Shimano GRX RD-RX827-SGS Di2 Wireless Rear Derailleur - 12-Speed, Long Cage, Shadow ES, Black Default:Default but in a lighter-weight and

but in a lighter-weight and thinner 30mm diameter package

Part Number 505109 Color Black Size 24"

2cm (4") Gender unisex Intended User Age 12 years and over Model Year 2026 Weight 2

Frame-specific design – built exclusively for Trek Procaliber and Supercaliber models

Length: 60mm

Shimano GRX RD-RX827-SGS Di2 Wireless Rear Derailleur - 12-Speed, Long Cage, Shadow ES, Black Default:Default but in a lighter-weight andThe Shimano GRX RX827 Di2 Wireless rear derailleur paired with a 10 51t cassette (cassette sold separate) gives riders and racers the speed, range, and robustness to pursue any gravel challenge. With built in automatic impact recovery, an impact deflecting shape, and solid pulleys, this derailleur stands up to hard impacts and still retains its lightning quick shifting performance. Key Features Fully wireless shifting built for rough gravel terrain A