Product Details
Shimano GRX Di2 Rear Derailleur - Wireless, Customisable and Reliable Offroad Shifting
SHIMANO's GRX Di2 12-speed rear derailleur features a built-in wireless connectivity unit and charging port, ensuring fast and reliable shifting for mixed-terrain riding and easy recharging. Integrated SHADOW RD+ technology prevents chain slap and ensures precise shifting even on rough terrain. Thanks to built-in ON/OFF switch, wheel removal is easy too. The RD-RX825 is compatible with 11-34T and 11-36T 12-speed cassettes and supports Full or Semi-Synchronized shift modes, enhancing rider customization.
FEATURES
• Compact design with integrated wireless unit, charging port, and switch
• Fast and reliable shifting on rough terrain
• Adjustable chain stabilizer prevents chain slap
• SHIMANO SHADOW RD+
• Gravel-tuned clutch tension
• Switch stabilizer ON/OFF to match terrain: ON for gravel, OFF for smooth roads
• LED status indicator
• Battery indicator, pairing, adjust mode, etc.
• Top sprocket: Max. 11T/Min. 11T
• Low sprocket: Max. 36T/Min. 34T
• Total capacity: 40T
• Charing cable: EW-EC300
What Sets Alchemy Apart
The best pre-owned bikes
When you buy a pre-owned bike from Alchemy Cycle Trader, you’re getting more than just a great deal. Every bike is roadworthy certified, comes with a 3-month warranty, and includes your first service free - so you can ride away with complete confidence.
Buy with confidence
In-house Active Thermography Carbon Fibre Testing for extra peace of mind on pre-owned bikes.
Learn more about our carbon testing.
Expert Servicing & Ongoing Support
Our professional workshop team is here to keep your bike running at its best long after you’ve taken it home. From routine servicing to performance tuning, our qualified mechanics ensure your ride stays smooth, safe, and ready for every adventure. Whether it’s your first free service or future maintenance, you can count on Alchemy Cycle Trader for trusted support and expert care. Learn more about our workshop services.
