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SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage

4.6 out of 5 stars 436 ratings
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£25.99 with 20 percent savings
RRP: £32.41
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Purchase options and add-ons

Brand SHIMANO
Colour Black
Material Alloy Steel, Aluminium
Item weight 200 Grams
Case material type Steel & Aluminum

About this item

  • Thanks to the very flat design and the optimised spring tension, a stop on the chain stay is prevented and even trail obstacles have hardly a chance to damage the rear derailleur.
  • Thanks to the very flat design and the optimised spring tension, a strike on the chain stay is prevented and even trail obstacles have hardly a chance of damaging the rear derailleur.
  • Rear Derailleur Mount Type: Shimano Rear Direct Mount , 10x1 Standard
  • The rear derailleur supports nine gear levels and the HyperGlide system, which protects the drive components from premature wear.
  • Super low profile Shadow RD technology
  • Shimano
  • Largest Cog: 36 Drivetrain Speeds: 9 Cage Length: Long
› See more product details

Frequently bought together

SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage
This item: SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage
£25.99
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Shimano Alivio SL-M3100 Alivio Shift Lever, 9-Speed, Band on, Right Hand,Black
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Sent from and sold by Amazon US.
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Product information

Technical Details

Mounting type ‎Clamp-On Mount
Number of teeth ‎45
Product dimensions ‎17L x 11W x 10H centimetres
Manufacturer ‎SHIMANO
UPC ‎192790621159
Bike type ‎Mountain Bike
Color ‎Black
Size ‎One Size
Style ‎Single
Weight ‎0.4 Kilograms
Material type ‎Alloy Steel, Aluminium
Number of items ‎1
Seasons ‎All-Season
Sport ‎Cycling
Included components ‎nothing
Batteries included? ‎No
Department ‎Unisex
Item model number ‎C8C086
ASIN ‎B08CGYD213

Additional Information

Date First Available 30 May 2020
Customer Reviews
4.6 out of 5 stars 436 ratings

4.6 out of 5 stars
Best Sellers Rank 3,546 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
2 in Bike Rear Dérailleurs
Is discontinued by manufacturer No

Warranty & Support

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SHIMANO,Black,ERDM3100SGS Alivio Alivio M3100 rear derailleur, 9-speed, Shadow design, SGS long cage

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    Customer reviews

    4.6 out of 5 stars
    436 global ratings

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    Customers say

    Customers find the derailleur well-made, reliable, and easy to install and re-index. They appreciate its functionality and consider it good value for money. The derailleur receives positive feedback for its shifting accuracy, with one customer noting its smooth gear change and another mentioning the adjustment barrel for easy tuning.

    AI-generated from the text of customer reviews

    Select to learn more

    4 customers mention ‘Build quality’4 positive0 negative

    Customers find the derailleur well made and reliable.

    "...Overall, I'm very impressed with the performance and durability of the Shimano Alivio RD-M3100 Rear Derailleur, and I would highly recommend it to..." Read more

    "Good quality item bought to replace older worn out one. Easy to install." Read more

    "...Very reliable, good value for money." Read more

    "...Well made, feels strong, smooth gear change, as advertised. Very happy" Read more

    4 customers mention ‘Functionality’4 positive0 negative

    Customers report that the derailleur works well.

    "...Overall, I'm very impressed with the performance and durability of the Shimano Alivio RD-M3100 Rear Derailleur, and I would highly recommend it to..." Read more

    "Replace shimano sora. It’s working well, but max with 36 T so good for gravel but useless for mountain" Read more

    "...This does the job on all counts and great shifting accuracy." Read more

    "Works well, no problems" Read more

    4 customers mention ‘Value for money’4 positive0 negative

    Customers find the derailleur to be good value for money.

    "Did the job at a great price. Great action" Read more

    "...Very reliable, good value for money." Read more

    "Arrived quickly at a good price." Read more

    "Value for money...." Read more

    3 customers mention ‘Ease of installation’3 positive0 negative

    Customers find the derailleur easy to install and re-index.

    "Good quality item bought to replace older worn out one. Easy to install." Read more

    "Replaced my broken rear derailleur like-for-like, easy to install and re-index. Very reliable, good value for money." Read more

    "...like for like replacement for my old derailleur and it was an easy job to swap over. Well made, feels strong, smooth gear change, as advertised...." Read more

    3 customers mention ‘Quality’3 positive0 negative

    Customers find the derailleur to be of good quality, with one mentioning it's an excellent original part.

    "Excellent original part" Read more

    "Great item..." Read more

    "Works well and good balue..." Read more

    3 customers mention ‘Shifting accuracy’3 positive0 negative

    Customers appreciate the derailleur's shifting accuracy, with one customer noting its reliable performance and another mentioning the adjustment barrel for easy tuning.

    "...low-profile design and Shadow RD technology, this derailleur provides smooth, reliable shifting while minimizing chain slap and damage from..." Read more

    "...This does the job on all counts and great shifting accuracy." Read more

    "...Well made, feels strong, smooth gear change, as advertised. Very happy" Read more

    Working very well
    5 out of 5 stars
    Working very well
    Replace shimano sora. It’s working well, but max with 36 T so good for gravel but useless for mountain
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    Top reviews from United Kingdom

    • The Tedster
      5.0 out of 5 stars Value for money
      Reviewed in the United Kingdom on 30 January 2025
      Style Name: SingleVerified Purchase
      Did the job at a great price. Great action
      Helpful
       Report
    • Mike Nightingale
      5.0 out of 5 stars Works well
      Reviewed in the United Kingdom on 28 March 2024
      Style Name: SingleVerified Purchase
      The Shimano Alivio RD-M3100 Rear Derailleur is an excellent choice for anyone looking to upgrade their 9-speed mountain bike's drivetrain. Featuring a sleek, low-profile design and Shadow RD technology, this derailleur provides smooth, reliable shifting while minimizing chain slap and damage from rocks.
      The 45-tooth total capacity and 36-tooth maximum low sprocket size make it compatible with a wide range of cassettes, while the adjustment barrel allows for easy tuning to achieve optimal shifting performance.
      Overall, I'm very impressed with the performance and durability of the Shimano Alivio RD-M3100 Rear Derailleur, and I would highly recommend it to anyone looking for a high-quality, reliable rear derailleur for their 9-speed mountain bike.
      4 people found this helpful
      Helpful
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    • Ste
      5.0 out of 5 stars Great item
      Reviewed in the United Kingdom on 28 March 2025
      Style Name: SingleVerified Purchase
      Great for my older MTB
      Helpful
       Report
    • Brian McDONALD
      5.0 out of 5 stars Shimano Rear Deraillier
      Reviewed in the United Kingdom on 24 December 2024
      Style Name: SingleVerified Purchase
      Good quality item bought to replace older worn out one. Easy to install.
      Helpful
       Report
    • slawek
      5.0 out of 5 stars Working very well
      Reviewed in the United Kingdom on 22 March 2025
      Style Name: SingleVerified Purchase
      Replace shimano sora. It’s working well, but max with 36 T so good for gravel but useless for mountain
      Customer image
      slawek
      5.0 out of 5 stars
      Working very well

      Reviewed in the United Kingdom on 22 March 2025
      Replace shimano sora. It’s working well, but max with 36 T so good for gravel but useless for mountain
      Images in this review
      Customer image
      2 people found this helpful
      Helpful
       Report
    • Simon R.
      5.0 out of 5 stars Good
      Reviewed in the United Kingdom on 17 March 2025
      Style Name: SingleVerified Purchase
      Excellent original part
      One person found this helpful
      Helpful
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    • Twiddley
      5.0 out of 5 stars Works well and good balue
      Reviewed in the United Kingdom on 20 January 2024
      Style Name: SingleVerified Purchase
      Bought to replace a damaged microshift, and needed a gear with a larger sprocket range. This does the job on all counts and great shifting accuracy.
      Helpful
       Report
    • Yufei Ren
      5.0 out of 5 stars Shimano - a trustworthy brand
      Reviewed in the United Kingdom on 23 May 2024
      Style Name: SingleVerified Purchase
      Replaced my broken rear derailleur like-for-like, easy to install and re-index. Very reliable, good value for money.
      Helpful
       Report

    Top reviews from other countries

    Translate all reviews to English
    • Didier
      5.0 out of 5 stars Shimano Alivio 9-Speed,
      Reviewed in France on 18 July 2024
      Style Name: SingleVerified Purchase
      En remplacement du dérailleur arrière Shimano Acera 9 vitesses.nickel
      Customer image
      Didier
      5.0 out of 5 stars
      Shimano Alivio 9-Speed,

      Reviewed in France on 18 July 2024
      En remplacement du dérailleur arrière Shimano Acera 9 vitesses.nickel
      Images in this review
      Customer imageCustomer image
      Report
    • Bill A.
      5.0 out of 5 stars Good derailure, very interesting design.
      Reviewed in the United States on 14 September 2023
      Style Name: SingleVerified Purchase
      This was an inexpensive Shimano Alvio class derailure system that I bought for my old Rans Nimbus long wheelbase recumbent. The freewheel is a Shimano 7 speed mega and I also changed out the shifter from a Revoshift to a Shimano trigger shifter.
      What surprised me was how close the derailure rides next to the wheel spokes. It never touched but I had to tie the cable tail back so I wouldn't touch the spokes.
      It shifts very well especially after changing out the old chain to a KMC 8 speed.
      Customer image
      Bill A.
      5.0 out of 5 stars
      Good derailure, very interesting design.

      Reviewed in the United States on 14 September 2023
      This was an inexpensive Shimano Alvio class derailure system that I bought for my old Rans Nimbus long wheelbase recumbent. The freewheel is a Shimano 7 speed mega and I also changed out the shifter from a Revoshift to a Shimano trigger shifter.
      What surprised me was how close the derailure rides next to the wheel spokes. It never touched but I had to tie the cable tail back so I wouldn't touch the spokes.
      It shifts very well especially after changing out the old chain to a KMC 8 speed.
      Images in this review
      Customer imageCustomer imageCustomer image
      Report
    • VICTOR
      5.0 out of 5 stars Muy bueno
      Reviewed in Spain on 27 September 2024
      Style Name: SingleVerified Purchase
      Va genial
      Report
    • Mattias Ytterström
      5.0 out of 5 stars Funkar bra👍
      Reviewed in Sweden on 11 August 2023
      Style Name: SingleVerified Purchase
      👍
      Report
    • Fabrizio La Causa
      5.0 out of 5 stars Ottimo cambio
      Reviewed in Italy on 14 December 2024
      Style Name: SingleVerified Purchase
      Utilizzato per sostituire lo stesso cambio presente nella bici Scott 24 di mio figlio. Funziona perfettamente
      Report