And it’s a doozy.

You’ve seen spy shots, heard rumors, and might have even seen the official teaser (which more or less gave it away with the site aptly named www.duraace.com).

But yes, Shimano announced their new flagship road drivetrain group. The Dura-Ace R9100 series.

It’s still 11-speed driven with a metal chain, but the devil is in the detail, so let’s see what’s up with this grouppo.

Crankset

At first glance, it’s easy to point out that the FC-R9100 crankset has an (even) bigger crankarms, a darker finish (instead of the two tone silver/black) than the previous generation, but there’s much more under the hood. Returning are the four-bolt, Hollowtech II crankarm construction, but the chainrings profile has been reworked with a slightly wider spacing to accommodate frames with disc brakes and shorter chainstays. It’s also seven grams lighter and thank goodness the spindle remained the same at 24mm that we’ve come to love, or loathe, depending on who you talk to.

Integrated powermeter

Shimano is going to shake up the already crowded powermeter market a bit by offering their own power-measuring crankset, the FC-R9100-P. We haven’t seen much of the actual unit but we were told it’s a waterproof, dual-sided unit (powered by a single rechargeable battery) with an accuracy of +/- 2%. Communication will be done via your typical ANT+ and Bluetooth so you can use whatever head unit you have.

Mechanical system

On the cable-actuated side, the front derailleur (FD-R9100) has been reworked so that gone is the long lever arm. The light shift action remains but the action is much more compact, and cable management is said to be much easier.  Shimano has also integrated the tension adjuster right into the unit, so bye bye barrel adjuster. In the rear, the RD-R9100 borrowed the proven Shadow design from Shimano’s mountain bike derailleurs for a lower profile (no words on the possibility of any aero benefit – yet), direct mount capability, as well as better survivability in case of a crash (because shit happens). The hanger pulleys are also new, with a slightly longer toothing. To control the mechanical drivetrain, two models of STI levers will be offered. the ST-R9100 for standard caliper brakes and the ST-R9120 for hydraulic discs. The overall lever shapes remain more or less the same but with smaller detail upgrades such as textured hood tops (ala Campagnolo), and a claimed 14% shorter lever movement and 24% faster gear shift. It’s all about those marginal gains, dude.

Di2

Now that we’re done talking about the mechanical side of things, let’s talk about the Di2 system. Again, borrowing from the XTR Di2 MTB group, synchronized shifting is now available with the new Dura-Ace 9150 Di2 group. Besides the standard synchro mode where the computer shifts the front chainring while the user shifts the rear up and down the cassette, the new “semi” synchro model basically flips it the other way around where the user controls the front chain ring while the computer shifts the rear to keep a consistent cadence. Pretty novel concept, don’t you think? Hardware wise, the new rear derailleur (RD-R9150) will receive the shadow treatment similar to its mechanical brethren while the front derailleur (FD-R9150) remains largely the same.

Ultegra 6870 and Dura-Ace 9070 owners rejoice

New firmware is coming  to your existing 11-speed Di2 groups this November so the synchro shift option is there if you so please.

Two more things on Di2

The lowly but oh so important cable junction box got a makeover and now there’s the option of having it integrated into compatible frames and handlebar ends for a cleaner appearance. Sure beats having a tiny black box at the bottom of your stem. While Shimano didn’t go full wireless like SRAM eTap, Shimano is releasing a wireless junction box, the EW-WU111, made to enable programming of the Di2 system from a tablet or phone (instead of a pc), as well as to those who want to transfer drivetrain data to computers for better visualization.

Derailleur

Unfortunately, the clutched Shadow Plus derailleur did not make it into the group.

Brakes

As expected, Shimano didn’t stop making caliper brakes while launching their first Dura-Ace disc brake. And as if the previous Dura-Ace brake is not good enough, the new brake calipers have been updated for even more stopping power and clearance (thank you) for 28C tires. For the hydraulic brakes side of things, however, it’s completely new. The hydraulic caliper utilizes the Flat Mount mounting system for a smaller footprint while a wider pad clearance was made to further minimize rubbing. The most visually-striking part of the brake system, though, has got to be the new SM-RT900 Ice-Tech Freeza rotor. While the stainless steel braking surface remains, the rotor’s aluminum inner core now extends out as one continuous piece towards the center for better a 30% heat reduction. And similar to its predecessor, it will only be offer with Centerlock mount in 140mm and 160mm diameter, just big enough to double as a pizza cutter and throwing star (but don’t tell the UCI about that)

Chain

It’s the same CN-HG901-11 with the tool-free connecting link. Nothing new here.

Cassette

Not much different other than the new 11-30 cassette combo. Let’s hope the dreaded cracked cassette syndrome is done and over with.

Pedals

The overall design is the same as any other SPD-SL pedals but the new PD-R9100 pedals are now 24.5 grams lighter and now shipped with hollow cleat bolts (ProTip: Use good hex keys).

Wheels?

Well, that’s another department deserving of a separate post. But yes, there are redesigned hoops in various materials and forms
…

Price and availability

The full R9100 mechanical group will be available this September for $2029.92. The R9100/R9120 mechanical/hydro brake group will come at $2354.90; The R9150 Di2 group will $3046.85 whereas the R9150/R9170 Di2 with hydraulic brakes will cost the most at $3137.90. Yea, there’s actually four similar, but different groupsets this time around within the Dura-Ace family.