Shimano STX REAR derailleur MC32 overhaul full service clean and Rebuild - YouTube
Replacement for lost guide pulley, Shimano STX 7-speed - Bike Forums
Shimano RD-MC32 STX Long Cage Rear Derailleur
Rear derailleur Shimano STX is just working 3rd or 4th cassette. Shifter is working right. Any idea of what the problem can be & how to fix it? : r/bikewrench