Shimano GRX RD-RX825 12-Speed Derailleur 2023 Accurate power measurement (+/- 1%)

Accurate power measurement (+/- 1%) with up to 2200 Watts of resistance

while the geometry features an ultra-low standover that makes it easy for your little ones to fit on and grow with the bike

inner bushing and outer cartridge bearing

because when you are in the start gate

Shimano GRX RD-RX825 12-Speed Derailleur 2023 Accurate power measurement (+/- 1%)Where The Magic Happens The Shimano RX825 Rear Derailleur features Shimano's pioneering Shadow RD+ technology. With its convenient on off switch, Shadow RD+ makes removing the rear wheel easy when turned off. When on, the drivetrain is under additional tension that makes for a quieter ride and more precise shifting. Like on Shimano's road 12 speed Di2 systems, the rear derailleur is also the communication hub of the drivetrain, communicating