2007年寶馬335i

????可伸縮硬頂在半個世紀里不斷改進，但還是有一些不可避免的缺點——復雜的機械構造，額外的重量，底盤性能降低，行李空間縮小，以及更高的費用。寶馬3系敞篷車是首款擁有三段式可折疊鋁質車頂的寶馬轎車。它比絕大多數車型都更好地處理了上述問題，但也因為需要為車頂騰出空間而無法增加尾箱空間。

2007 BMW 335i.

????Retractable hardtops improved over the intervening half-century, but still required their own compromises -- namely mechanical complexity, extra weight, reduced chassis capability, luggage capacity, and expense. The 3 Series convertible, the first BMW with a three-piece folding aluminum roof, deals with them better than most but can't hike the extra space in the rear needed for top storage.