Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-15 | 285/45-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.98 (609) | 25.1 (637.5) | 1.12 (28.5) 4.7% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 75.32 (1913.23) | 78.85 (2002.77) | 3.53 (89.54) 4.7% |
| Sidewall Height inches (mm) | 4.49 (114) | 5.05 (128.25) | 0.56 (14.25) 12.5% |
| Revolutions per mile (km) | 841.17 (522.68) | 803.56 (499.31) | -37.61 (-23.37) -4.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.94 mph (33.69 km/h) |
| 25 mph (40.23 km/h) | 26.17 mph (42.12 km/h) |
| 30 mph (48.28 km/h) | 31.4 mph (50.54 km/h) |
| 35 mph (56.33 km/h) | 36.64 mph (58.96 km/h) |
| 40 mph (64.37 km/h) | 41.87 mph (67.39 km/h) |
| 45 mph (72.42 km/h) | 47.11 mph (75.81 km/h) |
| 50 mph (80.47 km/h) | 52.34 mph (84.23 km/h) |
| 55 mph (88.51 km/h) | 57.57 mph (92.66 km/h) |
| 60 mph (96.56 km/h) | 62.81 mph (101.08 km/h) |
| 65 mph (104.61 km/h) | 68.04 mph (109.5 km/h) |
| 70 mph (112.65 km/h) | 73.28 mph (117.93 km/h) |
| 75 mph (120.7 km/h) | 78.51 mph (126.35 km/h) |
| 80 mph (128.75 km/h) | 83.74 mph (134.77 km/h) |
| 85 mph (136.79 km/h) | 88.98 mph (143.2 km/h) |
| 90 mph (144.84 km/h) | 94.21 mph (151.62 km/h) |
| 95 mph (152.89 km/h) | 99.45 mph (160.04 km/h) |
| 100 mph (160.93 km/h) | 104.68 mph (168.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2045 | 2376 | 2558 | 2671 | 2793 | 2880 | 2976 | 3089 | 3246 | 3402 | 3576 | 3716 | 3968 | 4246 | 4464 | 4603 | 4682 | 4969 | 5369 | 6239 |
Better Fuel Economy Factory Ratios Increased Power
