Shimano GRX RX827 Di2 1x12-Speed Wireless Gravel Groupset

Shimano
Price
Regular price £93600
Regular price £1,73995 Sale price £93600
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The Shimano GRX RX827 Di2 groupset is Shimano's first fully wireless drop-bar groupset. The RD-RX827 rear derailleur carries its own removable battery, so there are no wires anywhere and it fits almost any gravel frame, whether it was built for mechanical or electronic shifting. Paired with GRX RX825 Di2 levers and a 10-51T cassette, it's a simple, rugged 1x12 setup for gravel racing, bikepacking and adventure riding.

GRX RX827 Di2 1x12 at a glance

  • Fully wireless – wireless levers and a self-powered rear derailleur; no internal battery or Di2 wires needed.
  • Huge 1x range – a 10-51T cassette gives climbing gears for loaded bikepacking and enough top end for fast group rides.
  • Built for rough terrain – Shadow design, skid plate, solid pulleys and Automatic Impact Recovery that returns the derailleur to gear after a strike.
  • Gravel ergonomics – ST-RX825 levers with taller hoods and a grippy texture for control on rough descents.
  • Servo Wave hydraulic disc brakes – strong, controlled stopping with light lever effort.

What's in the box

Component Model Notes
Dual control levers (pair) ST-RX825 Wireless Di2 shift / hydraulic brake levers
Disc brake calipers (front & rear) BR-RX820 Hydraulic, flat mount
Rear derailleur RD-RX827 12-speed wireless Di2, Shadow design, 10-51T capacity
Crankset FC-RX820-1 1x; 40, 42, 44 or 46T; 160, 165, 170, 172.5 or 175 mm
Cassette 12-speed Micro Spline 10-51T
Chain CN-M6100 12-speed with quick link
Battery BT-DN320 Removable, fits inside the rear derailleur
Charger EC-DN100 Charger for the BT-DN320 battery

Not included: disc rotors, bottom bracket (see our bottom bracket range) and fitting.

Compatibility

  • Freehub: the 10-51T cassette needs a Shimano Micro Spline freehub body. It will not fit a standard HG road freehub, so check your rear wheel before ordering.
  • Frame: no internal battery or Di2 routing needed, so it suits frames built for mechanical shifting too.
  • Battery life: Shimano quotes 700–1,000 km per charge, depending on how much you shift.
  • Mixing: the RD-RX827 also works with Dura-Ace, Ultegra and 105 12-speed Di2 levers.
  • Want 2x? See the GRX RX825 Di2 2x12 groupset.

Choosing a chainring

Shimano pairs this groupset with 40T or 42T rings as standard. Choose 40T for steep climbing and loaded bikepacking, 42T as an all-rounder, or 44T and 46T for faster gravel racing and more top-end speed.

Frequently asked questions

Is GRX RX827 fully wireless?

Yes. The levers are wireless and the rear derailleur has its own battery, so there are no wires at all.

Will it fit my wheels?

Only if your rear wheel has, or can be converted to, a Shimano Micro Spline freehub. Contact us if you're unsure.

Are rotors included?

No. Rotors are sold separately, so you can choose the size and mounting to suit your wheels.

How long does delivery take?

Groupsets are normally dispatched within 5 working days. Standard UK delivery is free on orders over £200. Contact us before ordering if you need it by a specific date.

Why buy from Eminence Cycle Co.

  • Genuine Shimano components
  • UK-based support from riders who build and race on Di2
  • Free UK delivery over £200 and 14-day returns
Shipping information

SHIPPING POLICY

Shipping Overview

At Eminence Cycle Co., we are committed to providing fast and reliable shipping for all our products. All orders are shipped from the United Kingdom and are subject to the following shipping policies.

Processing & Dispatch Times

• Components, Accessories & Framesets: Dispatched within 5 working days.

• Complete Bikes (Pre-Owned & New): Dispatch may take up to 14 working days to ensure proper assembly and quality checks.

International Shipping & Customs

• Orders shipped outside the UK may be subject to import duties and taxes, which vary by country. These charges are the responsibility of the buyer.

• Eminence Cycle Co. will not be liable for delays or returns due to customs clearance.

• If an item is returned due to customs refusal, a reshipping fee will be applied and sent to the customer prior to resending the item.

Damaged Shipments & Claims

• If a package arrives damaged, it must be reported immediately in writing to info@eminencecycleco.com upon receipt with clear photos and a damage report to initiate a claim.

• Eminence Cycle Co. reserves the right to refuse claims if damages are not reported immediately upon receipt.

For any shipping-related inquiries, please contact our support team before placing your order.

Thank you for choosing Eminence Cycle Co.!

RETURNS

We have a 14-day return policy, which means you have 14 days after receiving your item to request a return. 

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. 

To start a return, you can contact us at jmcyclesltd@gmail.com. 

If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at jmcycles@gmail.com

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like special orders—including custom-built bicycles, non-stock components, and any items specifically ordered at a customer’s request—are non-refundable and non-returnable unless deemed faulty or defective upon arrival.

By placing a special order, you acknowledge and agree that:

• No cancellations, refunds, or exchanges will be accepted once the order has been confirmed and processed.

• Special order items are procured specifically for you and cannot be resold as standard inventory.

• If a special order item arrives damaged or defective, you must notify us immediately, providing clear photographic evidence. We will work with the manufacturer to determine an appropriate resolution, which may include repair or replacement at our discretion.

• Certain Special Order items may be sourced from outside country of purchase and may be shipped directly to client - these items may be subject to import duties which shall be borne by the buyer

This policy does not affect your statutory rights under consumer law.

If you have any questions regarding special orders, please contact us before making a purchase.

We do not accept returns for Pre Owned Bicycles and personal care goods (such as beauty products). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item. 

Unfortunately, we cannot accept returns on sale items or gift cards.

Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at jmcyclesltd@gmail.com

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