What is the reason why the rear door glass of the Audi A7 cannot be fully lowered?

[CadenMarie]

Audi A7 rear door glass cannot be fully lowered for the following reasons: 1. Because the rear wheel arches of the car occupy the space of the rear door, making the lower part of the rear door curved. 2. The curved shape results in the rear door being narrower at the bottom and wider at the top, so there is no space in the lower part of the door to accommodate the window glass, leading to the situation where the rear glass cannot be fully lowered. Here is additional information: 1. The rear tires of the Audi A7 are large tires, requiring a large wheel arch. The design of the wheel arch causes the lower part of the rear door panel to narrow significantly. When the rear window glass is lowered, the lower part of the door panel does not have enough space to accommodate the glass, resulting in the window glass not being able to lower completely. 2. To address this issue, a triangular window can be installed on the rear door glass, allowing the rear door window to be fully lowered.