Over 2,000,000 Million Customers Served!!!

Need Help? Click the Live Chat to Talk to a Gearhead 💪

Enjoy Free Shipping on Orders Over $75 – Available Within the Lower 48 States!

Load image into Gallery viewer, Shimano-GRX-RD-RX825-Di2-Rear-Derailleur-Long-Cage-12-Speed-Rear-Derailleur-RRDR0475-Bicycle-Rear-Derailleur
Load image into Gallery viewer, Shimano GRX RD-RX825 Di2 Rear Derailleur - 12-Speed, Long Cage, With Clutch, For 2x, Black
Load image into Gallery viewer, Shimano GRX RD-RX825 Di2 Rear Derailleur - 12-Speed, Long Cage, With Clutch, For 2x, Black
Load image into Gallery viewer, Shimano GRX RD-RX825 Di2 Rear Derailleur - 12-Speed, Long Cage, With Clutch, For 2x, Black

SKU: RRDR0475

Shimano GRX RX825 Di2 12-Speed Rear Derailleur with Wireless Connectivity, Long Cage, Shimano Shadow RD+ Technology, Gravel-Tuned Clutch, Electronic Shifting for Mixed Terrain, Black

Regular price $445.00
$494.95 Sale price $445.00 Regular price
Sale Sold out
Unit price
/per 
Save 10%
  • Free Shipping Over $75
  • 30 Day Returns
  • Satisfaction Guaranteed!

$10 Gift Card

at 250 points

$25 Gift Card

at 500 points

$75 Gift Card

at 1,000 points

This is a pre order item. We will ship it when it comes in stock.

$10 Gift Card

at 250 points

$25 Gift Card

at 500 points

$75 Gift Card

at 1,000 points

Description
Specifications

Experience Precision, Durability, and Cutting-Edge Technology with the Shimano GRX RD-RX825 Di2 12-Speed Rear Derailleur

Elevate your gravel, cyclocross, or mixed-terrain riding with the Shimano GRX RD-RX825 Di2 Rear Derailleur. Built for performance and reliability, this high-performance, long cage derailleur is engineered to deliver seamless, fast, and precise gear shifts every time. Its durable materials and innovative design make it the ideal choice for serious cyclists seeking a dependable component that excels across varied terrains.

Materials & Construction

Constructed with premium aluminum and high-strength composite materials, the Shimano GRX RX825 offers exceptional durability and lightweight performance. Its rugged black finish not only enhances aesthetics but also provides corrosion resistance for rugged, long-distance riding conditions.

Performance & Engineering

Featuring Shimano's advanced Shadow RD+ technology, this derailleur minimizes chain slap, resulting in a quieter drivetrain and reduced risk of chain drops-especially critical on rough, uneven terrains. The integrated clutch system, with gravel-tuned tension, provides optimal chain stabilization, and an easy-to-use ON/OFF switch allows riders to adapt tension based on trail conditions, ensuring maximum control whether you're on gravel, dirt, or paved roads.

Components & Technology

- Wireless Connectivity & Charging: Built-in wireless unit and dedicated charging port simplify setup and maintenance, reducing cable clutter.

- 12-Speed Compatibility: Designed to support 11-34t or 11-36t cassettes, compatible with Shimano Road Di2 systems for precise, electronic shifting.

- Adjustable Clutch & Stabilizer: Ensures reliable chain retention and reduces noise during rough terrain rides.

- Synchronized Shift Modes: Supports Full or Semi-Synchronized shifting modes for personalized riding experience.

- LED Indicator: Easy-to-read battery and mode status updates, ensuring you're always informed during rides.

Style & Use Case

With a sleek black finish and robust construction, the Shimano GRX RD-RX825 is tailored for gravel riders, cyclocross racers, and adventure cyclists who demand performance under challenging conditions. Its long cage design is optimized for 2x drivetrain setups, offering a total capacity of 40 teeth for versatile gear ranges. Whether tackling technical trails, high-mileage gravel roads, or mixed-surface adventures, this derailleur delivers smooth, reliable shifting and improved drivetrain stability.

Innovative & Differentiating Features

- Wireless & Rechargeable Technology: Embraces the future of bicycle components with seamless connectivity and eco-friendly recharging.

- Dynamic Gravel-Tuned Clutch: Switchable tension system allows quick terrain adaptation-essential for off-road and mixed-terrain cycling.

- Noise Reduction & Chain Control: Shimano Shadow RD+ technology ensures quiet operation and minimizes chain drops in rough conditions.

- Battery Status & Mode Indicators: LED display enhances user experience with real-time system feedback.

Upgrade your bike's drivetrain with the Shimano GRX RD-RX825 Di2 Rear Derailleur-designed for riders who demand precision, durability, and innovative technology for optimal performance across all terrains. Maximize your riding potential and enjoy reliable electronic shifting that keeps you focused on the adventure ahead.

  • Wireless Connectivity and Charging: Features built-in Shimano Di2 wireless module and USB charging port for seamless updates and maintenance, ensuring your drivetrain stays reliable and up-to-date during extended rides.
  • Exceptional Performance on Rough Terrain: Equipped with Shimano Shadow RD+ technology and integrated clutch, this derailleur delivers precise, smooth shifting while reducing chain slap and drops on challenging gravel and mountain trails.
  • Versatile Compatibility and Range: Supports 12-speed Shimano Road Di2 systems with a wide gear range (11-34t/36t cassettes) and a durable Long Cage design, ideal for mixed-terrain cycling and demanding riding conditions.
  • Innovative Gravel-Tuned Clutch System: Adjustable clutch tension with On/Off switch optimizes chain retention for gravel, trail, or road riding, providing customizable performance and reducing maintenance for dirt, mud, and dust environments.
  • Sleek, Durable Construction with Smart Features: Crafted in a sleek black finish using high-quality materials, complemented by LED status indicators for battery life and pairing status, making it a reliable choice for serious bike enthusiasts and professional riders.
Largest Cog36
Rear Der/Shifter CompatibilityShimano Road Di2
Rear Derailleur Mount Type10x1 Standard
Rear Derailleur Mount TypeShimano Rear Direct Mount
Drivetrain Speeds12
Chain Wrap Capacity (teeth)40
Cage LengthLong
ColorBlack
Shipping
Returns
About Us
Contact Us

We pride ourselves on our ability to ship and deliver your gear with excessive speed! We ship from 22 locations throughout the United States and most orders will arrive in 3 days or less with Free Shipping on orders over $75!

The nitty gritty, for specific delivery timelines please pay attention to the delivery timelines on the product pages and the time frame estimated in the carts. If you need a part by a specific day, please contact us by chat, phone, or

Chat

Talk with a representative

Start Chat

Email

info@365cycles.com

Send Email

Phone

603-968-5797

Call Now

Most orders placed during the workweek before 1:00 PM Eastern time ship the same day, but during peak/holiday season or depending on inventory location handling time can take up to 48 hours. If you have questions regarding shipping estimates, don't hesitate to get in touch with us before placing the order. There is a direct signature requirement for all orders over $500.

We provide the you the ability to utilize multiple shipping & billing addresses, based upon what fits your current needs. However you are responsible to maintain and update any new address changes, as 365 Cycles will not be held liable for orders being shipped to an incorrect address.

  • Our Mistake: If we messed it up you can rest assured we are going to make it right. Contact us by email, phone, or chat and we will make your head spin with how quick we fix it
  • Warranty: We are an authorized retailer for everything we sell, so rest assured your product is covered under the manufacturer's warranty. Contact Us if you are having an issue and we will make sure you are taken care of
  • Just don't want it anymore: We have a 30-day return policy for orders within the US. We offer refunds on returned items that are brand new and in their undamaged, original packaging. Customers are responsible for the cost of return shipping. Damaged, installed, and used items as well as those without original packaging are not eligible for returns. If it's returned in this condition it may be denied and sent back to you

If you need to return your order please email us at info@365cycles.com, call us at 603-968-5797, or use the live chat on our site.

Chat

Talk with a representative

Start Chat

Email

info@365cycles.com

Send Email

Phone

603-968-5797

Call Now

*Please allow up to 3 business days for us to process your return*

365 Cycles puts the customer above everything. Our number one goal is your satisfaction. When you press the shift lever you want the gears to shift, and when you buy bicycle parts, you want the bicycle parts to arrive on time in new condition. With over 60,000 products and 22 warehouse locations throughout the country, we have the parts you need and they are coming in hot!

Living an active lifestyle is just that, a lifestyle that never goes away and our goal is to always exceed your expectations so we can take this lifelong journey together. We strive to have the parts you need, at competitive prices with unmatched shipping speeds!

If there is ever an issue with an order we will work at warp speed to fix our mistake and make sure you never go a day without a bicycle! If you are not receiving the quality of service you need from one of our exceptionally qualified bicycle experts, tell them Ben Berman told you to tell them "Customer Loyalty" and then name your terms.

Our team is waiting to help you 7 days a week and they are more qualified to help than I am but if you ever feel like you're not getting the service you need I’m personally asking you to email me at ben@365cycles.com with "CUSTOMER LOYALTY" in the title and I will personally handle your order.

Over the years we have served millions of satisfied customers and continue to serve many of them today. With your feedback, we are confident we can take this lifelong journey together and build a friendship that goes beyond parts and accessories.

“If you want to go fast, go alone, if you want to go far, go together.” -Someone Smart

Ben Berman Founder & CEO of 365 Cycles


Company Core Values: 

These were established by the members of our team and we use them every week to call out team members who have shined in one of these areas. Feel free to let us know at info@365cycles.com if someone you worked with has gone above and beyond in one of these areas. 

Customer Loyalty

Put yourself in their shoes and support those who support us.

You Control the Outcome

If it is to be, it’s up to me" You are personally responsible for controlling the outcome.

Seek Understanding

Understanding the answer is more important than the answer.

Progress Not Perfection

Pick a direction, analyze the results, and be willing to change course.

Will to Win

Customers, 365 Team, Partners, all need the will to win. Bring the Will to Win to every conversion.

Keep Moving

Move the body, move the mind, and remove any hurdles to achieving an active lifestyle.

Do the Right Thing:

Doing the right thing is more important than doing the thing right.

Stronger together:

If you want to go fast, go alone, if you want to go far, go together. Get your team involved and become stronger together.

Chat

Talk with a representative

Start Chat

Email

info@365cycles.com

Send Email

Phone

603-968-5797

Call Now

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)