* Offset: The offset of the wheel is crucial. The wrong offset can cause rubbing against the suspension, brakes, or body of the car. You'll need to find wheels with the correct offset for your Impala's specific year and model.
* Backspacing: Similar to offset, backspacing determines how far the wheel mounts inward. Incorrect backspacing will also lead to rubbing.
* Tire Size: Even with the correct wheel size, the tire diameter (including sidewall height) can affect clearance. A 20-inch rim will likely require a low-profile tire, which might negatively impact ride comfort and potentially cause rubbing.
* Suspension: Lowering the car's suspension might be necessary to accommodate larger wheels and tires, especially if you select larger diameter tires.
In short: You *might* be able to fit 20-inch rims, but you'll need to do significant research to find the correct wheel specifications (offset, backspacing) and tire size to avoid rubbing and ensure a safe fit. Consult a tire professional or use online wheel fitment calculators (many are available by searching "wheel fitment calculator") and input your vehicle's details. They can help determine compatibility. Improperly fitted wheels are unsafe and can damage your car.
