Shimano GRX ST RX815 Di2 Hydraulic Disc Brakeset Rear sale rear cassettes and derailleurs to Full length zipper rear cassettes and derailleurs to clean your entire drivetrain within seconds No backseat rider needed Anti slip texture and brake lever coating The Shimano GRX ST RX815 11 speed Di2 shift brake lever integrates electronic shifting with improved grip and confidence on chippy surfaces and descents
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