---
product_id: 2629271
title: "SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310"
brand: "shimano"
price: "€ 55.31"
currency: EUR
in_stock: true
reviews_count: 7
url: https://www.desertcart.it/products/2629271-shimano-altus-mountain-bike-rear-derailleur-direct-mount-rdm310
store_origin: IT
region: Italy
---

# Direct mount for easy installation 7/8-speed precision shifting MTB-style durability for urban & trail SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310

**Brand:** shimano
**Price:** € 55.31
**Availability:** ✅ In Stock

## Summary

> ⚡ Shift into the fast lane with Shimano Altus precision!

## Quick Answers

- **What is this?** SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310 by shimano
- **How much does it cost?** € 55.31 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/2629271-shimano-altus-mountain-bike-rear-derailleur-direct-mount-rdm310)

## Best For

- shimano enthusiasts

## Why This Product

- Trusted shimano brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Direct Mount Design:** Simplifies installation and enhances frame compatibility for a sleek setup.
- • **MTB-Grade Durability:** Built tough for city streets and rugged trails alike—ride with confidence.
- • **Lightweight & Compact:** Optimized dimensions (4.25"L x 3.75"W x 6.5"H) keep your bike agile without bulk.
- • **Trusted Shimano Quality:** Backed by a limited warranty and Shimano’s legacy of precision engineering.
- • **Seamless 7/8-Speed Shifting:** Experience smooth, reliable gear changes that keep you ahead on every ride.

## Overview

The Shimano Altus RD-M310 rear derailleur offers reliable 7/8-speed shifting with a direct mount design, engineered for both city sport and youth mountain bikes. Compact and durable, it delivers smooth gear transitions and easy installation, backed by Shimano’s trusted quality and limited warranty.

## Description

ALTUS is a 7/8-speed MTB-style component group for city sport and youth bikes.

## Features

- Shimano RD-M310 (RD-CT95) Altus Rear Derailleur 7/8 Speed / D-ATT Silver

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 4.25"L x 3.75"W x 6.5"H |
| Manufacturer | Shimano |
| UPC | 689228130913 |
| Global Trade Identification Number | 00689228130913 |
| Item Package Dimensions L x W x H | 7.28 x 4.13 x 3.82 inches |
| Package Weight | 0.41 Kilograms |
| Item Dimensions  LxWxH | 3.75 x 4.25 x 6.5 inches |
| Brand Name | SHIMANO |
| Warranty Description | Limited Warranty |
| Model Name | Shimano Altus Smart Cage Rear Derailleur |
| Number of Items | 1 |
| Part Number | ERDM310DS |
| Style | Rear Derailleur |
| Included Components | Rear Derailleur |
| Size | 7/8spd |
| Sport Type | Cycling |

## Product Details

- **Brand:** SHIMANO
- **Color:** Silver
- **Material:** Metal
- **Item Weight:** 0.01 Ounces
- **Mounting Type:** Braze-On Mount

## Images

![SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310 - Image 1](https://m.media-amazon.com/images/I/61hsxrhAzQL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Will this model work on my 5 speed mountain bike? Thanks**
A: Actually, it should work fine.  As someone else stated, the spacing is different between 7 and 5 speed indexing, BUT it is the shifter that does the indexing, NOT the derailluer. So as long as you have the correct shifter on your handle bars or downtube, this should work.  The reason the spacing is different is because manufacturers used different chain thicknesses and closer spacing to match as they added more gears within the same basis space.  The rear cassette is about the same width between a 5 speed and a 10 speed, the individual cogs are just closer together the more speeds you have.  The indexing is handled by the shifter... so if you wish to convert from 5 speed to more in the rear, the parts that change are the shifter at the front and the chain when you go from 5 to 6/7/8, then again to 9 and again to 10.  I recently converted a recumbent trike from 7 to 10 speeds in the rear using a Sunrace freewheel and KMC 10-speed chains with MicroShift bar-end 10 speed shifters using a Shimano 9 speed rear derailleur. Shifts great.  Only reason I changed the rear derailleur out was due to slop in the 7 speed one that made it not shift or skip shift in certain gears.  I used this on my son's hybrid mountain bike for the same reason and it shifts great.

**Q: is this a sis derailer?**
A: This is a shimano altus  rear derailed

**Q: Is the cable adjuster a fastener (using wrench) or a hex screw (using allen key)?**
A: It's a hex screw.  We will update the image

**Q: Anyone know if this will work with friction shifter?**
A: Yes, friction shifters are a basic shifter equipped on many bikes as long as they are in working order, cables not seized and move freely inside cable housing. This works on old and new bikes regardless of its year as long as the bike has 7 or 8 speed cassettes that would be multiple cogs or sprockets , they have been called attached to the rear wheel.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great value, easy to install. Shifts perfectly and quietly.
*by J***V on October 8, 2024*

A great derailleur for the price, shifts perfectly and quietly and is totally silent while operating on all sprockets. It is easy to install with a just a few allen wrenches, I didn't bother taking apart the chain, I just disassembled the cage slightly to get the chain inside it. Adjusting was slightly more difficult. The only issue is that there are no paper instructions for installation and especially ADJUSTING it. It is essential to adjust the low and the high limits to align the upper jockey wheels and chain with the low and high sprockets, THEN just as importantly, when derailleur is on smallest sprocket remove ALL slack on the cable by pulling the cable tight when the cable attachment bolt is loose, then retightening the bolt, and/or by screwing the cable adjustment barrel until the derailleur just starts to move inward to the next gear. Maximum rear sprocket size is supposedly 34 tooth, and I found it best the adjust the B tension screw inward quite a bit (the one on the bracket that limits the derailleur front and back swivelling) to help the upper jockey wheel clear the larger sprocket (28 tooth in my case) better. Once installed and adjusted, it worked PERFECTLY every time.

### ⭐⭐⭐⭐⭐ Unbelievable quality for the price. Easy install.
*by I***I on August 13, 2025*

Having a problem adjusting the gears but that's my problem not Shimano's. Fit easily, looks great, and a new Shimano quality derailleur for < $17 is a very compelling to change your old one out like I did.

### ⭐⭐⭐⭐⭐ Installation was quick and easy.  It works perfectly.
*by E***B on July 16, 2025*

Installation was quick and easy. It works perfectly and shifts smoothly. At only $17, it is hard to believe that Shimano has a lower tier groupset (Tourney). This rear derailleur works as it should. For this price, there is no need to even try and wrench on your old/bent/beat up one... just replace it! When you do, toss the old one because you will never need it for parts. Just buy another if/when the time comes.

## Frequently Bought Together

- SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310
- Shimano FD-M310 Aultus Front Derailleur (28.6-34.9-mm 3x7/8 Speed Low-Clamp)
- SHIMANO HG40 116 W/CL Chain - Grey, 6/7/8 Speed

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-22*