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Shimano

Shimano GRX RD-RX812 rear derailleur, 11-speed, long cage (GS), Shadow +

79.99 € savings
RRP 129 €
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Rating (11)
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4,9/5
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Shimano GRX RD-RX812 rear derailleur

The RD-RX810 derailleur provides stable shifting performance, quiet and smooth operation even in difficult terrain.
Product features
Designed for 1x11 speed systems
Adjustable chain stabilizer SHIMANO Shadow RD+
Compatible with current Dual Control Lever road models
Suitable for cassettes with a combination of gears 11-40 to 11-42 teeth. Tension range: 31 teeth
Product details
Groupset Shimano GRX
Gears 2x11, 1x11, 3x11
Control type mechanical
Capacity 31 teeth
Material aluminium, steel
Weight 274 g
product ID 87354
Product rating  (11 ratings)
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matusmesik matusmesik • 9 June 2020 at 9:25
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SK vyborna prehadzovacka, absolutne ziaden problem, odporucam

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9 June 2020 at 9:25
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neron neron • 15 March 2023 at 6:31
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SK Splnila očakávania, spoľahlivá s výbornou funkčnosťou.

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15 March 2023 at 6:31
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doki11 doki11 • 23 october 2023 at 8:47
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SK Pasuje aj na 2 x 11 páčky Ultegra

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23 october 2023 at 8:47
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cepooo cepooo • 30 May 2023 at 11:29
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SK Kopec muziky za fajn peniaze

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30 May 2023 at 11:29
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sigma06 sigma06 • 22 september 2023 at 12:40
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SK Maximálna spokojnosť.

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22 september 2023 at 12:40
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pmaly1 pmaly1 • 12 April 2026 at 12:27
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SK Šľape ako hodinky

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12 April 2026 at 12:27
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vonzago vonzago • 17 July 2024 at 11:20
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SK OK

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17 July 2024 at 11:20
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fofo050 fofo050 • 11 november 2025 at 19:42
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SK Uplna spokojnosť. Perfektne radí aj s čínskymi pakami Micronew

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11 november 2025 at 19:42
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koimi12 koimi12 • 8 June 2026 at 23:25
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8 June 2026 at 23:25
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gyorgyisti gyorgyisti • 30 April 2026 at 10:40
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30 April 2026 at 10:40
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mtbiker_mariosimko449 mtbiker_mariosimko449 • 30 november 2024 at 6:45
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30 november 2024 at 6:45
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Product questions
KuboD KuboD • 23 January 2021 at 10:53
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SK ahojte. viem je to 11 rýchlostná prehadzovačka ale aj tak sa spýtam: fungovalo by to s radením grx 400 2X10? vzadu kazeta 10 rýchlostná sunrace 11-42z, vpredu prevodníkmi 46/30. Ide mi hlavne o to či 11 rýchlostná prehadzovačka ovládaná 10 rýchlostným radením obslúži 10 rýchlostnú kazetu. Krok prehadzovačky z pastorku na pastorok určuje radenie či? Môže to byť kľudne aj na základe vašich skúseností pretože v oficialnom popise od shimana sa to nedočítam. ďakujem

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23 January 2021 at 10:53
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customer-support customer-support Customer support • 3 February 2021 at 8:54 •replyKuboD
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SK Ahoj,
použitie s 10-rýchlostným radením nemáme vyskúšané. Teoreticky by to mohlo fungovať, pre správnu funkčnosť systému sa však táto kombinácia neodporúča.

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3 February 2021 at 8:54
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jurek jurek • 8 november 2022 at 11:27
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SK Ahoj,
prosim o info, ci by mi toto GRX812 fachalo s kazetou 11-46T https://www.mtbiker.sk/shop/komponenty/kazety-a-pastorky/mtb-10-11-12-prevodov/sunrace-kazeta-cs-ms8-11-46z-11-r-cierna.html#188605
Pripadne, ci sa mozno zmenou ramienka s tymto GRX pouzivat kazeta 11-46T. V predu vozim prevodlik GRX 40T.
Dakujem

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8 november 2022 at 11:27
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jaroslavf jaroslavf Customer support • 9 november 2022 at 9:15 •replyjurek
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SK Dobrý deň,

Táto prehadzovačka zvládne max. kazetu 11-42 a 11-46 nie je možné použiť a výrobca nemá ani dlhšie ramienko pre túto prehadzovačku.

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9 november 2022 at 9:15
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bmat bmat • 21 April 2023 at 16:05 •replyjurek
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SK Mozno niekomu do buducna pomoze... Oficialne 46z nie je podporovanych ale ja uz tak jazdim cca 1500 km a v pohode...

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21 April 2023 at 16:05
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hugocaves123456789 hugocaves123456789 • 17 February 2024 at 17:57
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Is it possible to buy a screw for attaching the shift cable with this derailleur? There is a protrusion/roller on it that fits exactly into the derailleur body, so I would like to use the original screw again after it was damaged.

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17 February 2024 at 17:57
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gronkjear gronkjear Customer support • 18 February 2024 at 12:43 •replyhugocaves123456789
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SK Dobry den,

podla technickeho rozkresu Shimano by sa malo jedna o specificky diel s ID: Y3GF98020 - zial u nas momentalne totalne nedostupny

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18 February 2024 at 12:43
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stevobucka stevobucka • 3 February 2022 at 12:40
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SK Zdravím,
Rád by som sa opýtal, či by táto prehadzovačka fungovala v kombinácii 2x11, v predu prevody 46/36, vzadu kazeta 11-40, dualy Shimano ST RS505
Ďakujem

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3 February 2022 at 12:40
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jaroslavf jaroslavf Customer support • 3 February 2022 at 13:04 •replystevobucka
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SK Dobrý deň,

Prehadzovačka je výhradne určená pre použitie s jednoprevodníkom. Jej kapacita nedovoľuje podľa technických info ktoré máme dostupné použitie dvojprevodníka. Možno to bude fungovať ale nemáme to vyskúšané a nevieme Vám teda 100%nú funkčnosť potvrdiť.
Pre 2x11 je určená https://www.mtbiker.sk/shop/komponenty/prehadzovace/cestne/shimano-prehadzovacka-grx-rx810-2x11-k-dlhe-ramienko-shadow-plus.html ale kazetu je možné použiť max. s rozsahom 11-34.

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3 February 2022 at 13:04
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lehoniny lehoniny • 29 July 2021 at 21:19
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SK Dobrý deň na bajku mám túto prehadzovačku a 40zubový prevodník. Prosím vás fungovalo by to aj s 42zubovým oválnym prevodníkov ?

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29 July 2021 at 21:19
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jaroslavf jaroslavf Customer support • 30 July 2021 at 6:14 •replylehoniny
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SK Dobrý deň,

Nebude problém, 42 zubový prevodník môžete použiť.

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30 July 2021 at 6:14
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lehoniny lehoniny • 30 July 2021 at 6:24 •replyjaroslavf
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SK Ďakujem za odpoved 🙏🏻
Myslite že bude treba meniť aj reťaz ?

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30 July 2021 at 6:24
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gronkjear gronkjear Customer support • 30 July 2021 at 10:53 •replylehoniny
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SK Dobrý deň prajem,

obávam sa, že áno. Resp. že ideálne by bolo použiť o cca 1 až 2 články dlhšiu reťaz ako máte teraz - kvôli väčšiemu prevodníku, naviac oválu.

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30 July 2021 at 10:53
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Tyirko Tyirko • 18 January 2026 at 10:04
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Hi. Can I buy just the chain guide for this derailleur? I.e. the small piece about 10cm long at the back between the wheels?

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18 January 2026 at 10:04
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gronkjear gronkjear Customer support • 18 January 2026 at 20:24 •replyTyirko
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SK Ahoj,
vnutorne voditko dostupne skladom - https://www.mtbiker.sk/shop/komponenty/prehadzovacky/prislusenstvo/shimano-rd-m8000-gs-vnutorne-ramienko-prehadzovacky-p41957.html?preview#description.
Vonkajsie zial aktualne nedostupne: https://www.mtbiker.sk/shop/shimano-grx-rd-rx812-vnejsi-voditko-prehazovacky-p292084.html?preview

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18 January 2026 at 20:24
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reno reno • 22 august 2025 at 13:35
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SK Prehadzovačku grx čo zoberie 11- 46 kazetu nemate? Musí byť 11 s. Prípadne dlhšie komplet ramienko pre tuto prehadzovačku?

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22 august 2025 at 13:35
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gronkjear gronkjear Customer support • 22 august 2025 at 13:56 •replyreno
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SK Dobry den, zial taky variant GRX prehadzovaca Shimano v ponuke nema.

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22 august 2025 at 13:56
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andrejhodal andrejhodal • 29 august 2025 at 15:18 •replyreno
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SK Grx 812 zoberie v pohode kazety 11-46 aktuálne ju jazdím kazeta slx

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29 august 2025 at 15:18
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Mato42 Mato42 • 2 May 2022 at 16:00
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Good day,
I would like to ask if this derailleur would work with Shimano 105 5800 gears.
Thank you

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2 May 2022 at 16:00
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gronkjear gronkjear Customer support • 5 May 2022 at 19:52 •replyMato42
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SK Dobrý deň,

áno, radenie zo sady 5800 Vám bude fungovať aj s touto prehadzovačkou.

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5 May 2022 at 19:52
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Mato42 Mato42 • 7 May 2022 at 17:52 •replygronkjear
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SK Dakujem

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7 May 2022 at 17:52
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tibcco tibcco • 29 october 2019 at 18:54
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SK Zdravim, jedna sa o nasledovny diel :
https://bike.shimano.com/en-EU/product/component/grx-11-speed/RD-RX812.html
?
Nie celkom mi sedi popis.
Dakujem

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29 october 2019 at 18:54
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spyderman spyderman • 20 august 2019 at 9:00
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SK Ja by som toto dal skor do kategorie cestnych...

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20 august 2019 at 9:00
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WARNING
For installation, adjustment and replacement information about products not found in the user's manual, consult the place of purchase or a distributor. A dealer's manual intended 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 to it at any time.
The following instructions should always be followed in order to avoid personal injury and physical damage to equipment and the environment. 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 the environment.

WARNING
- Do not disassemble or modify the product. This may cause the product to malfunction, you may fall unexpectedly and be seriously injured.
- Never use alkali or acid based solvents such as rust removers. If a solvent is used, the chain may break and cause serious injury.
- Clean the chain regularly with a suitable chain cleaner. Maintenance intervals depend on the circumstances of use and riding.
- Check that the chain is not damaged (deformation or cracking), does not skip or show any other anomalies, such as arbitrary shifting. If any problems occur, contact the place of purchase or a distributor. The chain may break and you may fall.

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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