Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 285/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 30.34 (770.7) | 1.12 (28.5) 3.8% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 91.8 (2331.69) | 95.32 (2421.23) | 3.53 (89.54) 3.8% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 6.17 (156.75) | 0.56 (14.25) 10% |
| Revolutions per mile (km) | 690.2 (428.87) | 664.68 (413.01) | -25.52 (-15.86) -3.7% |
285/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.77 mph (33.42 km/h) |
| 25 mph (40.23 km/h) | 25.96 mph (41.78 km/h) |
| 30 mph (48.28 km/h) | 31.15 mph (50.13 km/h) |
| 35 mph (56.33 km/h) | 36.34 mph (58.49 km/h) |
| 40 mph (64.37 km/h) | 41.54 mph (66.85 km/h) |
| 45 mph (72.42 km/h) | 46.73 mph (75.2 km/h) |
| 50 mph (80.47 km/h) | 51.92 mph (83.56 km/h) |
| 55 mph (88.51 km/h) | 57.11 mph (91.91 km/h) |
| 60 mph (96.56 km/h) | 62.3 mph (100.27 km/h) |
| 65 mph (104.61 km/h) | 67.5 mph (108.62 km/h) |
| 70 mph (112.65 km/h) | 72.69 mph (116.98 km/h) |
| 75 mph (120.7 km/h) | 77.88 mph (125.34 km/h) |
| 80 mph (128.75 km/h) | 83.07 mph (133.69 km/h) |
| 85 mph (136.79 km/h) | 88.26 mph (142.05 km/h) |
| 90 mph (144.84 km/h) | 93.46 mph (150.4 km/h) |
| 95 mph (152.89 km/h) | 98.65 mph (158.76 km/h) |
| 100 mph (160.93 km/h) | 103.84 mph (167.11 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1691 | 1965 | 2116 | 2210 | 2311 | 2382 | 2462 | 2555 | 2685 | 2814 | 2958 | 3073 | 3282 | 3513 | 3692 | 3808 | 3872 | 4110 | 4441 | 5161 |
Better Fuel Economy Factory Ratios Increased Power
