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Shimano Wireless GRX Di2 Launches with MTB Tech & Gravel-Ready Features

Shimano GRX Wireless Ventum GS1 DT
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The long wait is over—Shimano is officially in the fully wireless drop-bar game with the all-new GRX RX827 Di2 1×12 drivetrain. Built on a mix of road and mountain bike technology, this latest GRX setup blends their proven Di2 shifting with the rugged, wireless rear derailleur architecture first seen on the newest version of the Shimano XTR wireless groupset, launched early in the summer.

Shimano GRX Wireless Ventum GS1 rear and cassette
Photos: Jordan Villella/Bikerumor.com

Shimano GRX Wireless

GRX RX827 (or, as the kids call it, GRX wireless) is Shimano’s first fully wireless drop-bar drivetrain. Unlike previous GRX Di2 models that relied on internal wiring, the RX827 system completely cuts the cord. 

Shimano GRX Wireless Ventum GS1 backside

The heart of the system is the new RD-RX827 wireless rear derailleur, which manages shifting duties with a robust, MTB-inspired (take a close look at the new XT wireless) build that includes a skid plate, automatic impact recovery, and SHADOW ES tech for a slim profile and trail-capable toughness.

Shimano GRX Wireless Ventum GS1 edit

What Took So Long?

If you’re wondering what took so long? It was the fact that the GRX Wireless rear derailleur is basically the newly minted Shimano XT wireless rear derailleur (a GR-XT, let’s say). So, let’s say the GRX wireless dropped last year alongside its double brethren, the cat would be out of the bag for the updated (and well-hidden) wireless XTR. Shimano needed to keep that technology a secret for as long as possible, and delaying the launch of GRX wireless was the only option. I wonder what else they’re hiding from us?

GRX derailleir weight wireless

GRX Wireless Derailleur Tech Details:

  • SHADOW ES Profile – Tucks the derailleur out of harm’s way, like the new XTR and XT
  • Automatic Impact Recovery – Hits a rock? It resets itself.
  • Chain Stabilization – A dual spring design maintains high chain tension for improved retention.
  • Sealed Battery – Fully internal, protected, and easy to swap out.
  • Weight: 450g (actual)
GRX_Di2_RX827_Single_Cockpit
Photos: Shimano

New Shimano GRX Levers? Sorta

The levers for the GRX groupset were released with the 12-speed double front chain ring version last year. The levers are excellent, and I love them. They are slightly longer in the body than the last version and have a well-defined bonus button. Plus, the braking sensation (if you can believe it) is actually better, and the lever throw feels amazing. The newest update features a single-only setup, cleaning up the lever body while maintaining the same shape as the version released last year. 

Shimano GRX Wireless Ventum GS1 crankset

GRX Crankset

[In my best Troy McClure voice] “You may remember this Shimano GRX crankset from groupsets such as the Shimano GRX 1×12 mechanical.” That’s not a bad thing; there’s no good reason to redo a crankset that works well. Although it would have been great to see a premium ultra-race crankset, for most, if not all gravel racers, that is the Dura-Ace crankset. Although it’s not officially available in a single-ring option, there are some effective workarounds available.

Shimano GRX wireless groupset
Photos: Shimano

Key Features – Shimano GRX RX827

  • Wireless Di2 Tech – Same quick shifting and customization found on Shimano’s road groupsets, now in a wireless, gravel-tuned package.
  • RD-RX827 Rear Derailleur – 12-speed, long cage, handles 10-51T MTB cassettes. Fully wireless with an internal, removable battery that boasts 700–1,000 km per charge.
  • Crankset Options – 1×12 setup with 40T or 42T rings, paired with 10-51T Micro Spline cassettes.
  • New Brake Lever Option – The BL-RX825-L brake-only lever trims weight and simplifies 1x setups.

Wheelset Launch: RX180 Aluminum Gravel Wheels

What would a groupset be without a wheelset launch? But these aren’t some super-racy wheels; they’re sub-$300 (for the pair) alloy workhorse wheels.

Budget-friendly and built for real-world abuse, these wheels feature a conservative 25mm internal hooked rim width, accommodating tires ranging from 32mm to 50mm. Bonus: The new hub system allows you to switch between Micro Spline and HG L freehub bodies.

  • Wheel Weight: – 2,100g (claimed)
  • Hooked Tubeless Rims
  • Convertible Freehub: Run 10/11/12-speed Shimano cassettes
  • Price: $285 (set), $125 (front), $155 (rear)
Shimano GRX Wireless Ventum GS1 full side

Shimano GRX RX827 Wireless Di2 Prices & Weights

  • Left Brake Lever Kit (BL-RX825 + BR-RX820, 160mm rotor-ready)
    Price: $345.00, Weight: 395g
  • Right Shifter/Brake Kit (ST-RX825 + BR-RX820, 1700mm hose)
    Price: $595.00, Weight: 415g
  • Rotor (RT-CL800, 160mm)
    Price: $70.00 (x2 = $140.00) Weight:169g each (x2 = 338g)
  • Crankset (FC-RX820-1, 170mm, 40T)
    Price: $280.00, Weight: 644g
  • Rear Derailleur (RD-RX827)
    Price: $565.00, Weight: 454g
  • Battery Charger (EC-DN100)
    Price: $45.00, Weight: N/A
  • Battery (BT-DN320)
    Price: $55.00, Weight: 26.5g
  • Cassette (CS-M8200-12, 10-51T)
    Price: $195.00, Weight: 473g
  • Chain (CN-M8100, 138L)
    Price: $62.00, Weight: 252g
Shimano GRX Wireless Ventum GS1 depth

First Impressions: Shimano GRX RX827 Wireless Di2

Roll over to our review here and read our thoughts

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seraph
seraph
1 month ago

So now I want to see a side-by-side comparison between the XT and GRX derailleurs/cassettes.

Jaap
Jaap
1 month ago
Reply to  seraph

The GRX cassette actually has XT printed on it.

Ben
Ben
1 month ago

So you have to pay a $5 premium for the wheelset compared to buying the individual front and rear wheel?! What a scam! 😉

matt
matt
1 month ago
Reply to  Ben

Wheelset MSRP is actually $280 according to Shimano’s b2b.

Alex
Alex
1 month ago

Can you confirm if the 1x left brake still has the top Di2 button? Everyone else seems to say that it doesn’t, which would make sense if the lever has no electronics in it.

Jordan
Jordan
1 month ago
Reply to  Alex

Here’s the word from Shimano: The new Single “no-buttons” lever does not have any Di2 buttons; it’s a brake lever only. However, this system can be paired with the RX825 left shifter to allow for total customization of the 6 available shifter buttons.

gibbon
gibbon
1 month ago

No short cage version for the 9-45t cassette?
Will the xt mech work with the Grx shifter?

gibbon
gibbon
1 month ago

Thanks

nooner
nooner
1 month ago

Yeah, Yeah, but can you stand on it?

Dan
Dan
29 days ago

About a $2,500 upgrade. I’ll be sticking with cables a while longer.

Daniel Gibson
Daniel Gibson
27 days ago

No dropper lever option… meh

One
One
24 days ago

Are the hoods as terrible as they were 10 months ago?

Ves
Ves
23 days ago

….who was such a stupid to write in SRAM patent application ….removable, interchangeable batteries ..WHO WAS THAT?

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