Shimano’s next Dura-Ace group is back in the leak cycle, and this one gives us a better look at what may be coming for the top-tier road group.
The latest round comes from images posted on the Weight Weenies forum, reportedly tied to wireless certification filings. Shimano hasn’t announced Dura-Ace R9300 yet, so treat this as leak territory, because we know it’s coming. Still, the pieces are starting to look pretty real.
The apparent highlights: 13 speeds, semi-wireless Di2, a revised shifter layout, a new rear-derailleur electronics package, and a much different crank and power-meter setup.
So no, this does not look like Shimano throwing everything out and starting over. It looks more like Shimano tightening the current Dura-Ace formula and changing the parts that needed attention. Hopefully that means a much easier-to-live-with power meter install.
The Wire Is Still There
The big question around R9300 has been whether Shimano would finally go fully wireless on the roadside. Based on the leaked images and what has been spotted at the Vuelta, probably not.
The rear derailleur electronics appear to show a wire port, which points to the same basic architecture as current Dura-Ace Di2: wireless shifters, derailleurs wired to a central internal battery.
There is also what appears to be a new charging connection in a similar location to the current Dura-Ace rear derailleur. If that is the charging port, the rearranged contacts make it seem like it will require a completely new charging cable. Curiously, the contacts are now arranged in a square similarly to the contacts on the wireless Di2 batteries used in the MTB & GRX derailleurs, but the spacing and placement seem off if it were to be battery-related.
That will annoy some riders. SRAM is fully wireless. Campagnolo has gone wireless at the top end. Shimano now has fully wireless tech elsewhere in the family. But Dura-Ace road still seems to stick with the hidden-battery setup.
Is that boring? Maybe. Is it totally a Shimano thing? Yeah. Shimano is known for dependability and consistency. However, I trust their lead on this. Lots of riders will be bummed if 13-speed Dura-Ace still has wires, but Shimano is playing the long game, with long battery life.
The Crank May Be the Real News
The crank is where this leak gets more interesting.
The images appear to show a direct-mount chainring interface, which would be a major change for Dura-Ace. Shimano has leaned on its familiar bonded alloy crank architecture for years, with the spider built into the drive-side arm. A direct-mount setup would separate the ring/spider interface from the arm and give Shimano more room to rethink the system.
That matters for two reasons. First, direct-mount could open the door to cleaner chainring swaps and potentially more drivetrain options down the road.
Second, Shimano’s Dura-Ace power meter needs a reset. The current version has taken plenty of heat for accuracy, especially when stacked against dedicated aftermarket units. A new crank architecture gives Shimano a chance to fix that reputation instead of bolting sensors onto a layout that was never truly built around power measurement from the start.
At Dura-Ace money, the power meter cannot be the compromise part or have parts that break after a few installs.
What’s Next?
This leak makes Dura-Ace R9300 seem closer to prime time and hopefully ride time.
The likely 13-speed move is expected and pretty much confirmed. The semi-wireless setup will split opinions. Shimano may have done the most meaningful work on the crank and power meter.
That is probably the right place to focus, and it was the glaring downfall of the R9200 groupset. Shimano already shifts exceptionally well. The bigger questions are power meter accuracy, drivetrain compatibility, charging, cassette options, and whether the new setup gives riders enough reason to move on from R9200.
For now, this is still a leak, a very specific one, but it’s chumming the waters, and we’re here for it. But between the Vuelta sightings and the latest forum images, Shimano’s next Dura-Ace is starting to feel less like rumor and more like a launch waiting for the lights to come on.
