Shimano launches GRX, gravel dedicated drive components

Featuring multiple options including double and single drivetrains, mechanical or electronic shifting, 11 and 10-speed drivetrains, dropper post integration and wide or close-range gear ratios dedicated to every style of gravel and adventure riding.

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Following a comprehensive research, testing and development process, bringing together global feedback from riders on trails, bridleways, pavement and paths at all levels of competitiveness, Shimano introduces a new component series known as GRX; the world’s first dedicated family of gravel/adventure components built for both fast riding and assured capability on loose surfaces.


GRX offers RX800, RX600 or RX400-series components with 1x11, 2x11 and 2x10 drivetrains and mechanical and Di2 electronic shifting options, allowing riders to tailor their mixed surface riding experience and explore beyond their usual limits to pursue a wide range of terrain.


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Developing the series took Shimano’s development team well outside traditional confines to create a platform that addresses riders’ needs now and into the future. Be it gravel riding, modern adventure road riding, bikepacking, or fulfilling the needs of discerning cyclocross racers, SHIMANO GRX provides options ranging from gravel-tuned gearing ratios to custom ergonomics, from dropper post integration to gravel-specific GRX wheels with wider rim profiles.



The components

Diving into the detail, GRX includes three crankset options - 1x11, 2x11 or 2x10-speed – plus front and rear derailleurs, disc brake calipers with an in-line brake lever option, and left and right STI hydraulic levers, coming in either Di2 shifting or mechanical shifting options.




These components employ Shimano’s class-leading drivetrain technologies from both the road and mountain bike side to deliver the hallmark shifting precision and stability for which the company is known. With GRX the net result is a smooth and quiet-running drivetrain that is specially tuned for the unique characteristics of gravel terrain, riding positions and gravel bicycle designs.


For simplicity, Shimano GRX recommends using Shimano MTB (Deore XT, SLX or Deore) or Road (Ultegra, 105, Tiagra) cassettes and chains that already exist in the Shimano lineup. In addition to the category-leading Shimano GRX 800 series, there are also more affordable 11-speed components, a 600-series crank and set of shifters, which can be mixed seamlessly with 800-series parts, and 10-speed cranksets, derailleurs and shifter/brakesets. This means that you can create everything from a light-weight racing-level GRX stead at the premium level to a leisure-riding GRX workhorse at the more economical level.


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GRX Cranksets: The GRX cranksets are built for tackling different riding terrains and riding styles, all coming with a +2.5mm chainline for increased tire and frame clearance. GRX single ring cranksets offer the simplicity of shifting only on the rear cassette (options include RX800/600 40T cassettes or the RX800 42T cassette) and are delivered with Shimano’s Dynamic Chain Engagement tooth profile on the front chainring to offer increased chain retention over bumpy ground. Meanwhile the GRX double chainring RX810 crankset employs a 17-tooth gap which, at 48-31T, is the company’s widest-ever gear ratio. Together with the additional RX600-11/10 46-30T options, the double cranksets give big enough gear ratios for tackling the steepest climbs and pinning the steepest descents.


GRX crankset weights: 1x11: FC-RX810-1: 655g (pictured), FC-RX600-1: 753g. 2x11: FC-RX810-2: 722g (pictured), FC-RX600-11: 816g, FC-RX600-10: 819g


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GRX Front derailleurs (FD): Complementing the cranksets, the Di2 (FD-RX815) or Mechanical (FD-RX810/RX400) front derailleurs are built with 2.5mm more outbound clearance for wider tires (up to 42mm) to cope with riding on rough roads. This means GRX front derailleurs must be combined with Shimano GRX +2.5mm cranksets. Both RX800-series mechanical and Di2 front derailleurs are built to accommodate Shimano’s widest 17T front chainring 48-31T gear ratio whilst the FD-RX400 10-speed derailleur accommodates the 16T chainrings found on the RX600 46-30T 10-speed cranksets. All front derailleurs provide Shimano’s legendary front shifting performance. Shimano Di2 FD’s can be perfectly adjusted using Shimano’s simple and integrated controls whilst mechanical FD’s bring an extremely light front shifting feeling with an ergonomic power curve, toggle link construction for more cable routing options and an integrated cable tension bolt for precise and easy adjustments.


GRX front derailleur weights: FD-RX815-F: 131g (pictured), FD-RX810-F: 94g (pictured), FD-RX400: 95g


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GRX Rear derailleurs (RD): Adopting the technology introduced in 2018’s RX rear derailleur, the GRX Di2 RDs (RD-RX815/RX817) or mechanical RDs (RD-RX810/RX812/RX600) are designed for silent, smooth and reliable shifting on rough terrain with a chain stabilizing system known as SHADOW RD+ to manage ‘chain chatter’, minimize unnecessary derailleur arm movement and provide uninterrupted shifting performance. GRX comes with the choice of four derailleurs depending on which cassette and gear shifting operation you choose. Riders using an Ultegra, 105 or Tiagra level 11-30/34T cassette will need to use the short cage Di2 RD-RX815 or mechanical RD-RX810 rear derailleur, whilst riders choosing a Deore XT, SLX or Deore level 11-40/42 cassette will need to use the longer cage Di2 RD-RX817 or mechanical RD-RX812 RD, both of which come with a pull ratio similar to Shimano’s road derailleurs.


GRX rear derailleur weights: Di2: RD-RX815/RD-RX817 (pictured): 288/322g. Mechanical: RD-RX810/RD-RX812 (pictured): 251/264g


GRX STI levers: GRX shifting comes courtesy of dedicated gravel-specific ergonomic levers (Di2: ST-RX815 or Mechanical: ST-RX810/RX600/RX400, ST-RX810-LA) featuring an 18mm higher axis point, curved brake lever profile and anti-slip textured finish which can be gripped with assurance over rough terrain.


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To integrate the use of dropper posts in gravel riding, SHIMANO created the GRX mechanical ST-RX810-LA left hydraulic disc brake lever that, when used with a 1x11 drivetrain, can control a dropper post whilst also keeping the cockpit tidy. The integrated cable pulling system has a 9mm lever throw to operate dropper posts with cable heads at the shift lever. SHIMANO GRX also includes 1x11-specific RX800 and RX600-series left side hydraulic disc brake levers with no dropper or shift internals, including the 1x11 Di2 left-hand lever (ST-RX15), which comes with three buttons (two side buttons and a hood top button) for operating ancillary functions such as lights or 3rd party computers.


GRX STI shift/brake lever weights: ST-RX815-L/R Di2: 565g, ST-RX810-LA Left side dropper post lever: TBDg, ST-RX600-L/R: 611g, ST-RX400-L/R (10-speed): 613g


GRX Braking systems: A primary concern of gravel riders is having enough brake power to control speed on steep and sudden descents. That’s why, at the top tier of the GRX family, one variant of the RX800-series brake levers (ST-RX815) offer Servo Wave technology coming from Shimano’s mountain bike brakes. This provides a stronger braking feeling with greater modulation options for more aggressive riding. If you prefer the RX810 non-Servo Wave version, or the RX600 and RX400-series levers, they still provide an excellent level of disc brake stopping power, akin to Ultegra, 105 or Tiagra road disc brakes respectively.




An additional braking option comes with an inline hydraulic sub-brake lever (BL-RX812-L/R) which connects to the main hydraulic line running to the front and/or the rear caliper. The sub-brake lever is designed to be mounted on the handlebar next to the stem offering options for braking when riding with hands on the tops.


GRX hydraulic disc sub-brake lever weight: BL-RX812L/R: TBDg


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The GRX calipers (BR-RX810/400) echo the design of Shimano’s flatmount road calipers to deliver powerful brake performance, taking features like one-way bleeding and ICE TECHNOLOGIES heat-dissipating finned brake pads and rotors to offer efficient cooling and long-lasting brake performance.


GRX calipers: BR-RX810: TBDg, BR-RX400: 143g


Gravel-specific Wheelset:


To complete the experience, Shimano tips its cap to the experimental spirit of gravel with two gravel/adventure-inspired 12mm E-THRU axle wheel sets (WH-RX570-TL-F12/R12). The 700c or 650b (non-Boost) tubeless-ready wheelsets offer an optimal balance between weight, stiffness and gravel durability, bringing a wider 21.6mm inner rim width (comparable with MTB XC wheels) and an off-set rim height of 22mm.


GRX wheelsets: WH-RX570 700c: 1600g/pair, WH-RX570 650b: 1540g/pair


Overall, with the multiple options and specifications available, GRX has a broad appeal and a broad message to riders of all disciplines.


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gummibear, May 07 2019 06:17

Cool looking components.Wonder where it will slot in with pricing?

BaGearA, May 07 2019 08:52

too little too late shimano 




* PS is it just me or do those drop bar levers look gigantic ?

Farrnus, May 08 2019 03:57

options are a good thing!!! and Shimano's commitment to both 1x and 2x is refreshing!!! 

YetiFan, May 09 2019 10:46

Yawn... trying to play catch-up but falling further and further behind the competition

Grease_Monkey, May 09 2019 12:36

They are claiming that this is the world's first commited gravel line. What am I missing? Because afaik Sram has been making a commited gravel line for years now...

Nick, May 09 2019 02:08

They are claiming that this is the world's first commited gravel line. What am I missing? Because afaik Sram has been making a commited gravel line for years now...


Petty stuff but I think they're making a distinction between gravel and cyclocross. SRAM's marketing has catered for both.

Waynemol, May 09 2019 02:20

and 5 minutes later Sram will launch a 1 x 12 eagle gravel 

Clinton H, May 09 2019 02:26

Oh hello Shimano ..... welcome to the party  ,pity its already over !

Kom, May 09 2019 03:30

My three year old diverge ran great with Shimano 105 11speed ratio option and hydraulic brakes. I’m struggling to see an ounce of innovation in this release other than an acronym slapped onto some hybrid XT/R8000 component set. SRAM are so far ahead in the game it’s amazing how far behind Shimano have fallen.

SwissVan, May 10 2019 05:27

Front derailer
Imagine that

Heel Drop, Jan 16 2020 11:20

who stock this in SA?

LnCooper, Jan 18 2020 07:02

It’s about time that there will be a group set
That just won’t let u down 👍🏻