To find the correct tire size for 16-inch rims, you need to know the original tire size on your 15-inch wheels. This information should be found:
* On the tire sidewall: The size is printed on the side of the tire (e.g., P205/65R15).
* In your owner's manual: Your owner's manual will specify the recommended tire size.
* On the driver's side doorjamb: A sticker often lists tire information.
Once you know the original tire size (let's say it's P205/65R15 for example), you'll need to use a tire size calculator to find an equivalent size for a 16-inch rim. This calculator will help you find a tire with a similar overall diameter to avoid speedometer inaccuracies, rubbing issues, and potential problems with your ABS and traction control systems. Many online tire size calculators are available with a simple Google search.
Important Considerations:
* Offset: The wheel offset (how far the mounting surface of the wheel is inset or outset from the centerline of the wheel) is crucial. Incorrect offset can cause rubbing against the suspension, brakes, or bodywork. You'll want to find 16-inch wheels with an offset similar to your original 15-inch wheels.
* Tire Width: While you can slightly increase or decrease tire width, substantial changes can lead to rubbing problems. Stick to widths close to your original tire's width.
* Backspacing: This is related to offset and is important to check for clearance.
In short: It's *possible* to use 16-inch rims, but do your research and use a tire size calculator to determine the proper tire size *and* verify wheel offset and backspacing are compatible with your Grand Am. Improperly chosen wheels and tires can lead to dangerous handling characteristics and damage to your vehicle.
