Unfortunately, the specific maximum width is not explicitly stated in the available information. To determine the appropriate width for your sliding door, consider the following factors: Track Length: The 120" (10 feet) track length indicates that it can accommodate a wide opening. Door Weight: Since the track supports up to 60 pounds per door, ensure that your door(s) fall within this weight limit. Door Material: The track is suitable for various materials, including aluminum and other compatible surfaces.