Shimano RD-CT50 is a rear derailleur designed for use with 6-speed SIS shifting systems. It is compatible with sprockets ranging from 14T to 32T and has a total capacity of 34T. The RD-CT50 features a direct-mount design, which allows for easy installation and precise shifting. It is also compatible with Shimano's SIS index shifting system, which provides smooth and precise shifting performance.

The RD-CT50 is a versatile derailleur that can be used with a variety of different drivetrains. It is a good choice for riders who are looking for a reliable and affordable rear derailleur.