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Shimano Alivio RD-M3100-SGS Rear Derailleur: precision and a low profile for your MTB routes
The Shimano Alivio RD-M3100-SGS is a rear derailleur designed to deliver smooth, precise shifting, with a construction focused on durability and control during aggressive riding. Its low-profile design with Shimano Shadow RD technology helps reduce interruptions and improves overall performance under demanding use.
- Intended use: MTB
- Compatibility: 9-speed drivetrains
- Installation type: Direct Mount
- Special features: low-profile design, 45T total capacity, 36T max low sprocket, Shimano Shadow RD technology
Technical features
The Shimano Alivio RD-M3100-SGS rear derailleur is designed for riders looking for reliable, precise performance on mountain rides. Its approach combines a robust structure with a low-profile design that supports a cleaner, safer ride on demanding terrain.
Built to last and perform
Shimano developed this model with a focus on precision and durability. The result is a rear derailleur built to withstand ongoing use while maintaining consistent performance on every ride, helping to optimize the drivetrain in varied conditions.
Ready compatibility for 9-speed drivetrains
The RD-M3100-SGS is designed for 9-speed drivetrains, delivering stable operation within this setup. In addition, its total capacity of 45T and compatibility with a maximum low sprocket of 36T expand its use options for mountain-focused builds.
Direct Mount and low-profile design for a cleaner ride
Its Direct Mount system makes integration easier on compatible setups, while the low-profile design helps minimize interference while riding. This construction supports aggressive riding with fewer disruptions—especially useful on technical or uneven routes.
The advantage of Shimano Shadow RD in action
Shimano Shadow RD technology is one of the key features of this rear derailleur. Thanks to it, the unit maintains a more tucked-in, stable profile, improving drivetrain behavior and delivering a smoother, more precise shifting feel with every pedal stroke.
- Color
- Black
ERDM3100SGS
Product Availability
Most of our items are in stock and marked on the product page as "Available. Immediate shipping".
For items with size variations, this information will appear once the appropriate option is selected. If we do not have immediate stock, the estimated delivery time will be shown. We keep this information up to date and work hard to deliver your order as soon as possible. If the item is unavailable, you can subscribe to an alert to be notified once it’s back in stock.
Payment Methods
We accept card payments, PayPal, Klarna, Amazon Pay, among others. Once received and confirmed, we will process your order and begin preparation.
Shipping and Costs
We offer free shipping on most of our orders. For purchases over €100, shipping is free to countries such as Belgium, France, Germany, Luxembourg, the Netherlands, Portugal, and Spain. We do not ship to the Azores, Madeira, the Canary Islands, Reunion Island, or Guernsey..
Returns Policy
We want you to be completely satisfied with your purchase, so you have 30 days to return your order, as long as return conditions are met. You can find more information about exchanges and returns here. For hygiene and safety reasons, returns of unsealed and/or activated electronic products, food items, swimsuits, and wetsuits are not accepted. See details here.
Size Exchanges
For size-specific products, please refer to the size guide on the product page to choose the best fit. If you need a different size upon receipt of your order, you have up to 30 days to request a change. Follow the steps detailed here
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