Shimano STX Vintage Rear Derailleur - for parts only | eBay
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
SHIMANO STX SE REAR Bike DERAILLEUR - the Buyer's Guide, 2015
Vintage Shimano STX Rear Derailleur RD-MC31 Long Cage MTB Mountain 1990s Bike | eBay