* Bolt Pattern (PCD): This is the most crucial factor. The 1991 Lincoln Town Car uses a 5x4.5" bolt pattern (also sometimes listed as 5x114.3mm). Any rim you choose *must* have this bolt pattern. Using an incorrect pattern is extremely dangerous.
* Wheel Diameter: Stock sizes typically ranged from 15" to 16". You can likely go slightly larger (e.g., 17" or 18"), but you'll need to check for clearance issues with the suspension, calipers, and fenders. Larger wheels often require modifications or specific tire sizes to avoid rubbing. Going smaller is generally safe, but may alter the appearance.
* Wheel Width: The stock width was likely around 6-7 inches. Wider rims are possible, but again, tire choice and potential rubbing become significant concerns with wider rims.
* Offset: Wheel offset determines how far the wheel's mounting surface sits in relation to the hub mounting face. This is crucial for proper fitment and can affect handling. You'll need to research the factory offset for your specific 1991 Town Car and aim for something similar or within a relatively small range. Incorrect offset can lead to rubbing and potential damage.
* Backspacing: Closely related to offset, backspacing measures the distance from the mounting face to the inside of the rim. Incorrect backspacing can cause the wheel to contact suspension components or the brake calipers.
In short: To find the right rims, you need to find wheels with a 5x4.5" bolt pattern. Start by searching online retailers using these specifications. Be sure to check the diameter, width, offset, and backspacing to ensure proper fitment. If you're unsure, consult a tire shop or automotive specialist who can help you determine safe and compatible options for your 1991 Lincoln Town Car.
