NEW Shimano Tiagra RD-4700-GS Rear Derailleur - 10 Speed, Medium Cage, Silver Type_Hubs Constructed using a 6mm aluminum

Constructed using a 6mm aluminum rod

Includes top plate

Motion sensor automatically activates the lighting

the Saris Mag will do the job

Designed and built especially for single speed bikes

NEW Shimano Tiagra RD-4700-GS Rear Derailleur - 10 Speed, Medium Cage, Silver Type_Hubs Constructed using a 6mm aluminumShimano Tiagra RD 4700 Rear Derailleurs Revised cable pitch offers accurate and long lasting performance Wide link design increases rigidity 11 tooth pulleys for reduced pulley wear and chain noise Rear Derailleur Mount Type: 10x1 Standard Rear Der Shifter Compatibility: Shimano Road Cage Length: Medium Drivetrain Speeds: 10 Color: Silver Chain Wrap Capacity (teeth): 41 Largest Cog: 34