The complete Gravel Shimano GRX 825 12-speed Di2 groupset offers a top-of-the-range solution for cyclists seeking a precise, fast and reliable electronic drivetrain, specially designed for gravel riding. Part of the Shimano GRX range, this groupset combines the benefits of Di2 electronic gear-shifting with ergonomics suited to long rides on roads, tracks and rough terrain.
Thanks to its wireless transmission system in the shifters and its electronic rear derailleur, the GRX RX825 Di2 ‘ Shimano ’ offers smooth and precise gear changes, even when riding conditions become demanding.
Designed to meet the expectations of recreational cyclists and gravel racers, it allows you to enjoy a modern, high-performance drivetrain that is perfectly suited to varied terrain.
Groupset description
The Shimano GRX RX825 Di2 stands out for its semi-wireless operation: the shifters communicate wirelessly with the derailleurs, whilst the electronic components are powered by a central battery. This design keeps the handlebar area clean and tidy, with no visible shift cables.
The ergonomic GRX RX825 shift levers are specially designed to offer an excellent grip on flared gravel handlebars. Their design enhances bike control, particularly on technical descents and uneven trails.
The Di2 electronic drivetrain ensures fast and smooth gear changes. The system also allows you to customise the controls and gear-changing modes via the E-TUBE PROJECT app Shimano.
The GRX RX825 rear derailleur features SHADOW RD+ technology with chain stabilisation. This minimises chain movement and unwanted noise when the terrain becomes rough. The electronic front derailleur, meanwhile, ensures precise and efficient chainring changes.
With its double-chainring crankset and 12-speed drivetrain, this groupset offers a wide range of gear ratios, allowing you to switch easily between fast-paced sections, climbs and technical sections.
The GRX 825 Di2 Shimano t is therefore an excellent choice for a high-end gravel bike, suited to both competitive rides and long adventures on the trails.
Technical specifications
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Feature
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Details
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Brand
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Shimano
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Range
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GRX
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Series
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RX825 Di2
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Drivetrain type
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Electronic
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Number of speeds
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12-speed
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Configuration
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2x12 chainring set
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Shifters
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Shimano GRX ST-RX825 Di2
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Front derailleur
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Shimano FD-RX825
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Rear derailleur
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Shimano RD-RX825
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Rear technology
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SHADOW RD+
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Crankset
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Shimano GRX FC-RX820-2
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Crankset gear ratio
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48/31 teeth
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Cassette
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12-speed, 11–34 or 11–36 teeth
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Chain
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Shimano 12-speed
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Braking
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Hydraulic disc brakes
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Calipers
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Shimano GRX BR-RX820
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Battery
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Shimano BT-DN300
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Spare
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Shimano cable EW-EC300
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Customisation
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Shimano E-TUBE PROJECT app
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Key features of the Shimano GRX 825 Di2
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Di2 electronic drivetrain: fast, precise and smooth gear changes.
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Gravel ergonomics: shift levers designed for flared handlebars for better control.
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Chain stabilisation: SHADOW RD+ technology to minimise vibrations and derailments.
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48/31 double chainring: versatility for fast-paced rides and steep climbs.
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Electronic customisation: adjust shifters and drivetrain modes via E-TUBE PROJECT.
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Hydraulic braking: power and control in all weather conditions.
Groupset composition
FDRX825 GRX825 Di2 12-speed front derailleur
RDRX825 GRX825 12-speed rear derailleur
CNM8100114Q M8100 12-speed chain
CSHG71012136 HG710 12-speed cassette 11-36
EWEC300 Di2 12-speed controller
RX8251DLF6RX085A GRX825 2x12-speed left-hand shifter
RX8251DRRDRX155A GRX825 2x12-speed right-hand shifter
RTCL800SI 2x Disc brakesGRX825 2x12-speed right-hand shifter RTCL800SI 2x CL800 160mm internal rotors
BTDN3001 Di2 12-speed battery
EWSD300IL120 Di2 Cable 1200mm
EWSD300IL065 Di2 Cable 650mm
SMBB7241B BB72 PressFit bottom bracket
FCRX820CX81 GRX820 crankset 48/31T
