) | 841.17 (522.68) | 776.4 (482.43) | -64.76 (-40.24) -7.7% |
285/40-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.67 mph (34.87 km/h) |
| 25 mph (40.23 km/h) | 27.09 mph (43.59 km/h) |
| 30 mph (48.28 km/h) | 32.5 mph (52.31 km/h) |
| 35 mph (56.33 km/h) | 37.92 mph (61.03 km/h) |
| 40 mph (64.37 km/h) | 43.34 mph (69.74 km/h) |
| 45 mph (72.42 km/h) | 48.75 mph (78.46 km/h) |
| 50 mph (80.47 km/h) | 54.17 mph (87.18 km/h) |
| 55 mph (88.51 km/h) | 59.59 mph (95.9 km/h) |
| 60 mph (96.56 km/h) | 65 mph (104.62 km/h) |
| 65 mph (104.61 km/h) | 70.42 mph (113.33 km/h) |
| 70 mph (112.65 km/h) | 75.84 mph (122.05 km/h) |
| 75 mph (120.7 km/h) | 81.26 mph (130.77 km/h) |
| 80 mph (128.75 km/h) | 86.67 mph (139.49 km/h) |
| 85 mph (136.79 km/h) | 92.09 mph (148.21 km/h) |
| 90 mph (144.84 km/h) | 97.51 mph (156.92 km/h) |
| 95 mph (152.89 km/h) | 102.92 mph (165.64 km/h) |
| 100 mph (160.93 km/h) | 108.34 mph (174.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1976 | 2295 | 2472 | 2581 | 2699 | 2783 | 2875 | 2985 | 3136 | 3287 | 3456 | 3590 | 3834 | 4103 | 4313 | 4448 | 4523 | 4801 | 5188 | 6028 |
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