Best Budget Mountain Bike Derailleurs 2025

Your mountain bike needs a good derailleur to shift gears properly. But that doesn’t mean you must spend a lot. Many affordable derailleurs offer solid performance. They are great for everyday rides and light trails. This article lists the best budget derailleurs for mountain bikes. We’ve chosen ones with good reviews and helpful features. They’re easy to install and built to last. Whether you ride often or just on weekends, there’s an option for you. Let’s explore top picks that won’t hurt your wallet.

1. Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur

• Speed Compatibility: 6/7-speed

• Mount Type: Direct Mount

• Cage Length: Medium Cage (GS)

• Material: Alloy body with plastic components

The Inkesky RD-TZ31-GS is designed for riders who need a reliable replacement derailleur for their 6 or 7-speed mountain bikes. With its direct mount design, it’s compatible with most standard MTB frames. Its medium cage provides sufficient tension and chain capacity for casual trail rides, commuting, or even use on tricycles and cruiser bikes. The build quality reflects its price range—lightweight and functional, but not ideal for aggressive off-road use.

Installation is straightforward for users with some mechanical experience, and it aligns well with Shimano-compatible shifters. During testing, gear shifts were fairly smooth, though under load or steep climbs, it occasionally struggled. It’s an affordable option for budget-conscious cyclists who need a quick replacement. However, long-term durability and high-performance shifting might not be its strong suits.

Pros:

• Affordable for casual riders

• Easy to install on most frames

• Works well with Shimano components

• Lightweight for its class

Cons:

• Not suitable for aggressive trail use

• Shifting can be inconsistent under load

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2. Huazu RD-TZ31-A Rear Derailleur

• Speed Compatibility: 6/7-speed

• Mount Type: Direct or Hanger Mount

• Material: Alloy body with reinforced springs

• Compatibility: Shimano-style drivetrains

The Huazu RD-TZ31-A derailleur is a practical and versatile component that caters to 6 or 7-speed MTB and hybrid bikes. With dual mounting options (direct and hanger), it fits a wide range of frames, which is a bonus for DIY mechanics or cyclists replacing worn components. It mimics the Shimano TZ31 design closely, delivering reasonable shift performance at a low cost.

Shifting during standard riding is decently crisp, though you might notice occasional lag or misalignment on steeper gradients or under heavy pedaling. It’s a solid choice for budget builds or casual bikes where performance isn’t the top priority. The reinforced springs add tension and reduce chain slack better than expected at this price range.

Pros:

• Dual mounting flexibility

• Inexpensive and widely compatible

• Decent spring tension

• Great for hybrid or cruiser bikes

Cons:

• Not ideal for performance MTB use

• Occasional chain misalignment

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3. Relwears RD-TZ31A Rear Derailleur

• Speed Compatibility: 6/7-speed

• Mount Type: Direct or Hanger Mount

• Cage Length: Medium

• Compatibility: Mountain, Cruiser, and Tricycle bikes

The Relwears RD-TZ31A is a convenient derailleur that offers broad compatibility for commuter, cruiser, and mountain tricycle setups. Like other TZ31 models, it offers both direct and hanger mounting options, making it adaptable and easy to install. It provides satisfactory performance for flat and moderate terrains, suitable for daily or recreational cyclists.

The shifting is generally smooth when properly adjusted and aligned, although under stress, it might falter. Its affordability and ease of installation make it a favorite for basic bike repairs. While it lacks the refinement of higher-end derailleurs, it performs well within its limits and is a good fit for casual riders needing a dependable replacement.

Pros:

• Good for various bike types

• Simple to install and adjust

• Compatible with many 6/7-speed drivetrains

• Affordable replacement part

Cons:

• Not optimized for trail riding

• Build materials may wear faster

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4. Shimano Tourney RD-TY300-SGS Derailleur

• Speed Compatibility: 6/7-speed

• Mount Type: Direct Mount

• Cage Length: SGS (Long)

• Material: Durable steel and aluminum alloy

The Shimano Tourney RD-TY300-SGS is a standout in the entry-level derailleur market. With a long cage design and sturdy steel construction, it supports a wide gear range and is excellent for casual MTB riders, commuters, and leisure cyclists. It maintains Shimano’s legacy of reliable engineering even in its basic models, providing consistent shifting performance.

This derailleur delivers smoother shifts than most generic alternatives in its class. Whether you’re cruising flat roads or tackling mild trails, it handles gear changes without hesitation. The overall build quality ensures better longevity compared to other budget derailleurs, making it a smart long-term investment for entry-level cyclists.

Pros:

• Trusted Shimano reliability

• Smooth and consistent shifting

• Durable materials for extended use

• Works well with wide-range cassettes

Cons:

• Heavier than some cheaper alternatives

• Not suitable for 8-speed or higher setups

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5. Relwears RD-TY21B Rear Derailleur

• Speed Compatibility: 6/7-speed

• Mount Type: Direct or Hanger Mount

• Cage Length: Medium

• Compatible with MTB, tricycles, cruisers

The RD-TY21B from Relwears is an affordable and versatile derailleur targeted at casual cyclists who require a basic and functional drivetrain component. It supports both hanger and direct mount setups, providing adaptability across different bike frames. It is modeled after the Shimano TY21 series and suits multiple bike types including mountain, tricycle, and commuter bikes.

This derailleur does well in urban and light off-road environments. While not built for performance-level riding, it does offer decent shifting with minimal fuss when adjusted properly. It’s ideal for people repairing an older bike or creating a cost-effective commuter build. However, the plastic-heavy construction limits its longevity.

Pros:

• Dual mounting support

• Easy to align and install

• Works well on various bike types

• Budget-friendly

Cons:

• Plastic parts limit durability

• Lacks responsiveness for demanding terrain

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6. Huazu Altus RD-M310 Rear Derailleur

• Speed Compatibility: 7/8-speed

• Mount Type: Direct Mount

• Material: Alloy construction with polished finish

• Compatibility: Shimano Altus series drivetrains

The Huazu RD-M310 is modeled after Shimano’s Altus series and supports 7 to 8-speed setups, offering a noticeable upgrade from lower-end derailleurs. With a solid alloy build and precise spring mechanics, it provides sharper and more reliable shifting for trail and urban riding. This derailleur is well-suited for riders wanting better responsiveness on a budget.

Performance-wise, this unit stands out in its class. Shifts are clean and quick across the range, and chain tension is well maintained, reducing the chance of derailments. It’s an excellent value for intermediate cyclists or anyone upgrading from a basic Tourney or generic derailleur. Durability is also a plus, thanks to its robust design.

Pros:

• Crisp and accurate shifting

• Stronger build than entry-level models

• Compatible with 7/8-speed drivetrains

• Good for light trail use

Cons:

• Slightly pricier than basic models

• Installation requires precise alignment

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7. Relwears RD-TY200 Rear Derailleur

• Speed Compatibility: 6/7-speed

• Mount Type: Direct Mount

• Material: Steel and plastic composite

• Application: Mountain, cruiser, and commuter bikes

The RD-TY200 by Relwears is a direct mount derailleur designed for 6 and 7-speed drivetrains, making it a suitable replacement for lower-tier mountain or hybrid bikes. It provides the essential functionality for basic cycling needs, and its structure is inspired by the Shimano TY200 series. Its steel frame gives it a bit more durability than some plastic-heavy models.

Performance-wise, the RD-TY200 is fair—shifts are acceptable for flat terrain and short climbs, though you’ll notice a drop in efficiency during more demanding rides. It’s a viable option for riders who are not focused on technical terrain or racing. Maintenance is minimal, and it’s a practical pick for basic commuting or recreational use.

Pros:

• Simple and effective design

• Steel components offer reasonable durability

• Direct mount for easy installation

• Great for basic bike builds

Cons:

• Not for performance-oriented riders

• Shifting not very refined under load

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How to Choose the Best Budget Mountain Bike Derailleurs

Mountain biking is a thrilling outdoor sport that demands precision, control, and endurance. One of the most essential components of a mountain bike is its derailleur, the mechanism that moves the chain between gears to accommodate different terrains. While premium derailleurs offer top-tier performance, many riders — especially beginners and casual bikers — seek budget-friendly alternatives that deliver reliable performance without breaking the bank. Choosing the best budget mountain bike derailleur requires a balanced understanding of functionality, compatibility, and value.

In this article, we’ll guide you through everything you need to know to choose the best budget mountain bike derailleurs — from key features and types to top considerations and trusted brands.

What is a Derailleur?

A derailleur is a mechanical device used in multi-speed bicycles to shift the chain from one gear to another. There are two types of derailleurs on a mountain bike:

1. Front Derailleur – Moves the chain across the front chainrings.

2. Rear Derailleur – Shifts the chain across the rear cassette gears.

Budget-conscious riders often focus on the rear derailleur as it’s more critical for handling steep climbs and fast descents typically encountered on trails.

Why a Good Derailleur Matters

A derailleur’s role may seem simple, but its importance can’t be overstated. A quality derailleur ensures:

• Smooth gear shifting

• Improved ride efficiency

• Reduced chain drops

• Increased drivetrain longevity

If your derailleur isn’t performing properly, you’ll experience sluggish shifts, misalignment, or even chain slippage — all of which can turn an enjoyable ride into a frustrating one.

Key Factors to Consider When Choosing a Budget Derailleur

1. Compatibility with Your Drivetrain

One of the most crucial factors is compatibility. A derailleur must match the number of gears on your bike and be compatible with the shifter brand.

• Speed Compatibility: Derailleurs are made for specific gear ranges, such as 6-speed, 7-speed, 8-speed, etc. You can’t use a 9-speed derailleur with an 11-speed cassette.

• Shifter Matching: Shimano derailleurs work best with Shimano shifters, while SRAM derailleurs require SRAM shifters.

Always check the product specifications or consult your bike manufacturer.

2. Clutch Mechanism (Optional on Budget Models)

A clutch derailleur features a mechanism that keeps chain tension tight, reducing chain slap and preventing drops on rough trails. While not common in ultra-budget models, some affordable derailleurs now include clutch systems. If you’re an aggressive trail rider, investing in one might be worthwhile.

3. Cage Length

Derailleur cages come in three lengths:

• Short Cage (SS): Best for single-chainring setups (1x drivetrains).

• Medium Cage (GS): Versatile for 2x setups.

• Long Cage (SGS): Required for 3x drivetrains or wide-range cassettes.

Choose a cage length that matches your drivetrain to avoid chain slack or shifting issues.

4. Material and Build Quality

Even on a budget, build quality matters. Look for derailleurs made with sturdy aluminum components, as they offer better durability than cheap plastic options. Reinforced pivots and bushings also add longevity.

5. Weight (Optional for Budget Riders)

While pro riders obsess over weight, budget-focused mountain bikers can be more forgiving. That said, avoid unnecessarily heavy derailleurs that may slow you down or affect your ride dynamics.

6. Ease of Installation and Adjustment

Some derailleurs are designed with beginners in mind. Look for options with clear adjustment screws, cable routing guides, and user-friendly installation instructions.

Top Budget Derailleur Brands to Consider

1. Shimano

Shimano dominates the budget component market. Models like Tourney, Altus, and Acera are affordable, reliable, and easy to install. These are ideal for recreational riders and beginner mountain bikers.

• Shimano Tourney (TZ/TY) – Best for casual riders or kids’ bikes.

• Shimano Altus – Better shifting performance, good for entry-level trail riding.

• Shimano Acera/Alivio – A bit more expensive but excellent value for serious beginners.

2. MicroSHIFT

An underrated brand gaining traction, MicroSHIFT offers derailleurs with smooth shifting and solid performance. The Advent series is an excellent budget alternative to higher-end systems.

• MicroSHIFT Advent 1×9 – Includes clutch; performs well in trail conditions.

3. SRAM

While SRAM primarily focuses on mid to high-end products, older models like X3 and X4 offer decent performance at a reasonable price. They’re durable and offer consistent shifting, though slightly pricier than Shimano equivalents.

4. Ztto & Sensah (Off-Brands)

These lesser-known brands offer ultra-budget derailleurs. They may not have the same longevity or precise engineering as Shimano or SRAM, but they are usable for casual riding and short-term solutions.

Recommended Budget Rear Derailleurs

Here are a few top picks for budget-conscious riders:

Note: Prices may vary depending on retailer and availability.

Common Mistakes to Avoid

• Mismatched Components: Always match your derailleur to the correct shifter and cassette.

• Overpaying for Features: Don’t get lured into buying mid-range derailleurs if you’re a casual rider.

• Ignoring Setup Requirements: Incorrect installation or adjustment can ruin even the best derailleur’s performance.

• Underestimating Quality: The cheapest derailleur may cost you more in the long run due to frequent replacements.

Final Tips

• Buy from Reputable Sellers: To avoid counterfeit or substandard products.

• Check Reviews: Real-world feedback from users helps gauge performance and reliability.

• Consider the Whole Drivetrain: Sometimes upgrading the derailleur alone won’t improve shifting if the chain, cassette, or shifter is worn out.

• Test Before Trail Riding: Always fine-tune your derailleur and test it on flat ground before hitting challenging trails.

Conclusion

Choosing the best budget mountain bike derailleur is about striking the right balance between price, performance, and compatibility. Whether you’re upgrading an older bike, building a budget-friendly setup, or just starting out, there are plenty of reliable derailleurs that won’t stretch your wallet.

Stick to reputable brands like Shimano, MicroSHIFT, and SRAM when possible, and always ensure your chosen derailleur fits your drivetrain configuration. With the right choice, even budget mountain bikes can deliver smooth and dependable rides across all kinds of terrain.