---
product_id: 2629271
title: "Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310"
brand: "shimano"
price: "R1195"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Shimano"
url: https://www.desertcart.co.za/products/2629271-altus-mountain-bike-rear-derailleur-direct-mount-rdm310
store_origin: ZA
region: South Africa
---

# Direct mount, easy install 7/8-speed compatibility Fits up to 34T sprockets Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310

**Brand:** shimano
**Price:** R1195
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Shift into the future with Shimano Altus – where precision meets power!

## Quick Answers

- **What is this?** Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310 by shimano
- **How much does it cost?** R1195 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/2629271-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 with minimal tools—get riding faster without the hassle.
- • **Durable Shimano Build:** Engineered for quiet, reliable performance that withstands daily urban and off-road challenges.
- • **High Sprocket Clearance:** Accommodates large rear sprockets up to 34 teeth, perfect for custom builds and rugged rides.
- • **Pro-Level Adjustability:** Fine-tune your ride with adjustable limit screws and tension for flawless shifting every time.
- • **Seamless 7/8-Speed Shifting:** Experience smooth, precise gear changes tailored for city sport and youth MTB bikes.

## Overview

The SHIMANO Altus Mountain Bike Rear Derailleur (RDM310) is a robust, 7/8-speed direct mount component designed for city sport and youth mountain bikes. It supports large sprockets up to 34 teeth, offers quiet and precise shifting, and features easy installation with professional-grade adjustability. Trusted by riders for its durability and smooth performance, it’s a top choice for upgrading your bike’s drivetrain with Shimano reliability.

## Description

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

Review: Great value, easy to install. Shifts perfectly and quietly. - 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.
Review: Excellent derailleur for the money, especially with LARGE rear sprockets - I bought this derailleur to replace the stock unit on a beach cruiser that I converted into a motorbike. I needed something sturdy and, most importantly, with enough clearance to fit around the HUGE sprocket that I have on the bike (34 teeth). This unit fit the bill perfectly - only required some minor adjustment with the set screws and within 15 minutes I was back in action. The only thing I needed to do we steal a longer B-screw (the screw that determines how far the derailleur's upper flywheel sits from the cassette) from the old derailleur, because the screw that came with this one wasn't long enough. This is ONLY because my bike is a beast of customization and I needed to improvise - but the longer B-screw worked flawlessly. In case anyone else out there is attempting to build a shiftable motorbike, I highly recommend this rear derailleur. It's super easy to install, came properly tuned right out of the box, is very sturdy and solid when riding, and most importantly it fits over just about any sprocket size you might have in the back! They make a ridiculous 42-tooth sprocket which I'm going to try putting on this bike (because the clutch doesn't like taking off even with the 34T sprocket...) and I'm confident this derailleur will even work with that.

## Features

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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000FFGTK0 |
| Best Sellers Rank | #37,722 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #6 in Rear Bike Derailleurs |
| Brand Name | SHIMANO |
| Customer Reviews | 4.6 4.6 out of 5 stars (6,023) |
| Date First Available | April 18, 2006 |
| Global Trade Identification Number | 00689228130913 |
| Included Components | Rear Derailleur |
| Item Dimensions LxWxH | 3.75 x 4.25 x 6.5 inches |
| Item Package Dimensions L x W x H | 7.28 x 4.13 x 3.82 inches |
| Manufacturer | Shimano |
| Model Name | Shimano Altus Smart Cage Rear Derailleur |
| Number of Items | 1 |
| Package Weight | 0.41 Kilograms |
| Part Number | ERDM310DS |
| Product Dimensions | 10"L x 8"W x 2"H |
| Size | 7/8spd |
| Sport Type | Cycling |
| Style | Rear Derailleur |
| UPC | 689228130913 |
| Warranty Description | Limited Warranty |

## Product Details

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

## Images

![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.

### ⭐⭐⭐⭐⭐ Excellent derailleur for the money, especially with LARGE rear sprockets
*by M***. on July 25, 2014*

I bought this derailleur to replace the stock unit on a beach cruiser that I converted into a motorbike. I needed something sturdy and, most importantly, with enough clearance to fit around the HUGE sprocket that I have on the bike (34 teeth). This unit fit the bill perfectly - only required some minor adjustment with the set screws and within 15 minutes I was back in action. The only thing I needed to do we steal a longer B-screw (the screw that determines how far the derailleur's upper flywheel sits from the cassette) from the old derailleur, because the screw that came with this one wasn't long enough. This is ONLY because my bike is a beast of customization and I needed to improvise - but the longer B-screw worked flawlessly. In case anyone else out there is attempting to build a shiftable motorbike, I highly recommend this rear derailleur. It's super easy to install, came properly tuned right out of the box, is very sturdy and solid when riding, and most importantly it fits over just about any sprocket size you might have in the back! They make a ridiculous 42-tooth sprocket which I'm going to try putting on this bike (because the clutch doesn't like taking off even with the 34T sprocket...) and I'm confident this derailleur will even work with that.

### ⭐⭐⭐⭐⭐ Excellent derailleur
*by C***L on June 12, 2023*

Paired this with a Shimano Altus right side trigger shifter, 7 speed. Installed this onto a Mongoose Ardor due to the cheap Pro Rush derailleur binding the chain up real bad when hitting a small jump or bunny hopping a little higher than an inch. Like, the derailleur would skip the chain off one of the pulley cogs and it would stick between the metal guides and the cog. These two, once installed and tuned, are tuned to work perfectly with each other. My derailleur hanger was checked with my Park Tools DAG alignment tool, and the derailleur hanger wasn't really bent hardly at all, but it doesn't hurt to ensure good hanger alignment before installing any new equipment. This derailleur is working fine on the Pro Rush freewheel 7 speed gear set, since it's paired with its proper Shimano Altus shifter counterpart. That's where people mess up, is pairing a new derailleur like this Shimano with the older shifter like the Pro Rush that was on the bike. I'll update the review if the Shimano Altus just breaks or craps out, but the first ride out it shifted very very nicely, and even handled several little jumps with no chain slippage or binding. I just am not ready to upgrade the rear wheel to a free hub with higher than 7 speeds, so finding this derailleur and shifter combo worked out great. :)

## 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 South Africa*
*Store origin: ZA*
*Last updated: 2026-03-06*