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Shimano GRX Di2 RD-RX825 Rear Derailleur
shimano grx di2 rd-rx825

SHIMANO GRX Di2 RD-RX825 Rear Derailleur

$594.99

SHIMANO GRX Di2 RD-RX825 Rear Derailleur delivers fast, reliable 12-speed electronic shifting with wireless connectivity and adjustable chain stabilizer.

In stock

Free standard shipping Canada-wide over $100
30-day returns on eligible unused items
Ships from Guelph, Ontario

Decision guidance

Is this right for you?

Best For

Ideal for gravel and mixed-terrain cyclists who demand reliable, fast shifting and customizable performance on rough roads and trails.

Why We'd Choose It

Choose the GRX Di2 RD-RX825 for its integrated wireless connectivity, SHADOW RD+ technology, and adjustable chain stabilizer that together deliver smooth, dependable shifting tailored to varying terrain conditions.

At a glance

Product facts

Use
Gravel and mixed-terrain cycling
Key feature
Wireless unit with charging port and adjustable chain stabilizer
Product Story

Product details

Integrated Wireless Connectivity

The SHIMANO GRX Di2 RD-RX825 rear derailleur features a compact design with an integrated wireless unit and charging port, ensuring seamless connectivity and easy recharging.

Reliable Performance on Rough Terrain

Equipped with SHADOW RD+ technology, this derailleur offers fast and reliable shifting, while the adjustable chain stabilizer prevents chain slap, making it ideal for mixed-terrain riding.

Customizable Shifting Modes

Compatible with 11-34T and 11-36T 12-speed cassettes, the RD-RX825 supports Full or Semi-Synchronized shift modes, allowing for enhanced rider customization.

  • Compact design with integrated wireless unit, charging port, and switch
  • 12-speed electronic shifting
  • Adjustable chain stabilizer with ON/OFF switch to match terrain
  • LED status indicator for battery, pairing, and adjust modes
  • Top sprocket compatibility: Max. 11T/Min. 11T
  • Low sprocket compatibility: Max. 36T/Min. 34T

Key Specs

Specifications

Speeds 12-speed Supports 12-speed cassettes
Top Sprocket Compatibility Max. 11T / Min. 11T Compatible with 11T top sprockets
Low Sprocket Compatibility Max. 36T / Min. 34T Compatible with 34-36T low sprockets
Technology SHIMANO SHADOW RD+ Provides stable chain retention and shifting
Questions & answers

Common questions

What type of shifting does the GRX Di2 RD-RX825 support?

It supports fast and reliable 12-speed electronic shifting with Full or Semi-Synchronized shift modes.

Does the derailleur have wireless connectivity?

Yes, it features an integrated wireless unit with a charging port for seamless connectivity and easy recharging.

Can the chain stabilizer be adjusted for different terrains?

Yes, the chain stabilizer has an ON/OFF switch to match terrain: ON for gravel and OFF for smooth roads.

What is the sprocket size compatibility?

It is compatible with top sprockets of max 11T and min 11T, and low sprockets of max 36T and min 34T.

Delivery & Returns

What to expect

Shipping

Free standard Canada-wide shipping over $100 before tax.

Returns

45-day returns for eligible unused items.

Ships from

Ships from Guelph, Ontario
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