Shimano Tiagra Rear Derailleur ? RD R4700 (GS, 10-Speed)

The Shimano Tiagra RD-R4700 rear derailleur shifts with a consistently smooth, light action. It is designed for 10-speed road drivetrains, it is offered in short and medium-cage options. The GS (Medium Cage) model works best when paired with 11-28T to 11-32T 10-Speed HG Cassettes and is a great choice for local races, climbs, and training rides.