Believe it or not. In USA it takes at least 1.5 hour to do fix flat tire in a store. So I always use this tool shown in this video to fix a flat tire and the results have been good so far... 信不信由你。在美國,需要至少1.5小時才能在商店中修理輪胎。所以我總是使用這個視頻中顯示的這個工具修復一個爆胎,結果到目前為止一直很好...