Shimano is now entering the fully wireless gravel market with the GRX RX827, a 1×12-speed Di2 groupset that combines the existing GRX wireless cockpit design with the rear derailleur technology of the XTR M9200 series. Wireless is now slowly becoming the standard, but does that eliminate all the issues with electric and wireless shifting? We'd like to know, of course.
1 | Wireless Di2 system - another step forward?
The RX827 joins Shimano's wireless family, compatible with all 12-speed wireless shifters from road, gravel and even some MTB lines. That means: fresh-packed Di2 experience without cables. Fine for the cockpit enthusiast, but: electronic systems always involve maintenance - think firmware updates, sync issues or dead batteries. If you ride in mud or rain, you need a screen or app to check your battery status anyway. Not something you just fix 'on the go'.
2 | Rear derailleur - clever work
The wireless RD-RX827 shares the robust 'Shadow ES' construction with MTB derailleurs: skid plate, automatic impact recovery, and a low-profile housing. Great for gravel forests, for sure. According to Shimano, they screw off the tooth protector itself on impacts, after which the derailleur resets itself. A clever piece of engineering. Weighing 449g, the derailleur is not the lightest - especially if you want to perform uphill, every gram counts. Installation also requires some extra handling, that part is still not quite 'on par' with competitor SRAM.
3 | 1×12 drivetrain - effective, yet then you think: I'm missing a cog
With a choice of 40T or 42T cranks and a micro-spline 10-51T cassette, the group is widely applicable. Shimano designs this for both light adventurers and, say, bikepackers. And with the new BL-RX825-L shiftless brake handle, you save 19.5g and keep your cockpit clean. Comfortable, sure, and with 1×12 you have a nice range, but still you think: limitations on steep climbs. A compact double often offers more garage capability in tricky passages. If you really want to vary - from sprint to long climb - 1×12 sometimes leaves you just not flexible enough.
4 | Ergonomics & smart shifting
The Di2 buttons on the paddles + hidden inner button remain fine, and additional remote switches can still be fitted. Shimano thus offers the same button layout as with 2×12 versions. Handy and recognisable.
5 | RX180 aluminium wheels - solid alu friends.
The new WH-RX180 wheels are tubeless-ready, 25 mm internally and equipped with interchangeable freehubs for Micro Spline or HG. Weighs 2.1 kg - fine, but not particularly light. Of course, for those aiming for performance, carbon remains the logical step. They are sturdy units, though, and can take a beating.
What we think?
Shimano sets a fine technical calling card with the GRX RX827: wireless simplicity, solid housing, and modular cockpit options. Ideal for tech-interested riders who want a clean cockpit and few cables to pull.
Still, a few minor dings:
- Weight: the setup is a bit heavier, a few hundred grams, compared to competitor SRAM
- Maintenance: Fewer wires is nice, but fewer wires is also more hassle to connect. Every disadvantage has its advantage a great footballer once said.
- Employability: 1×12 does not offer the ultimate range for every mix of gravel, climb and sprint.
Shimano goes along with the trend of less wire and also the 1×12 option. Funny to see, though, that Shimano in particular is leaving the move to 1×13 to the others. What do they know that we don't!
Want to know more about switching groups? Shimano vs Campagnolo vs SRAM: What are the differences?
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