Gravel Gear Upgrade Kit 12x2-speed Di2 Conversion Kit Shimano GRX RX825

The Shimano GRX Di2 upgrade kit for GXR 12x1-speed gear components, suitable for 12-speed cassettes up to 36 teeth and 2-speed cranksets with 48-31 chainring spacing. The 12x2-speed Di2 GRX components offer finely graduated gear ratios for all applications.

Contents of the Shimano GRX 825 Di2 Gravel groupset:

• Shimano GRX rear derailleur, RD-RX825 Di2 SGS
• Shimano GRX front derailleur FD-RX825 Di2, solder-on mount
• Shimano GRX STI, Dual Control Disc shift/brake levers, 12-speed, ST-RX825 Di2
• Shimano GRX STI, Dual Control Disc shift/brake lever, 2-speed, ST-RX820 Di2
• Shimano GXR disc brake calipers BR-RX810, flat mount
• Shimano disc brake hoses 100 and 170 cm, SM-BH-90-JK-SSR
• Front wheel adapter, fixing bolts
• Shimano Di2 cable set, EW-SD300: 2 cables
• Shimano Di2 battery, BT-DN300 internal round
• Optional charging cable
• Optional Shimano 105 or Ultegra cassette, in 11-34 or 11-36 tooth configurations
• Optional Shimano 105 or Ultegra chain
• Optional Shimano SMRT800 or SMRT86 brake discs
• without oil

Shimano GRX Di2 12x2-speed:

SHIMANO’s new gravel component family is now being expanded with an electronic version of the 2x12-speed GRX system introduced last year. By combining the new Di2 shift/brake levers, along with matching satellite shifters, the front derailleur and rear derailleur from the GRX RX825 series with the existing cranks, cassettes and brakes from the RX820 range, the legendary shifting performance and reliability of the GRX 2x12-speed system can be elevated to a new, Di2-driven level.

Unlike the 12-speed wireless systems of the DURA-ACE, ULTEGRA and SHIMANO 105 Di2 series, the GRX Di2 system uses cable connections where it makes sense and provides real added value, namely for the stable, secure and sustained power supply to the rear derailleur and front derailleur via the central battery. The rear derailleur and front derailleur are connected directly to the multi-port battery via thin cables, thereby eliminating the need for connecting elements – known as junctions – and simplifying the installation process. The centralised power supply reduces the complexity of charging procedures and varying charge levels of the individual components, whilst ensuring a stable power supply even under high mechanical stress in off-road conditions.

Wireless SHIMANO Di2 cockpit

SHIMANO’s 12-speed GRX Di2 features a gravel-specific cockpit, in which raised grips with a ribbed surface texture and non-slip brake levers enable safe and reliable operation even under extreme conditions. As with the previous models, the GRX RX815 series Di2 shift/brake levers, the third Di2 shift button on the inside of the levers ensures that, with the new DUAL CONTROL levers, your hand does not have to leave the secure grip on the handlebars to control additional functions. Whether used as an additional control option for the shifting system or to conveniently scroll through the pages of a compatible bike computer, this third button is undoubtedly a huge asset that makes the SHIMANO Di2 system even more versatile.

Shimano GRX ST-RX825 STI

Like its 12-speed counterparts in the DURA-ACE, ULTEGRA and SHIMANO 105 Di2 series, the GRX Di2 system relies on cable connections where this makes sense and offers genuine added value, namely in the stable, secure and sustained power supply to the rear derailleur and front derailleur via the central battery. Thin cables connect the rear derailleur and front derailleur directly to the multi-port battery, thereby eliminating the need for connecting elements – so-called junctions – and simplifying the installation process. The central power supply reduces the complexity of charging procedures and varying charge levels of the individual components, whilst ensuring a stable power supply even under high mechanical stress off-road. The new DUAL CONTROL shift/brake levers have been designed to integrate seamlessly into a modern gravel cockpit with flared handlebars. With a slightly rounded shape, the transition from the handlebars to the STI levers is particularly smooth and also increases the grip surface, reducing the risk of pressure points.

Wireless SHIMANO Di2 cockpit

SHIMANO’s 12-speed GRX Di2 features a gravel-specific cockpit, in which raised horns with a ribbed surface texture and non-slip brake levers enable safe and reliable operation even under extreme conditions. As with the previous models, the GRX RX815 series Di2 shift/brake levers, the third Di2 shift button on the inside of the horns on the new DUAL CONTROL levers ensures that your hand does not have to leave the secure grip on the handlebar to control additional functions. Whether used as an additional control option for the shifting system or to conveniently scroll through the pages of a compatible cycle computer, this third button is undoubtedly a huge asset that makes the SHIMANO Di2 system even more versatile.

Additional Di2 switches

The new Di2 system also allows for the integration of additional shifters, another advantage of electronic shifting systems. By expanding the system with additional shifters on the top tube, down tube or aero extensions, riders can select the optimal gear in every conceivable grip position without having to change their grip. However, these additional shifters can also be assigned numerous other functions via the E-TUBE PROJECT Cyclist app, such as controlling compatible bike computers, lap counters and much more.

The new Di2 platform for 12-speed components requires no cable connection to the rear derailleur or front derailleurs. The Di2 Dual Control shift levers ST R8170 have the necessary wireless module integrated. Power is supplied by CR1632 batteries, which have a service life of up to 2 years. The Di2 12-speed rear derailleur, with its additional wireless unit, acts as a receiver and distributor of shift signals and is connected to the battery and front derailleur for power supply and shift command transmission. Additional wireless components, including those from third-party manufacturers, can also be paired with the rear derailleur.

Configuration via E-TUBE PROJECT and FRONT SHIFT NEXT

Using SHIMANO’s E-TUBE PROJECT Cyclist app, users can, among other things, modify and fine-tune the shift intervals in Multi-Shift mode, the assignment of functions to individual shift buttons, and the parameters for Synchronised and Semi-Synchronised Shift, adapting them to individual preferences, riding style or intended use. The launch of the RX825 coincides with the debut of a brand-new front derailleur shifting function called FRONT SHIFT NEXT. Available in future via a firmware update, the E-TUBE PROJECT Cyclist app allows any Di2 button on all 2x12-speed systems – including current road bike groupsets – to be assigned the function of shifting the front derailleur to the currently unused chainring and back again. If the chain is on the large chainring, the button shifts to the small one; if it is on the small chainring, the same button shifts to the large one. The result is even faster, more intuitive shifting, as well as the option to assign any other function to the button on the STI that is freed up as a result.

Shimano GRX Disc Brake Caliper BR-RX820:

The BR-RX820 gravel disc brake calipers for the 12-speed GRX groupset. These calipers are compatible with all Shimano disc brake levers. Recommended brake discs: RT-MT800. Thanks to the 10 per cent greater spacing between the brake pads, the brakes can be adjusted more effectively and noise is minimised.

The BR-RX820 gravel disc brake calipers, with 10 per cent more clearance between the brake pads, are particularly resistant to twisting and are approved for brake discs up to 160 mm. Equipped with brake pads featuring external cooling fins, brake heat is reliably dissipated. These calipers are compatible with all Shimano disc brake levers. The bleed system has been redesigned and made significantly simpler. Recommended brake discs: SM-RT800, SM-RT86

Flat Mount Standard:

The new Flat Mount brake caliper standard for road bike brakes reduces weight and offers a significantly sleeker look. With the Flat Mount standard, the rear brake caliper sits directly on the chainstay; no adapter is required for caliper mounting. The bolts pass through the chainstay from below directly into the brake caliper. A flat adapter is still required on the fork. The adapter is screwed onto the rear of the fork leg, with the brake sitting directly on the adapter.

Shimano GRX FC-RX820 crankset:

The GRX cranksets have been developed to handle a wide variety of terrain and riding styles. All versions feature a 2.5 mm wider chainline, which creates more space in the frame design and allows for wider tyres. The GRX 12x1-speed crankset minimises shifting complexity by requiring shifting only at the rear cassette and is equipped with chainrings featuring Shimano’s Dynamic Chain Engagement+ tooth profile, which ensures optimal chain retention, particularly on rough terrain.

Shimano CN-M8100 chain:

The chain is perfectly matched to the 12-speed Shimano chainrings with Dynamic Chain Engagement+ (DCE+) tooth profiles. The HG Plus chain has been completely redesigned and features even finer, precision-machined contact surfaces with the sprockets and chainrings, particularly on the inner links. Furthermore, the inner links are chrome-plated, making them even more durable whilst delivering excellent shifting performance when shifting up or down.

Shimano CS-HG710-12:

The 12-speed cassette with 11-36 tooth spacing offers a gear range of 327 per cent. Whether for sprints on the flat or steep climbs, it provides the right gear ratio for every situation. The gear ratios have been optimised for high pedalling efficiency, with the first eight sprockets ensuring natural and smooth transitions. The four largest sprockets cover a wide gear range without any abrupt changes in gear ratio.

Compatible bottom bracket shells – bottom brackets

There is now a wide variety of bottom bracket shells on modern frames. Shimano only offers compatible bottom brackets for some of these. To ensure the GRX groupset fits all frames, we supply optional FSA or Wheels MFG bottom brackets for the bottom bracket shells for which Shimano does not offer bottom brackets. Wheels Outboard bottom brackets are significantly more durable than standard press-fit bottom brackets, as the cup halves are bolted together, ensuring they sit flat and securely within the frame. Wheels bottom brackets are available with different bearing grades: ABEC3 standard bearings, angular contact bearings and ceramic bearings.

• BSA threaded housing, 68 mm installation width
  Shimano Dura Ace SM-BBR60B bottom bracket
• BSA threaded housing, 70 mm installation width
  Shimano Dura Ace SM-BBR60I bottom bracket
• Pressfit BB86 housing, installation width 86.5 mm, press-fit diameter 41 mm, Shimano
  SM-BB71-41B bottom bracket or Wheels MFG Outboard
  BB86-OUT bottom bracket
• BB30 shell, installation width 68 mm, press-fit depth 42 mm Wheels MFG Outboard
  BB30-OUT bottom bracket
• BB30A housing: press-fit depth 42 mm, bottom bracket width 73
  mm (asymmetrical), Wheels Outboard bottom bracket, item no.: BB30A-OUT-SHIM
• Pressfit 30 shell, installation width 68 mm, press-fit dimension 46 mm, Wheels MFG
  Outboard bottom bracket PF30-OUT
• Pressfit 30A shell: Press fit 46 mm, bottom bracket width 73
  mm asymmetrical, Wheels Outboard bottom bracket, item no.: PF30A-OUT-SHIM
• BBRight housing, installation width 79 mm, press-fit dimension 46 mm Wheels MFG Outboard
  BBRIGHT-OUT bottom bracket
• BB386 shell, installation width 86.5 mm, press-fit dimension 46 mm
  , Wheels MFG Outboard 386EVO + 386EVO-SHI
• BB90 shell, installation width 90 mm, press-fit dimension 41 mm FSA
  230-600 bottom bracket
• T47 thread: M47x1 Bottom bracket width 68–132 mm, compatible bottom brackets:
  Wheels Outboard Item No.: T47-BB-SHIM-AC

Herstellerinformation: SHIMANO INC., 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan, www.shimano.com | EU contact: Shimano Europe BV, High Tech Campus 92, 5656 AG Eindhoven, The Netherlands, www.shimano.com