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Shimano Ultegra Di2 Rd-Rx805 Rear Derailleur

4.8 4.8 out of 5 stars 14 ratings
$239.99 with 20 percent savings
List Price: $299.99

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Grey
GS - medium
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Purchase options and add-ons

Brand SHIMANO
Color Grey
Material other
Item Weight 13.44 ounces
Mounting Type Braze-On Mount

About this item

  • Country of origin:- China
  • Colour: Standard
  • Package Dimensions (L x B x H) in cm: 2.64 x 2.02 x 1.55

Frequently bought together

Shimano Ultegra Di2 Rd-Rx805 Rear Derailleur
$239.99
Get it May 21 - 23
Only 1 left in stock - order soon.
Ships from and sold by Bike bling.
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Shimano Ultegra Di2 Fd-R8050 Front Derailleur
$191.65
Get it as soon as Monday, May 20
Only 20 left in stock - order soon.
Sold by Movatik and ships from Amazon Fulfillment.
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Product Description

The Ultegra Di2 RD-RX805 Rear Derailleur is meant to take on all the rigors of rough road and gravel riding. Its clutch system improves shifting and reduces noise from chain slap, and there's compatibility with both 1x and 2x drivetrains and Shimano Di2 shifters. Experience smooth Di2 electronic shifting, a quiet ride and a good time.

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Shimano Ultegra Di2 Rd-Rx805 Rear Derailleur

Shimano Ultegra Di2 Rd-Rx805 Rear Derailleur

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Customer reviews

4.8 out of 5 stars
4.8 out of 5
14 global ratings

Top reviews from the United States

Jean-Michel
5.0 out of 5 stars Love the ability to go big cassettes
Reviewed in the United States on October 4, 2023
Color: GreySize: GS - mediumVerified Purchase
Perfect addition to use bigger gears !
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fuel98rider
5.0 out of 5 stars Another Quality Shimano Di2 Part
Reviewed in the United States on June 10, 2020
Verified Purchase
Great derailleur for Di2. This is almost identical to the GRX Di2 derailleur, but was cheaper to buy. I am using this on my Di2 gravel bike which came with SRAM cable derailleurs. This is just much so much smoother. The derailleur has a claimed capacity of 34t for the cassette, but it a working fine on a SRAM 11-36t cassette. The derailleur shifts quickly and is easy to adjust and set up.
2 people found this helpful
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TheRo0sTer
5.0 out of 5 stars Di2 & clutched FTW!!!
Reviewed in the United States on February 26, 2019
Verified Purchase
When I purchased the newer Ultegra Di2 rear derailleur, weeks later Shimano released this one. It is a must have if you ride gravel. Even more so if you are riding 1X. I have not had a dropped chain or chain wrap since my purchase. I have had the lever come disengaged from CX to road. None the less... GREAT PRODUCT!!!
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Pupo
5.0 out of 5 stars Delivered on time
Reviewed in the United States on May 18, 2019
Verified Purchase
Perfect
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Camp Runamok
5.0 out of 5 stars Great shifting that works perfectly with up to an 11/40 cassette
Reviewed in the United States on December 24, 2022
Color: GreySize: GS - mediumVerified Purchase
While not rated for a 40 tooth cog, Shimano derailleurs always go one size bigger than spec'd, and this is no exception. I've been using one of these for years on my 2018 Roubaix with an 11/40 cassette and the shifting is great. Since I have two bikes that can use this derailleur, I decided to buy this one as a spare, since they can be hard to come by these days.

As an interesting historical aside, this was Shimano's first shot at a gravel derailleur. This identical derailleur would become part of the GRX groupset, just with a different label. So if you have GRX and want a spare, this is the way to go, as it's cheaper than guying the same derailleur with the GRX label.
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ng
5.0 out of 5 stars 使用して2年、安定しております
Reviewed in Japan on April 5, 2021
Color: GreySize: GS - mediumVerified Purchase
いまとなっては新しいラインナップが増え、スタビライザー付きのDI2の選択肢が多くなりました。
１１速は、マウンテン系のスプロケット位置のものと、ロード系のスプロケット位置のものがあります。ロード系のトップギヤ位置にはマウンテンでは対応できず、１速低い位置までスプロケット対応となります。逆に、ローギヤ側（歯数の多いほう）は、マウンテン系はロード系ディレーラーでは移動できないさらに１速下の位置までいどうします。大きいスプロケットに対応できるわけです。ちょうど１速分シフトした感じです。
このRX805は、ロード系のディレーラーでありながらスタビライザーのついた特殊なものになります。
一言でいうと、９速対応のホイールを持ったマウンテンやクロスなどの車種でもDI2が付けれるパターンを存在させて且つスタビライザーまで対応できる最終形ではないかと思います。
実際使ってみる限りは、スムーズなのは当然として、今現在　販売しているDI2スタビライザー付きの中では最軽量です。対応スプロケット範囲が狭いからとか、スプロケットがロードポジションゆえの構造のためですが。
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