Shimano Alivio RD-M3100 Shadow 9 Speed Rear Derailleur
Shimano alivio rd-m3100-sgs long screed rear derailleur. Compatible with 9-speed shimano, microshift and btwin bike drive trains for smooth gear changes.
Shimano alivio rd-m3100-sgs long screed rear derailleur. Compatible with 9-speed shimano, microshift and btwin bike drive trains for smooth gear changes.
Shimano alivio rd-m3100-sgs long screed rear derailleur. Compatible with 9-speed shimano, microshift and btwin bike drive trains for smooth gear changes.
Shimano alivio rd-m3100-sgs long screed rear derailleur. Compatible with 9-speed shimano, microshift and btwin bike drive trains for smooth gear changes.
in 55 offers
The lowest price for Shimano Alivio RD-M3100 Shadow 9 Speed Rear Derailleur right now is $18.59 at AliExpress.com - AliExpress-226247430, compared across 39 retailers.
The all-time low was $7.95 on 19 Feb 2026 — today's price is 134% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 29 July 2026.
Last updated at 29/07/2026 21:56:53
Compatible for Shimano Bike Rear Derailleur ALIVIO M3100 9 Speed SGS RD-M3100 MTB
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Compatible for Shimano M3100 9S MTB Shifter & Rear Derailleur | Right shifter lever with SGS long cage rear derailleur
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
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Delivery $59.70
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originally posted on jensonusa.com
We had Shimano Alivio rear derailleur on our Trek 4300's since 2007.Ladies and Gentlemen, that's 15 years on the same rear derailleur!When I saw that the new Alivio Shadow version was installed in the 2 x 9 configuration on the Marin Palisades Trail 2 bike from Jenson USA, I considered it a bonus, and didn't hesitate to place my order. It is time tested, and while I understand the attraction and simplicity of the 1x front chainring, I still appreciate the wider range of gears available with the Alivio 9-speed setup for our mixed types of riding.I liked them so much, we turned around and ordered them on our two 2021 Marin Muirwoods 29ers. In our extended family, we run 12 separate Alivio rear derailleurs on various bikes so they must be pretty favorable around ... MoreWe had Shimano Alivio rear derailleur on our Trek 4300's since 2007.Ladies and Gentlemen, that's 15 years on the same rear derailleur!When I saw that the new Alivio Shadow version was installed in the 2 x 9 configuration on the Marin Palisades Trail 2 bike from Jenson USA, I considered it a bonus, and didn't hesitate to place my order. It is time tested, and while I understand the attraction and simplicity of the 1x front chainring, I still appreciate the wider range of gears available with the Alivio 9-speed setup for our mixed types of riding.I liked them so much, we turned around and ordered them on our two 2021 Marin Muirwoods 29ers. In our extended family, we run 12 separate Alivio rear derailleurs on various bikes so they must be pretty favorable around here.Smooth, reliable, quiet, easy to maintain...Alivio, is much like The Underdog Cartoon show from the 1960's. One minute "humble, loveable, shoeshine boy", the next, "There's no need to fear, Underdog is here!" But it's really just little old Alivio.
originally posted on halfords.com
I bought this to replace my knackered old derailleur which had excessive play, another review on here says it did not match his bike I cannot understand why as shimano replaced the rd 4000 mech with the 3100, they are mechanically identical from what I can see and mine fitted to my 2016 specialized crosstrail sport fine.If you're unsure take your old one off and tothe store for comparison that way you can get a refund etc if you open the box carefully with a staff member to check
originally posted on halfords.com
I used this for a 1x conversion on a 1990s MTB. The long cage works well with the 32t cassette and it was easy to set up. The derailleur has an extender from where it attaches to the drop out so it would also work well with cassettes above 32t. Delivered extremely quickly (next day) and good price.
| Speeds | 9 |
| Max. Capacity | 45T |
| High Sprocket (Max.) | 12T |
| High Sprocket (Min.) | 11T |
| Shipped Nationally | Yes |
Compatible for Shimano Bike Rear Derailleur ALIVIO M3100 9 Speed SGS RD-M3100 MTB
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Compatible for Shimano M3100 9S MTB Shifter & Rear Derailleur | Right shifter lever with SGS long cage rear derailleur
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
SHIMANO CUES U3020 9Speed Rear Derailleur Black 9S Authentic U4000 Series Mountain Bike Cycling
Delivery $15.17
SHIMANO Alivio SL-M3100 9S Right Shifter Lever RD-M3100 9S Rear Derailleur SGS 9 Speed For MTB
Delivery $18.21
SHIMANO ALIVIO M3100 Rear Derailleur SHADOW RD 9 Speed For MTB Bike Mountain Bike Original Parts 9
Delivery $59.70
We had Shimano Alivio rear derailleur on our Trek 4300's since 2007.Ladies and Gentlemen, that's 15 years on the same rear derailleur!When I saw that the new Alivio Shadow version was installed in the 2 x 9 configuration on the Marin Palisades Trail 2 bike from Jenson USA, I considered it a bonus, and didn't hesitate to place my order. It is time tested, and while I understand the attraction and simplicity of the 1x front chainring, I still appreciate the wider range of gears available with the Alivio 9-speed setup for our mixed types of riding.I liked them so much, we turned around and ordered them on our two 2021 Marin Muirwoods 29ers. In our extended family, we run 12 separate Alivio rear derailleurs on various bikes so they must be pretty favorable around ... MoreWe had Shimano Alivio rear derailleur on our Trek 4300's since 2007.Ladies and Gentlemen, that's 15 years on the same rear derailleur!When I saw that the new Alivio Shadow version was installed in the 2 x 9 configuration on the Marin Palisades Trail 2 bike from Jenson USA, I considered it a bonus, and didn't hesitate to place my order. It is time tested, and while I understand the attraction and simplicity of the 1x front chainring, I still appreciate the wider range of gears available with the Alivio 9-speed setup for our mixed types of riding.I liked them so much, we turned around and ordered them on our two 2021 Marin Muirwoods 29ers. In our extended family, we run 12 separate Alivio rear derailleurs on various bikes so they must be pretty favorable around here.Smooth, reliable, quiet, easy to maintain...Alivio, is much like The Underdog Cartoon show from the 1960's. One minute "humble, loveable, shoeshine boy", the next, "There's no need to fear, Underdog is here!" But it's really just little old Alivio.
I bought this to replace my knackered old derailleur which had excessive play, another review on here says it did not match his bike I cannot understand why as shimano replaced the rd 4000 mech with the 3100, they are mechanically identical from what I can see and mine fitted to my 2016 specialized crosstrail sport fine.If you're unsure take your old one off and tothe store for comparison that way you can get a refund etc if you open the box carefully with a staff member to check
I used this for a 1x conversion on a 1990s MTB. The long cage works well with the 32t cassette and it was easy to set up. The derailleur has an extender from where it attaches to the drop out so it would also work well with cassettes above 32t. Delivered extremely quickly (next day) and good price.
I bought this to upgrade my sons bike with a worn Shimano Tourney derailleur. The Alivio is considered the top derailleur for mountain/hybrid bikes at the consumer level (not pro). For the price it worked great as a replacement. Only thing I was a little disappointed in is that the pulley cage looked to be made of some metal stamping process. It is heavy and not much thought was put into the finish. There is some use of plastic too. That being said it does the job I expect it to. It shifts clean and precise without hunting between gears and everything runs smoothly. The long cage allows the use of tall 32+ teeth rear sprockets for easier climbing. Skip the Tourney/Acera models and go straight for this. There is very little difference in price, but the materials and ... MoreI bought this to upgrade my sons bike with a worn Shimano Tourney derailleur. The Alivio is considered the top derailleur for mountain/hybrid bikes at the consumer level (not pro). For the price it worked great as a replacement. Only thing I was a little disappointed in is that the pulley cage looked to be made of some metal stamping process. It is heavy and not much thought was put into the finish. There is some use of plastic too. That being said it does the job I expect it to. It shifts clean and precise without hunting between gears and everything runs smoothly. The long cage allows the use of tall 32+ teeth rear sprockets for easier climbing. Skip the Tourney/Acera models and go straight for this. There is very little difference in price, but the materials and performance is noticeable. If you have more money then by all means go for Deore LX, XT stuff but for a fixer upper that my son will likely outgrow in 2 years this is a bargain and cheap enough to replace again if needed.
Good value, jockey wheel nut was loose, probably derailleur was taken off a bike and jockey wheel was removed to do this. It caused problems with indexing gears until I realised. All good now though.
Needing more low gear range for the hills I bought an 11-34 cassette. Of course my aged ultegra short cage can't cope. A lot of Googling later it seems Shimano MTB 9 speed rear derailleurs match up. Early days, but seems fine, and I am loving the help on the hills.
I feel the quality if older version was far better, rest Shimano knows, although i am very happy and satisfied with the work of CYCLOP. Thank you CYCLOP for delivering the product to me.
After an accident on my bike ..... I bought this derailleur over a month ago price was good... I finally got round to fitting to my voodoo 29er fairly straight forward but alas can't seem to get it to run smooth in the last. 2 high gears (8th & 9th) so could have been more damage that first thought, so booked in with halfords see if they can see they can sort it
Used for an old 7-speed 90's MTB.... works well for the price.
I've upgraded to this Alivio a little earlier from Cycling Boutique for my earlier Acera RD. Enjoying this good piece of engineering. I am shredding the mud in the monsoons and this guy is handling all bad roads of Bengaluru very well, even on torrential rains.Quite robust spring is holding the cage very well on super bad roads around my areas.
| Speeds | 9 |
| Max. Capacity | 45T |
| High Sprocket (Max.) | 12T |
| High Sprocket (Min.) | 11T |
| Shipped Nationally | Yes |
