SHIMANO GRX Rear Derailleur (Di2 spec.) RD-RX825 12-speed Direct Mount compatible

Shimano GRX Di2 RD-RX825 Rear Derailleur

A 12-speed GRX Di2 rear derailleur for gravel bikes. Works with wired or wireless Di2 setups, and fits a road-type direct attachment hanger, direct mount or UDH.

SHIMANO SHADOW RD+ chain stabiliser can be switched on or off. On for gravel to stop chain slap, off for smooth roads. An LED shows battery level, pairing and adjust mode. Takes a 34T to 36T low sprocket with an 11T top, 40T total capacity.

Di2 parts need pairing and setup in the E-TUBE app, so it's normally a workshop job. Not sure it fits your bike? Talk to us and we'll check.

Key Features

• 12-speed GRX Di2, wired or wireless
• Switchable SHIMANO SHADOW RD+ stabiliser
• Gravel-tuned clutch tension
• LED status indicator
• Road direct attachment, direct mount or UDH
• Firmware updates via E-TUBE PROJECT

Specifications

• Model: RD-RX825
• Series: GRX
• Speeds: 12
• Chain stabiliser: SHIMANO SHADOW RD+ (on/off switch)
• Top sprocket: 11T
• Low sprocket: 34T to 36T
• Total capacity: 40T
• Max. front chainring difference: 17T
• Pulleys: 11T/13T, sealed bearings
• Mount: Shimano road direct attachment, direct mount, UDH
• Cage plates: Aluminium
• Shifting: Di2, wired and wireless
• Charging cable: EW-EC300
• Weight: 310g (Shimano average)

Specs can change without notice from Shimano.