Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-15 | 285/30-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.98 (609) | 23.73 (602.8) | -0.24 (-6.2) -1% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 75.32 (1913.23) | 74.56 (1893.75) | -0.77 (-19.48) -1% |
| Sidewall Height inches (mm) | 4.49 (114) | 3.37 (85.5) | -1.12 (-28.5) -25% |
| Revolutions per mile (km) | 841.17 (522.68) | 849.82 (528.05) | 8.65 (5.38) 1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.8 mph (31.86 km/h) |
| 25 mph (40.23 km/h) | 24.75 mph (39.82 km/h) |
| 30 mph (48.28 km/h) | 29.69 mph (47.79 km/h) |
| 35 mph (56.33 km/h) | 34.64 mph (55.75 km/h) |
| 40 mph (64.37 km/h) | 39.59 mph (63.72 km/h) |
| 45 mph (72.42 km/h) | 44.54 mph (71.68 km/h) |
| 50 mph (80.47 km/h) | 49.49 mph (79.65 km/h) |
| 55 mph (88.51 km/h) | 54.44 mph (87.61 km/h) |
| 60 mph (96.56 km/h) | 59.39 mph (95.58 km/h) |
| 65 mph (104.61 km/h) | 64.34 mph (103.54 km/h) |
| 70 mph (112.65 km/h) | 69.29 mph (111.51 km/h) |
| 75 mph (120.7 km/h) | 74.24 mph (119.47 km/h) |
| 80 mph (128.75 km/h) | 79.19 mph (127.44 km/h) |
| 85 mph (136.79 km/h) | 84.13 mph (135.4 km/h) |
| 90 mph (144.84 km/h) | 89.08 mph (143.37 km/h) |
| 95 mph (152.89 km/h) | 94.03 mph (151.33 km/h) |
| 100 mph (160.93 km/h) | 98.98 mph (159.3 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2163 | 2512 | 2706 | 2825 | 2954 | 3046 | 3147 | 3267 | 3433 | 3598 | 3782 | 3930 | 4196 | 4491 | 4721 | 4868 | 4951 | 5255 | 5678 | 6598 |
Better Fuel Economy Factory Ratios Increased Power
