hello everyone. first of all sorry for bad English i have race bicycle and planing to travel though Europe.. planning to visit 6-7 countries. so i am planing for long distance ride. i have build my custom bicycle. i bought old ideal (don't remember model). but i have found a problem my rear derailleur is not working properly. i am planning to change front and rear derailleur front- 2 shift and rear 9-shift. i really don't know which one to buy.