Shimano Tiagra RD 4500GS 9 Speed Rear Derailleur. The Shimano Tiagra RD 4500 GS 9 speed rear derailleur is the long cage version which is designed to be utilized on a triple road drivetrain. Providing renowned Shimano precision and durability at a superb price, it's the perfect choice for keeping that 3x9 speed set up going and going. And going.
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