Shimano STX Rear Derailleur RD-MC31 1990s Vintage Mountain Bike Component Cyc…

This is a vintage Shimano STX rear derailleur, model RD-MC31, designed for 1990s mountain bike applications. It is a mechanical component intended for restoration projects or bicycle repair. The unit features the classic Shimano STX branding and construction typical of the era.

• Brand: Shimano

• Model: RD-MC31

• Series: STX

• Era: 1990s

This item is in acceptable, used condition. There is a heavy accumulation of grease and debris throughout the mechanism, along with visible oxidation and surface rust on the metal components. The pulley wheels show signs of wear, and there is minor surface scuffing and scraping present on the body of the derailleur.