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Shimano

Shimano GRX Di2 RX815 2x11 front derailleur, braze-on

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Shimano GRX Di2 RX815 2x11 derailleur

The electric derailleur Di2 RX815 is designed for gravel bikes with 11-speed shifting systems.
Product features
The chainline is 2.5 mm wider than a conventional road derailleur
Fast and smooth shifting even at high torque
Product details
Groupset Shimano GRX
Gears 2x11
Control type electronic
Mounting type brazed-on
Material aluminium, steel
product ID 87363
Product rating  (2 ratings)
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Krzysztof73 Krzysztof73 • 9 April 2024 at 19:59
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Great equipment at a great price, I recommend it.

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9 April 2024 at 19:59
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bita8 bita8 • 7 June 2024 at 9:40
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CS Proste super

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7 June 2024 at 9:40
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Product questions
cardiobj cardiobj • 21 september 2025 at 8:05 edit
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SK ak mám cestnu kluku ultegra 11sp. 46/34T a vzadu ultegru 11-32T, mozno pouzit tento presmykac? Ev. bol by kompatibilny aj keby som na cestaku vzadu chcel mtb kazetu 11sp XT 11-42 s M8050 Di2 prehadzovackou? (ide mi o to, ci to vobec system zoberie, či nebude v e-tube hlasit inkompatibilitu; ostané čo sa týka prehadzovania, hlucnosti uz poriesene mam). vdaka

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21 september 2025 at 8:05 edit
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jaroslavf jaroslavf Customer support • 23 september 2025 at 6:55 •replycardiobj
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SK Dobrý deň,

S kazetou 11-32 a cestnou 11sp. Di2 prehadzovačkou môžete prešmyk použiť. S MTB prehadzovačkou ale kompatibilný nie je.

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23 september 2025 at 6:55
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Attilka Attilka • 27 June 2023 at 9:00
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I wish you a good day
Can it be used with an Ultegra 50/34 crank on a road bike?
well thank you

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27 June 2023 at 9:00
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gronkjear gronkjear Customer support • 27 June 2023 at 14:00 •replyAttilka
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SK Dobry den,

zial nie, presmyk je vhodny pre max. 46-48T prevodniky.

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27 June 2023 at 14:00
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tauvec tauvec • 7 March 2025 at 8:52
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CS Dobrý den,
jakou potřebuji objímku když nemám navářku?
Děkuji.

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7 March 2025 at 8:52
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anetazichova anetazichova Customer support • 7 March 2025 at 9:41 •replytauvec
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CS Dobrý den,
posílám odkaz:
https://www.mtbiker.cz/shop/komponenty/presmykace/prislusenstvi/shimano-sm-ad91-objimka-na-presmykac-349-a-318-286-mm-p50527.html
Vyberte si variantu podle průměru sedlové trubky.
Případná alternativa:
https://www.mtbiker.cz/shop/komponenty/presmykace/prislusenstvi/force-objimka-pro-silnicni-presmykac-p402.html

Pěkný den,

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7 March 2025 at 9:41
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tomlaz tomlaz • 21 september 2025 at 18:38
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CS Nedá.

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21 september 2025 at 18:38
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WARNING
For installation, adjustment and replacement information that is not found in the user's manual, please consult the place of purchase or a distributor. A dealer's manual for professional and experienced bicycle mechanics is available on our website (https://si.shimano.com).
For safety, be sure to read this "user's manual" thoroughly before use, follow it for correct use, and save it so that you can refer back to it at any time.
The following instructions must be always followed in order to prevent personal injury and physical damage to equipment and surroundings. The instructions are classified according to the degree of danger or damage that may occur if the product is used incorrectly.
DANGER - Failure to follow the instructions will result in death or serious injury.
WARNING - Failure to follow the instructions could result in death or serious injury.
CAUTION - Failure to follow the instructions could result in personal injury or physical damage to equipment and surroundings.

WARNING
- Do not disassemble or modify the product. This may cause the product to not operate correctly, and you may fall unexpectedly and be seriously injured.
- Be careful not to get your fingers caught in the derailleur when operating the shift switch. The powerful motor that drives the electronic gear shift derailleur will run without stopping until the shift position is reached.
- Be careful that parts of your clothing do not get caught in the chain during riding. If they do, you may fall off the bicycle.

Shimano
Road Shimano
Japanese manufacturer produces road, mountain, gravel, trekking, BMX and e-bike groupsets. They also offer a whole series of components and apparel. Their range goes from wheels, footwear, eyewear to backpacks. Shimano is a traditional manufacturer known for their quality work, which is why they are the favourite choice of amateurs and professionals.
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