GRX RD-RX825 12-Speed Di2 Rear Derailleur
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Why We Like The Shimano GRX RD-RX825 12-Speed Di2 Rear Derailleur
For fast, reliable shifting during our mixed-terrain riding adventures, Shimano brings us the new GRX RD-RX825 12-Speed Di2 Rear Derailleur, complete with a built-in wireless connectivity unit and charging port for easy operation and recharging. SHIMANO SHADOW RD+ chain stabilization helps prevent chain slap to allow us to continue to shift accurately as we ride over rough terrain, while the switch stabilizer features an ON/OFF switch to match the terrain and ease wheel removal. Compatible with 11-34t and 11-36t 12-speed cassettes, this wireless rear derailleur is ready to be added to our dream gravel setup.
Details
- A 12-speed Di2 rear derailleur optimized for mixed-terrain riding
- Built with a compact design with an integrated wireless unit, charging port, and switch
- Shimano Shadow RD+ minimizes distraction for a quieter drivetrain
- Features a switch stabilizer with an ON/OFF switch to match the type of terrain
- An LED status indicator lets us know when to charge our system
- Chain slap is prevented with an adjustable chain stabilizer
- Top sprocket maximum and minimum of 11t
- Low sprocket maximum of 36t with a minimum of 34t
- Item #SHIU1NC
- Capacity
- 40t
- Cassette Range
- 11-36t
- Gearing
- 12-speed
- Compatibility
- 11-34t and 11-36t 12-speed cassettes
- Claimed Weight
- 310g
- Activity
- gravel
- Manufacturer Warranty
- 2 years
Reviews
Q&A
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Overall Rating
5 based on 1 ratings
Review Summary
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Selecting an option will reload the available reviews on the pageOctober 12, 2025
GRX
- Familiarity:
- I've used it several times
I put the GRX on my twelve speed road bike as it gives me leeway to used it with 11/34 cassette and stop the chain from bouncing on a bumpy road
Originally reviewed on Competitivecyclist.com
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