Shimano GRX RX825 Di2 2 x 12 Speed Groupset

Shimano GRX 825 12-Speed Di2 Groupset Bundle

Next-Generation Gravel Performance

The Shimano GRX 825 12-Speed Di2 Groupset is Shimano's most advanced gravel drivetrain yet — combining lightning-fast electronic shifting, refined ergonomics, and optimized 12-speed gearing for total confidence on any terrain. Designed for riders who live for adventure, this complete GRX Di2 kit delivers unmatched control, reliability, and precision on dirt, tarmac, or trail.

Whether you're bikepacking through rugged backroads or racing gravel events, the GRX 825 Di2 gives you the ultimate balance of speed, comfort, and durability.

Key Features

• 2x12-Speed Di2 Drivetrain – Experience ultra-precise, instant electronic shifting with Shimano's proven Di2 technology.
• Gravel-Tuned Ergonomics – Raised hoods with anti-slip texture and optimized lever shape for secure handling on rough terrain.
• Central Di2 Battery System – The BT-DN300 internal battery provides stable, long-lasting power to both derailleurs with simple charging.
• Wireless Cockpit Design – Clean, cable-free setup for a streamlined aesthetic and reliable performance.
• SHADOW RD+ Rear Derailleur – Enhanced chain stability and quieter operation on bumpy gravel roads.
• HYPERGLIDE+ Technology – Smooth, consistent shifting under load for efficient power transfer across all 12 gears.
• Optimised 48/31T Chainset & 11-36T Cassette – Perfect gearing for climbing, cruising, and everything in between.

Advanced Di2 System

Built on Shimano's evolved Di2 platform, the GRX 825 takes inspiration from DURA-ACE, ULTEGRA, and 105 Di2 groupsets. The internal wiring ensures reliability where it matters most, while the wireless shifters create a clutter-free cockpit. The central internal battery delivers consistent performance on even the longest rides and remains secure across the roughest terrain.

Each lever includes a third programmable Di2 button, allowing full customization and control of shifting, dropper posts, or head units — all from your handlebars.

Included in the Bundle

Technical Specifications

• Drivetrain: 2x12-Speed Electronic Di2
• Gear Range: 48/31T (Front) | 11–36T (Rear)
• Chainline: +2.5mm (Gravel Optimised)
• Brakes: Hydraulic Disc
• Connectivity: Wireless Cockpit / Wired Derailleurs
• Battery: BT-DN300 Internal (3-Port)
• Charging: EW-EC300 Cable

Why Choose Shimano GRX 825 Di2?

• Precision shifting in all conditions — even under heavy load
• Reliable power management with a central Di2 battery system
• Optimized gearing for mixed-terrain riding and endurance events
• Comfortable ergonomics for long days in the saddle
• Streamlined design with fewer cables and junctions

The Shimano GRX 825 12-Speed Di2 Groupset is the ultimate upgrade for gravel, adventure, and endurance bikes. Built for riders who demand performance without compromise, this groupset delivers the smoothest, most reliable shifting experience Shimano has ever created for gravel.

DELIVERY

Delivery to mainland UK addresses are free for orders over £40. Except when you choose delivery to a third party (Click and Collect) there is a charge of £5.95 to cover some of the additional cost the couriers charge for this service. If you choose to collect from Fawkes warehouse there is no shipping charge.

There will an additional charge for deliveries to Highlands and Islands. 

RETURNS TO FAWKES

Whether it’s a jersey that doesn’t fit, or the colour is not quite right, sometimes you’ll need to return items to us.

If an item is 'as new' and has not been used or fitted in any way, you can return it to us by post within 90 days of delivery for a refund. Please ensure that the goods are returned in their original packaging and are in an unused condition.

Please click HERE to print and then complete the returns form and include it inside your parcel.

If you wish you can use our Royal Mail Returns service please follow the instructions on the link below to return your parcel to us.

Royal Mail Returns Service

Please pack the item carefully to avoid damaged during shipping.

Customers need to pay the cost of return delivery unless the item is faulty and this will be deducted from your refund, currently £3.95.

If your have a large item e.g. Child seat, Bike, trailer etc. please contact our customer service team at Guy@fawkes-cycles.co.uk to arrange the best way to return your item, the cost will be deducted from your refund.

You will not receive a refund for the retail value of any free or promotional items you are sent, and you will be charged if they are not returned.

UNWANTED ITEMS

If you change your mind on your purchase, you have a full 90 days to return it for a refund. All Goods must be unused, in a saleable condition and in their original packaging with all labels still attached.

Please pack the item carefully to avoid damaged during shipping.

There are some exclusions to our 90 day returns policy, which are detailed below:

Nutritional products or those with a best before date must be returned within 28 days*

Any customised items such as wheel builds cannot be returned*

GPS systems such as sports watches or cycle computers can only be returned if unregistered*

For hygiene reasons, any intimate garments such as facemasks, underwear and swimsuits can only be returned if the items are faulty.

*Unless faulty

If you wish to return your item for a refund, please follow the returns procedure above.

We try our best to process all refunds within 14 working days. We'll refund your item via your original payment method.

You will not receive a refund for the retail value of any free items you are sent, and Fawkes may charge you for this item if you fail to return it

FAULTY ITEMS

If you feel that your purchase has developed a fault, then please contact us with photographs of the issue before returning any goods - we may be able to solve your problem without you incurring any further inconvenience.

If you find a fault with your item, send it back to us and we'll take a look at it as soon as we can. Items sent back to us will undergo an inspection and it may be necessary to send the item away to the manufacturer to confirm the fault. If we confirm a manufacturing fault, we'll happily replace or refund it.

Please pack the item carefully to avoid damaged during shipping. 

Faulty items should be returned within a reasonable time and in a clean and dry condition. PLEASE NOTE, WE WILL NOT PROCESS DIRTY ITEMS.

Please enclose all your details and a covering note explaining the fault and any other useful details.

We'll try to get back to you within 14 working days of receipt of your parcel, although during busy periods this may take slightly longer.

Your statutory rights are not affected.

We reserve the right to recharge return carriage on items where no fault is identified.

Customer Service Email: Guy@Fawkes-Cycles.co.uk

Please contact us for our Payment & Security policy.