Rear Derailleur Hanger Chain Tensioner for Folding Bikes, Skeletal Design

This rear derailleur hanger chain tensioner is designed for compact folding bikes. It features a compact pulley-wheel layout and a hanger-style mounting location. The skeletal arm design is made from aluminum alloy, helping to reduce visual bulk while maintaining a simple structure. One end carries a round pulley wheel, and the other end has the hanger-mounting bracket. The unit includes a black pulley assembly and matching mounting hardware. Weight is 110.6 g.