Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/45-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.04 (686.7) | 26.98 (685.2) | -0.06 (-1.5) -0.2% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 84.93 (2157.33) | 84.75 (2152.62) | -0.19 (-4.71) -0.2% |
| Sidewall Height inches (mm) | 4.52 (114.75) | 4.49 (114) | -0.03 (-0.75) -0.7% |
| Revolutions per mile (km) | 745.99 (463.53) | 747.62 (464.55) | 1.63 (1.01) 0.2% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.96 mph (32.12 km/h) |
| 25 mph (40.23 km/h) | 24.95 mph (40.15 km/h) |
| 30 mph (48.28 km/h) | 29.93 mph (48.17 km/h) |
| 35 mph (56.33 km/h) | 34.92 mph (56.2 km/h) |
| 40 mph (64.37 km/h) | 39.91 mph (64.23 km/h) |
| 45 mph (72.42 km/h) | 44.9 mph (72.26 km/h) |
| 50 mph (80.47 km/h) | 49.89 mph (80.29 km/h) |
| 55 mph (88.51 km/h) | 54.88 mph (88.32 km/h) |
| 60 mph (96.56 km/h) | 59.87 mph (96.35 km/h) |
| 65 mph (104.61 km/h) | 64.86 mph (104.38 km/h) |
| 70 mph (112.65 km/h) | 69.85 mph (112.41 km/h) |
| 75 mph (120.7 km/h) | 74.84 mph (120.44 km/h) |
| 80 mph (128.75 km/h) | 79.83 mph (128.47 km/h) |
| 85 mph (136.79 km/h) | 84.81 mph (136.5 km/h) |
| 90 mph (144.84 km/h) | 89.8 mph (144.52 km/h) |
| 95 mph (152.89 km/h) | 94.79 mph (152.55 km/h) |
| 100 mph (160.93 km/h) | 99.78 mph (160.58 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 |
Better Fuel Economy Factory Ratios Increased Power
