* Existing Wheel Size: What size wheels are currently on your Windstar? The tire size is directly related to the wheel diameter. You can't just put a bigger tire on a smaller wheel.
* Wheel Offset and Backspacing: The wheel's offset and backspacing determine how far the wheel sits inside the wheel well. A larger tire might rub on the suspension, body, or fender liner if the offset isn't correct.
* Tire Aspect Ratio: This is the ratio of the tire's sidewall height to its width. A lower aspect ratio (e.g., 50 or 45) means a shorter sidewall and a potentially larger overall diameter, but might also lead to rubbing.
* Suspension Modifications: Lifting the suspension can allow for larger tires, but this requires modifications.
To find the largest tire that will fit *your* 2002 Ford Windstar without modification:
1. Check your current tire size: It's usually stamped on the sidewall of your tires (e.g., P225/70R15).
2. Consult online tire size calculators: Many websites allow you to input your current tire size and explore slightly larger options. These calculators can predict changes in overall diameter and circumference. Be cautious, as these are only estimates.
3. Check online forums and communities: Search for "2002 Ford Windstar tire upgrade" or similar terms on forums dedicated to Ford Windstars. Other owners may have experimented and shared their successful (and unsuccessful) experiences.
4. Measure your existing clearance: Visually inspect the space between your tires and the fenders, suspension components, and body. This will give you a better idea of how much larger a tire could potentially fit.
Caution: Fitting tires that are too large can lead to:
* Rubbing: The tires could rub against the fenders, suspension, or other parts of the vehicle, causing damage and potentially affecting handling.
* Speedometer inaccuracies: A larger tire diameter will alter your speedometer's readings.
* Problems with the ABS and traction control systems: These systems rely on accurate wheel speed information.
* Strain on the drivetrain: Larger tires may put additional strain on the axles, transmission, and other components.
Before making any changes, it's best to do thorough research and, if you're unsure, consult a qualified mechanic or tire professional. They can help you determine the largest size that will fit safely and reliably.
