Altus RD-M310 Rear Derailleur 7/8 Speed - Smooth Shifting for Bikes

In this review the Altus RD-M310 rear derailleur is presented as a practical upgrade for riders who need reliable shifting on 7/8 speed drivetrains. The single biggest reason to buy is its combination of lightweight construction and the RD-CT95 Altus technology, which together deliver smooth, predictable gear changes for everyday riding and light off-road use. The review focuses on real-world fit, ease of installation and adaptability rather than high-end race performance, making it clear who will benefit most from this component.

Key Features

• Multi-speed compatibility: Designed specifically for 7/8 speed systems, it ensures accurate indexing and crisp shifts on compatible drivetrains.
• RD-CT95 Altus technology: The internal design and geometry provide smoother chain movement and dependable performance during normal and mixed-terrain riding.
• Lightweight design: Reduced weight improves bike handling and responsiveness without compromising durability for casual and commuter use.
• Strong adaptability: With a maximum rear sprocket of 34T and 43T total capacity, it handles a broad range of cassette sizes common on mountain and city bikes.
• Direct mount installation: Direct installation to the derailleur hanger simplifies setup and avoids rack-mounted complications when the correct mount type is used.

Who It's For

The RD-M310 is best suited for leisure cyclists, commuters and light trail riders who run 7 or 8 speed drivetrains and want a reliable, low-weight rear derailleur that shifts well without a premium price. It appeals to riders replacing worn components or upgrading from generic parts for a noticeable improvement in shift feel.

It is not intended for riders seeking top-tier race-grade performance or for drivetrains with sprockets larger than the specified 34T maximum; those users should consider higher-capacity or competition-level derailleurs instead.

Pros & Cons

Pros

• Functionality: Shifts smoothly in everyday riding and light off-road conditions according to customers.
• Quality: Construction and RD-CT95 technology give reliable, consistent performance.
• Ease of installation: Direct mount design makes fitting straightforward for most standard hangers.
• Fit: Works well across a variety of bike types including mountain, road and folding bikes.

Cons

• Capacity limit: Maximum rear sprocket of 34T and 43T total capacity may be insufficient for riders who require very low gearing.

Specifications

Compatibility	7/8 speed drivetrains
Technology	RD-CT95 Altus
Maximum rear sprocket	34T
Total capacity	43T
Mount type	Direct mount
Applications	Mountain, road, racing, city, folding bikes

Our Verdict

The Altus RD-M310 is a practical, good-value rear derailleur for riders on 7/8 speed systems who want dependable shifting, an easy installation and modest weight savings. It is recommended for commuters, casual mountain bikers and anyone replacing worn components, while riders needing oversized sprocket capacity or elite race performance should look at higher-capacity options.

Frequently Asked Questions

Is this derailleur compatible with 8 speed cassettes?
Yes, the RD-M310 is built for both 7 and 8 speed systems and will work with standard 7/8 speed indexing.

What is the largest cassette cog it supports?
The derailleur supports a maximum rear sprocket of 34T and a total capacity of 43T.

Does it require a special mount or adapter?
It is a direct mount derailleur; ensure your frame or hanger accepts direct mount installation before purchase.