Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset Review

Shimano Dura-Ace R9120 Disc Groupset

Get ready to experience cycling like never before with the Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset.

This remarkable piece of engineering has been meticulously designed to enhance your riding performance, efficiency, and race times.

Each component has undergone a complete re-engineering process, resulting in a harmonious blend of stiffness and weight savings. It’s a strong contender that fits your budget and offers plenty of versatility.

Stay tuned as we discuss the myriad of features that make this groupset a game-changer for cyclists everywhere.

Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset Key Features

Here’s a table summarizing the key features of the Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset:

Dura Ace 9100 with press-fit and threaded optionsKey Features
ChainsetR9100 with choice of ring sizes and crank lengths
Bottom BracketR8000 or R9100 with a choice of ratios (11-speed)
CassetteDura-Ace HG901
ChainDura Ace HG901
Rear DerailleurR9100
Front DerailleurR9100
Brake/Gear LeversST-R9120
Brake CalipersBR-R9170 Flat Mount
Disc BrakesJ-Kit form for easy assembly, ready bled
Gear CablesAll cables supplied
Design and ModulationSeamless integration for unparalleled performance
DURA-ACE CranksetLightweight, versatile, and adaptable design
RD-R9100 Shadow Rear DerailleurLow-profile design for increased shift stability
FD-R9100 Front DerailleurIntuitive shifting operation and precise setup
ST-R9120 Hydraulic Disc Brake Dual Control LeverQuick and intuitive shifting, consistent braking performance
BR-R9170 Hydraulic Disc Brake CaliperIntegrated low-profile design, improved heat dissipation
CS-R9100 HG Cassette SprocketLightweight performance, expanded gear combinations

Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset: Details

Just as we said, it’s a strong contender within a budget segment. Why though? Let’s have a look at the features and find out.

DURA-ACE Crankset

This groupset comes with an FC-R9100 Hollowtech II crankset. And most riders know the crankset exemplifies efficiency and versatility. Its iconic 4-arm design has been enhanced with increased strength and rigidity while minimizing weight.

Shimano’s Rider Tuned gearing allows for various chainring configurations, utilizing a singular BCD (Bolt Circle Diameter) for ease of use and adaptability.

shimano dura-ace r9120 dura-ace crankset

Not to mention, the redesigned chainring tooth profiling enables seamless compatibility with the latest disc brake frame designs, eliminating the need to compromise on q-factor.

The crankset’s optimized design not only saves 7g but also enhances rigidity. With options for different crank arm lengths and a wide range of gear combinations, riders can find their ideal setup for optimal performance.

Has a Shadow Rear Derailleur (11-speed)

The best thing about this groupset is that the RD-R9100 rear derailleur maintains a consistent distance to the cassette, resulting in enhanced shift stability.

Its low-profile construction not only improves aerodynamics but also minimizes the risk of damage during crashes.

It offers a total capacity of 35T and weighs a mere 158g, making it a lightweight and reliable component.

Front Derailleur Performance

The FD-R9100 front derailleur delivers lighter and more intuitive shifting operations. Its natural front shift lever stroke and ergonomic power curve provide a smooth and effortless shifting experience. 

Setting up the front derailleur is a breeze, thanks to the integrated cable tension adjustment and versatile cable routing options.

With the new link (Toggle) construction eliminates the need for special tools, further simplifying the installation process.

shimano r9120 front derailleur performance

With an adjustable cable tension and compatibility with race-specific disc brake frame designs, this front derailleur accommodates a wider front gear pitch and shorter chainstays with a 135mm OLD (Over Locknut Dimension).

The FD-R9100 weighs only 69g, ensuring minimal weight penalty.

Disc Brake Dual Control Lever

Shimano’s this redesigned internal shifting unit enhances the front shifting operation, making gear changes effortless.

Its ergonomic shape and refined hood cover material provides a comfortable grip, ensuring prolonged comfort during rides.

With an expanded reach adjustment range of 14mm and precise lever position customization, riders can achieve their preferred brake lever setup.

This groupsets hydraulic brake system delivers consistent braking performance in any condition, providing confidence and control on the road.

With a weight of 505g for the pair, the ST-R9120 strikes a balance between performance and weight savings.

Braking Performance

This design optimizes brake performance by providing a powerful and balanced braking experience and its caliper’s lightweight construction enhances overall bike weight and improves heat dissipation.

Thus, its simple setup and maintenance process, easy tool access, and wide pad clearance make maintenance hassle-free.

shimano r9120 braking performance

The one-way bleeding system simplifies bleeding procedures, keeping the brakes in top shape. Weighing just 256g for the pair, these calipers combine efficiency and reliability.

Expanded Gearing Option

The CS-R9100 HG cassette sprocket offers expanded gearing options with its inclusion of the new 11-30T ratio.

Shimano’s this groupsets combination of CFRP (Carbon Fiber Reinforced Plastic) and alloy spider arm, along with the use of five titanium sprockets.

Moreover, the cassette’s Rider Tuned gear combinations provide options for various riding styles and terrains.

With a weight ranging from 175g to 211g, depending on the selected ratio, this cassette offers versatility and adaptability to meet riders’ specific needs.


#1. Can the Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset be used with different bike frame designs?

Ans: Yes, the Dura-Ace R9120 groupset is designed to accommodate various frame designs, including those specifically built for disc brakes.

The crankset’s optimized chainring tooth profile and the front derailleur’s adaptability to race-specific disc brake frame designs allow for seamless integration and compatibility.

#2. Are the gear ratios customizable with the Dura-Ace R9120 groupset?

Ans: Absolutely. Cyclists can choose from a range of chainring configurations, such as 50-34T, 52-36T, 53-39T, 54-42T, and 55-42T, to suit their individual preferences and performance needs.

#3. Can the Dura-Ace R9120 groupset accommodate shorter chainstays on bikes?

Ans: Yes, the Dura-Ace R9120 groupset is designed to accommodate shorter chainstays. With an Old (Over Locknut Dimension) of 135mm, it allows for shorter chainstay lengths as short as 410mm.


It’s worth noting that the Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset may come with a higher price tag compared to other groupsets on the market.

Additionally, the advanced features and customization options may require some technical knowledge and expertise for installation and maintenance.

Overall, the Shimano Dura-Ace R9120 Mechanical Hydro Disc Brake Groupset is a top-tier choice for Its seamless integration, lightweight construction, and exceptional modulation set it apart from the competition.

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