Premium SCHIMBATOR PINIOANE SHIMANO GRX RD-RX825 12 VITEZE SHADOW PLUS 1ST GROUP Negru

The SHIMANO GRX Di2 RD-RX825 2×12-speed rear derailleur for gravel bikes has an integrated chain stabiliser, which ensures quiet, reliable and precise shifting even on the rough surfaces typical of gravel cycling. And if you have long stretches of smooth asphalt ahead of you, the stabiliser can be deactivated at any time using the ON/OFF switch. Thanks to its compatibility with sprockets with up to 36 teeth, the RD-RX825 gravel bike rear derailleur is also suitable for even the toughest climbs.
Gravel cycling is not meant to be overly complicated. The heart and soul of cycling’s drop bar, dirt road discipline is rooted in simplicity, inclusivity, and adventure. No ride is out of bounds. All are welcome to join. Gear should be functional and reliable but need not break the bank. That’s why whether you’re a grizzled gravel cycling veteran or brand new to the road (or trail) less traveled, you’ll appreciate the latest iteration of Shimano’s groundbreaking—and industry-first-gravel-specific GRX component group. Designed to help you get the most from your next unpaved adventure, RX825 delivers top-tier performance without an over-the-top price.
For riders seeking the best of both worlds, the new 2×12 RX825 UNDROPPABLE drivetrain is the choice. Utilizing a gravel-optimized 48/31 or 46/30 front chainring paired with an 11-34 or 11-36 cassette, this setup delivers an ultra-wide gear range so you can spin a comfortable cadence whether cruising the flats, smashing endless dirt road rollers, or tackling a massive backcountry climb.
This setup delivers precise shifting both front and rear and an integrated SHADOW PLUS chain stabilization for ultimate security over bumpy terrain. The gravel-specific 2×12 option maintains tighter rear cassette gear steps, ideal for subtle cadence changes during competitive racing and spirited weekend group rides.
The wireless Di2 offers faster and more precise gear changes on the rear derailleur. The more compact design integrates wireless unit, charging port and function button. Battery level and Bluetooth/ANT pairing status can be checked via bike computer/smartphone/tablet. In addition, the preferred shifting mode can be selected and the information on the adjustment mode can be queried (for adjusting or tuning the rear derailleur).
Triggered by the wireless shift signal of the shift lever, the extremely powerful motor of the SHIMANO GRX rear derailleur performs a shifting operation within a fraction of a second in interaction with the optimised link structure. The rear derailleur is the heart of the Di2 system and combines charging port, LED indicators, adjustment switch and more in one compact package. The flat profile reduces the risk of damage from contacts and falls.
Use: Gravel, Cyclocross Group: GRX Di2 RX825
Model: RD-RX825
Mount: Direct attachment (Conventional)
Technology: Shadow RD+
Gear front: 2-speed
Gear rear: 12-speed
Compatible Chain: 12-speed HG
Max. teeth large sprocket: 36T
Min. teeth large sprocket: 34T
Max. teeth small sprocket: 11T
Min. teeth small sprocket: 11T
Max. Front Difference: 17T
Total Capacity: 40T
Compatible electric wire: EW-SD300
Firmware update by E-tube Project: Yes
E-tube port (pcs): 1
E-tube connector (pcs): 0
Di2 Wireless-Chip: Yes
Weight: approx. 310g (manufacturer information)