Pacific's unique approach to folding requires that the Birdy have an asymmetrical structure. Since 2005, the bike has also featured a highly rigid monocoque frame that must be made partially by hand. These two factors effectively limit production to just 10,000 units per year.
因摺疊方式特殊，Birdy 車體結構「不對稱」，2005 年開始更改採「高剛性單體式」車架，許多步驟必須手工打造，無法大量生產，每年 1 萬台幾乎已是極限。