Mechanical Rear Derailleur Metal Derailleur with Pulley Wheel Compact Rear Change Gear Pulley

This mechanical rear derailleur is a replacement or upgrade part for a bike's drivetrain. It guides the chain across the cassette for accurate gear shifting. It features a visible guide pulley and a spring-loaded linkage for consistent chain tension. Built with high-hardness black and silver metal components, it is sturdy. It has a compact articulated body, a standard mounting hole, and adjustment screws for easy installation and tuning.