- 201
- 12
- 40T
- 36T
Specifications
As listed in the manufacturer's catalog.
General
- Series
- GRX
- Model no.
- RD-RX825
- Color / 1
- Series color
- Rear speeds
- 12
- RD construction / SHIMANO SHADOW RD+
- Yes
- Max. front difference
- 17T
- Total capacity
- 40T
- Fluoric coated link bushings
- 4
- P-axle / Material
- Steel
- Plate body / Material
- GFRP
- Inner link / Material
- GFRP
- Di2 connectivity wired / Di2 shifting
- Yes
- Firmware update by E-TUBE PROJECT
- Yes
- SD50 port (pcs)
- 0
- SD300 port (pcs)
- 1
- SD50 connector (pcs)
- 0
- SD300 connector (pcs)
- 0
- LED for system status
- Yes
- Power supply / Wired
- Yes
- Charging port
- Yes
- Charging cable
- EW-EC300
- Average weight (g)
- 310
- Note * Compatible with a Bluetooth LE cycle computer and smartphone/tablet but not freely open profile. ** Compatible with ANT+ cycle computer but not freely open profile. *** Will be shown only when connected to SHIMANO E-BIKE SYSTEMS bike.
- w/o Bracket spec. available
Applicable derailleur hanger
- SHIMANO ROAD type / Direct attachment (conventional)
- Yes
- SHIMANO ROAD type / Direct mount
- Yes
- UDH standard
- Yes
Low sprocket
- Max.
- 36T
- Min.
- 34T
Top sprocket
- Max.
- 11T
- Min.
- 11T
Pulley
- Guide pulley bearing
- Sealed bearing
- Tension pulley bearing
- Sealed bearing
- Teeth
- 11/13T
- Screws material
- Stainless steel
- Sunken type pulley screw
- Yes
Bracket
- Material
- Aluminum
- Finish
- Painted
B-axle
- Hollow axle
- Yes
- Material
- Stainless steel
B-axle 2
- Hollow axle
- Yes
- Material
- Aluminum
- Finish
- Anodized
Bracket body
- Material
- Aluminum
- Finish
- Painted
Outer link
- Material
- Aluminum
- Finish
- Painted
Outer plate
- Material
- Aluminum
- Finish
- Painted
Inner plate
- Material
- Aluminum
- Finish
- Painted
Stroke adjusting screw
- Material
- Steel
- Finish
- Plated
Di2 connectivity wireless
- Di2 shifting
- Yes
- Bluetooth® LE custom (*) / Adjust mode information
- Yes
- Bluetooth® LE custom (*) / Di2 battery level
- Yes
- Bluetooth® LE custom (*) / Gear position
- Yes
- Bluetooth® LE custom (*) / SHIMANO E-BIKE SYSTEMS data items (***)
- Yes
- Bluetooth® LE custom (*) / Compatible with E-TUBE RIDE
- Yes
- Bluetooth® LE custom (*) / Compatible with E-TUBE PROJECT
- Yes
- ANT private (**) / Adjust mode information
- Yes
- ANT private (**) / Di2 battery level
- Yes
- ANT private (**) / Gear position
- Yes
- ANT private (**) / SHIMANO E-BIKE SYSTEMS data items (***)
- Yes
How spec sheets write it
The most common ways bicycle spec sheets name it, by number of mentions.
-
Shimano GRX RX825 Di2
-
Shimano GRX Di2 RD-RX825 12s
-
GRX RD-RX825-DI2 - (11-36T) Rear Derailleur - 2x12
-
Shimano GRX 825 DI2
-
Shimano GRX825 Di2
-
Shimano GRX Di2 RD-RX825, 12-Speed
-
Shimano GRX Di2 2x12 825
-
Shimano GRX RX825
Bicycles
Published bicycles that use it, newest model years first.
