Off-road adventures demand quality components, and few parts are as crucial as the derailleur. This often-overlooked piece dictates shifting performance, durability, and overall riding experience.
Selecting one of the best mountain bike derailleurs can significantly impact your time on the trail. A poorly chosen derailleur can lead to frustrating missed shifts, chain drops, and ultimately, mechanical failures far from home.
Investing in a reliable unit ensures smooth and precise gear changes, allowing you to conquer challenging climbs and navigate technical descents with confidence. This guide explores the key factors that differentiate the best mountain bike derailleurs, helping you find the optimal balance between performance and value for your specific riding style and budget.
IN THIS ARTICLE
Top 10 Best Mountain Bike Derailleurs Compared
🏆 BEST OVERALL Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount
- Improved shifting precision (direct mount)
- Enhanced durability (direct mount)
- Potentially quicker shifting
- More rigid connection to frame
4.6/5
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🥈 2ND RUNNER UP Relwears Altus RD-M310 Rear Derailleur 7/8 Speed B
- Compatible with 7/8 speed systems.
- Lightweight design potentially improves speed and maneuverability.
- Adaptable to various terrains with 34T max sprocket.
- Versatile application across multiple bike types.
4.5/5
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� BEST VALUE Relwears Tourney Rear Derailleur RD-TY300 6/7Speed
- Affordable price point
- Compatible with 6 and 7-speed systems
- Suitable for various bike types (MTB, hybrid, etc.)
- Easy to install
4.6/5
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Relwears Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount/Suspension Rear Derailleur for Mountain Bike Kids Bike Commuter Bike
- Durable aluminum alloy construction.
- Suitable for 6/7-speed drivetrains.
- Precise adjustment capabilities for accurate shifting.
- Quiet and smooth guide wheel operation.
4.5/5
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Huazu Rear Derailleur for RD-TZ31-A
- Compatible with 6/7 speed SIS index shifting systems.
- Constructed from aluminum and plastic alloys for durability.
- Clear specifications provided for capacity and sprocket size compatibility.
- Suitable for a range of bike types (mountain, road, folding).
4.8/5
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Front Bike Derailleurs 3 Speed Clamp On Front Dera
- Wide compatibility with 6-11 speed systems.
- Fits both 31.8mm and 34.9mm seat tubes with included adapter.
- Durable aluminum construction.
- Bidirectional cable arm supports various cable routing setups.
4.5/5
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Boao Universal Bicycle Transmission Line Bicycle S
- Comprehensive set including shift and brake cables.
- Durable PVC and stainless steel construction.
- Generous cable lengths can be cut to size.
- Includes various ferrules and end caps for complete installation.
4.4/5
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6/7 Speed Bike Rear Derailleur
- Compatible with 6 and 7-speed systems.
- Wide gear range (43T capacity) suitable for diverse terrains.
- Durable aluminum alloy construction.
- Versatile application for MTBs, gravel, and touring bikes.
4.7/5
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Rear Derailleur RD-TY21B 6/7 Speed Hanger Mount for Mountain
- Compatible with 6/7-speed systems.
- Made from durable aluminum alloy.
- Suitable for various bike types (MTB, commuter, cruiser, folding).
- Potentially offers good value as a replacement part.
4.6/5
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Shimano Tourney RD-TY300-SGS 6/7-Speed Mountain Bicycle Rear Derailleur
- Compatible with 6/7-speed systems
- SIS rear index shifting for decent performance
- SGS cage supports wide-range gearing (up to 34T)
- Durable 13-tooth pulleys
4.3/5
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Detailed Reviews of the Best Mountain Bike Derailleurs
Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount – Improved shifting precision (direct mount)
This direct mount rear derailleur is specifically designed for mountain bikes, offering a more rigid connection compared to traditional hanger-mounted derailleurs. This design aims to improve shifting precision and durability, especially in demanding off-road conditions. Installation requires a frame compatible with direct mount systems.
Ensure compatibility before purchasing, as it won’t fit standard derailleur hangers. The direct mount system can potentially offer quicker and crisper shifting, contributing to an enhanced riding experience on challenging trails. While offering performance benefits, it’s crucial to acknowledge that it’s a niche product intended for specific bike frames and riding styles.
Pros
- Improved shifting precision (direct mount)
- Enhanced durability (direct mount)
- Potentially quicker shifting
- More rigid connection to frame
Cons
- Requires a direct mount compatible frame (not universal)
- May be more difficult to install than hanger-mounted derailleurs
Relwears Altus RD-M310 Rear Derailleur 7/8 Speed B – Compatible with 7/8 speed systems.
The RD-M310 rear derailleur is presented as a compatible option for 7 and 8-speed bikes, incorporating Altus technology for a smoother ride. Its lightweight design aims to improve speed and handling, making it appealing for casual cyclists and urban commuters. The derailleur’s adaptability, with a maximum rear sprocket of 34T and total capacity of 43T, suggests versatility across different terrains.
Its suitability for various bike types, including mountain, road, and folding bikes, adds to its broader appeal. The direct installation method is designed for ease of use. Potential buyers should verify compatibility with their specific bike setup before purchasing, as with any component upgrade.
Pros
- Compatible with 7/8 speed systems.
- Lightweight design potentially improves speed and maneuverability.
- Adaptable to various terrains with 34T max sprocket.
- Versatile application across multiple bike types.
- Designed for easy, direct installation.
Cons
- Performance is positioned for everyday and light mountain biking, potentially limiting for aggressive riding.
- Compatibility needs verification prior purchase.
Relwears Tourney Rear Derailleur RD-TY300 6/7Speed – Affordable price point
The RD-TY300-SGS rear derailleur is a budget-friendly option for those using a 6 or 7-speed drivetrain on various types of bikes, including mountain, hybrid, and cruiser bikes. Its long cage design offers a total capacity of 43T and is compatible with 11T to 34T low sprockets. The derailleur is constructed from aluminum alloy, which should offer reasonable durability for its price point.
Installation is reportedly straightforward. Shifting performance is adequate for casual riding, but users seeking precision shifting for more demanding situations might want to consider higher-end alternatives. Overall, it appears to be a decent replacement part or starting point for basic bikes.
Pros
- Affordable price point
- Compatible with 6 and 7-speed systems
- Suitable for various bike types (MTB, hybrid, etc.)
- Easy to install
- Made of aluminum alloy for reasonable durability
Cons
- Shifting performance may not be optimal for demanding riding conditions.
- Long cage design may not be suitable for all frame geometries.
Relwears Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount/Suspension Rear Derailleur for Mountain Bike Kids Bike Commuter Bike – Durable aluminum alloy construction.
The RD-TZ31A rear derailleur is a hanger mount option designed for 6/7-speed drivetrains, making it suitable for a range of bikes like mountain bikes, folding bikes, and station wagons. The derailleur uses an aluminum alloy construction, which should provide decent durability for its intended use. The shifting performance is adequate and the adjustment mechanism allows for reasonably precise tuning, helping ensure accurate gear changes.
The guide wheels are made from PA nylon and aluminum alloy, promising quiet and smooth chain operation while resisting wear. Installation appears straightforward, but it’s crucial to verify the bike’s mount type before purchasing to ensure compatibility, as this is specifically a hanger mount derailleur.
Pros
- Durable aluminum alloy construction.
- Suitable for 6/7-speed drivetrains.
- Precise adjustment capabilities for accurate shifting.
- Quiet and smooth guide wheel operation.
- Easy installation and maintenance.
Cons
- Only compatible with hanger mount frames.
- May not offer the highest performance compared to more expensive derailleurs.
Huazu Rear Derailleur for RD-TZ31-A – Compatible with 6/7 speed SIS index shifting systems.
The RD-TZ31-A rear derailleur is designed as a replacement for 6/7-speed SIS index shifting systems. Constructed from a combination of aluminum and plastic alloys, it aims to offer a balance of durability and functionality. The provided specifications detail its capacity and compatible sprocket sizes, ensuring users can confirm its suitability for their existing drivetrain.
It’s important to note that this is a direct mount derailleur, so compatibility hinges on the frame having a derailleur hanger. It’s marketed for mountain bikes, road bikes, and folding bikes. Overall, it appears to be a budget-friendly option for those seeking a replacement derailleur for their compatible bike.
Pros
- Compatible with 6/7 speed SIS index shifting systems.
- Constructed from aluminum and plastic alloys for durability.
- Clear specifications provided for capacity and sprocket size compatibility.
- Suitable for a range of bike types (mountain, road, folding).
Cons
- Direct mount only; requires a derailleur hanger on the bike frame.
- Likely a budget-level component, so long-term durability may be a concern for heavy use.
Front Bike Derailleurs 3 Speed Clamp On Front Dera – Wide compatibility with 6-11 speed systems.
This front derailleur is designed for a wide range of mountain bikes and compatible with various speed configurations, from 6-speed to 11-speed systems. Its clamp-on design, coupled with the included conversion clip, allows it to fit both 31.8mm and 34.9mm diameter seat tubes, making it fairly versatile. The use of forged aluminum aims to balance weight and durability.
The product description emphasizes smooth operation and minimal wear. While seemingly compatible with many bike types, it is best suited for mountain bikes. It appears to be a solid, functional replacement part for a reasonable price, as long as it’s properly installed and adjusted.
Pros
- Wide compatibility with 6-11 speed systems.
- Fits both 31.8mm and 34.9mm seat tubes with included adapter.
- Durable aluminum construction.
- Bidirectional cable arm supports various cable routing setups.
Cons
- Clamp-on design may not be ideal for all frame types.
- Proper installation and adjustment are crucial for optimal performance.
Boao Universal Bicycle Transmission Line Bicycle S – Comprehensive set including shift and brake cables.
This bike shift derailleur and brake cable set provides a comprehensive collection of parts for replacing or maintaining your bicycle’s cable system. The cables are constructed from PVC and stainless steel, offering resistance to heat and rust, which suggests reasonable durability. The set includes ample cable housing and inner wires for both shifting and braking, along with various ferrules and end caps for a complete installation.
The provided lengths are generous and can be easily cut to the required size, accommodating different bike configurations. The inclusion of both front and rear cable options makes it versatile for various bicycle types. However, the double-headed brake cable might require trimming depending on your specific bike, adding a bit of extra work during installation.
Overall, a decent kit for bike maintenance.
Pros
- Comprehensive set including shift and brake cables.
- Durable PVC and stainless steel construction.
- Generous cable lengths can be cut to size.
- Includes various ferrules and end caps for complete installation.
- Suitable for mountain bikes, road bikes, and folding bikes.
Cons
- Double-headed brake cable may require trimming for some bikes.
- The quality of materials, while decent, might not be suitable for high-performance applications.
6/7 Speed Bike Rear Derailleur – Compatible with 6 and 7-speed systems.
The RD-TY300 rear derailleur offers compatibility with 6 and 7-speed SIS INDEX systems, making it a suitable replacement or upgrade for older bikes. Its 43T total capacity accommodates a wide gear range, particularly beneficial for riders tackling varied terrains. The aluminum alloy construction aims for durability, suggesting a reasonable lifespan even under challenging conditions.
Multi-speed compatibility extends to different bike types, making it versatile. While advertised for silent operation, real-world performance may vary. Installation is straightforward for those familiar with derailleur adjustments, but might require professional assistance for beginners.
Overall, a budget-friendly option for casual to moderate cycling.
Pros
- Compatible with 6 and 7-speed systems.
- Wide gear range (43T capacity) suitable for diverse terrains.
- Durable aluminum alloy construction.
- Versatile application for MTBs, gravel, and touring bikes.
- Direct mount for easy installation (for experienced users).
Cons
- “Silent operation” may not be entirely accurate in practice.
- Installation may require professional assistance for beginners.
Rear Derailleur RD-TY21B 6/7 Speed Hanger Mount for Mountain – Compatible with 6/7-speed systems.
The RD-TY21B rear derailleur is designed as a replacement part for 6/7-speed bicycles. Constructed from aluminum alloy, it aims to offer durable performance for a variety of bikes including MTBs, commuters, cruisers, and folding bikes. Installation appears straightforward, but it’s crucial to confirm that your bike uses a hanger mount, as this model is not compatible with direct mount systems.
Before purchasing, double-check your bike’s existing derailleur type to avoid compatibility issues. Overall, this derailleur seems like a decent budget-friendly option for those needing to replace a worn or damaged component on a compatible bike.
Pros
- Compatible with 6/7-speed systems.
- Made from durable aluminum alloy.
- Suitable for various bike types (MTB, commuter, cruiser, folding).
- Potentially offers good value as a replacement part.
Cons
- Only compatible with hanger mount frames, not direct mount.
- Performance may not be comparable to higher-end derailleurs.
Shimano Tourney RD-TY300-SGS 6/7-Speed Mountain Bicycle Rear Derailleur – Compatible with 6/7-speed systems
The Shimano TX35 rear derailleur is a functional and affordable option for 6/7-speed drivetrains. Designed for bracket attachment, it utilizes Shimano’s SIS rear index shifting technology for reasonably smooth gear changes. The SGS cage is a notable feature, providing compatibility with wider range gearing and up to 34-tooth sprockets, making it suitable for various terrains.
The 13-tooth pulleys contribute to a quieter ride and extended lifespan. Overall, this derailleur provides adequate performance for recreational cyclists or those looking for a budget-friendly replacement. While not as refined as higher-end derailleurs, it offers reliable shifting for its intended use.
Pros
- Compatible with 6/7-speed systems
- SIS rear index shifting for decent performance
- SGS cage supports wide-range gearing (up to 34T)
- Durable 13-tooth pulleys
- Affordable price point
Cons
- Bracket attachment might not suit all frame types
- Shifting performance may not be as precise as higher-end derailleurs
Buying Guide: What to Look For in a Best Mountain Bike Derailleurs
Understanding Mountain Bike Derailleurs
Mountain bike derailleurs are essential components of your bike’s drivetrain, responsible for shifting gears smoothly and efficiently. The rear derailleur moves the chain up and down the cassette sprockets, while the front derailleur (if present) handles shifting between chainrings. Choosing the best mountain bike derailleurs depends on your riding style, budget, and the number of gears your bike has. Understanding the different types and features will help you make an informed decision.
Key Features to Consider
When selecting the best mountain bike derailleurs, consider the following: Compatibility: Ensure the derailleur is compatible with your bike’s speed (e.g., 6/7-speed, 7/8-speed, 9-speed, etc.) and cassette/chainring size. Mount Type: Direct mount derailleurs offer a more rigid connection to the frame, potentially improving shifting precision and durability. Hanger mount derailleurs are more common. Cage Length: Longer cages accommodate wider gear ranges. Material: Aluminum alloy offers a good balance of durability and weight. Shifting Performance: Consider the shifting technology used, such as SIS (Shimano Index System), for smooth and reliable gear changes.
Matching Derailleurs to Riding Style and Budget
For casual riders and beginners, affordable options like the Relwears Tourney or Shimano Tourney series offer good value and reliable performance. More experienced riders or those tackling challenging terrain may benefit from higher-end derailleurs with enhanced durability and shifting precision. Consider your budget and how frequently you ride to determine the appropriate level of investment. Selecting the best mountain bike derailleurs is about finding the right balance of features and value for your specific needs.
Installation and Maintenance
Proper installation and regular maintenance are crucial for optimal derailleur performance. Ensure the derailleur is properly aligned and adjusted according to the manufacturer’s instructions. Regularly clean and lubricate the derailleur and cables to prevent dirt and grime buildup, which can affect shifting performance. Consider professional installation if you are not comfortable working on your bike’s drivetrain. Regular maintenance ensures the best mountain bike derailleurs continue to function smoothly.
Frequently Asked Questions about Best Mountain Bike Derailleurs
What is the difference between a direct mount and a hanger mount rear derailleur?
Direct mount derailleurs attach directly to the frame, creating a stiffer connection. This can lead to more precise shifting and increased durability. Hanger mount derailleurs attach to a replaceable hanger on the frame. If the hanger bends, the derailleur’s performance suffers, but the hanger can be replaced, protecting the frame. Direct mount derailleurs are often found on higher-end bikes, while hanger mount derailleurs are more common on entry-level and mid-range models. Both types can be considered as the best mountain bike derailleurs depending on the bike frame type.
How do I know which speed derailleur I need for my mountain bike?
The speed of your derailleur must match the number of sprockets on your cassette. For example, if your bike has a 7-speed cassette, you need a 7-speed derailleur. Using a derailleur with a different speed than your cassette will result in poor shifting performance. Check your bike’s specifications or count the number of sprockets on your cassette to determine the correct speed for your derailleur. Ensuring compatibility is crucial for achieving optimal shifting performance with the best mountain bike derailleurs.
What does ‘cage length’ mean, and why is it important?
The cage length refers to the distance between the derailleur’s pulleys. Longer cages are designed to accommodate larger cassettes and wider gear ranges. If you have a wide-range cassette (e.g., a large difference between the smallest and largest sprockets), you’ll need a long-cage derailleur to take up the chain slack. Using the wrong cage length can result in poor shifting or even damage to your drivetrain. Selecting the correct cage length is essential for smooth and efficient shifting with the best mountain bike derailleurs.
What is SIS (Shimano Index System), and how does it affect shifting?
SIS, or Shimano Index System, is a shifting technology that ensures precise and consistent gear changes. With SIS, each click of the shifter corresponds to a specific gear position, making shifting easier and more reliable. Derailleurs with SIS are designed to work seamlessly with Shimano shifters and cassettes. While other brands have similar indexed shifting technologies, SIS is a well-known and reliable system for achieving smooth and accurate gear changes with the best mountain bike derailleurs.
How often should I replace my mountain bike derailleur?
The lifespan of a mountain bike derailleur depends on several factors, including riding conditions, maintenance, and the quality of the derailleur. A well-maintained derailleur can last for several years, while a poorly maintained one may need to be replaced more frequently. Look for signs of wear, such as sloppy shifting, bent cage, or excessive play in the pivots. Regular cleaning and lubrication can extend the life of your derailleur and help you get the most out of the best mountain bike derailleurs.
Can I use a road bike derailleur on my mountain bike?
While it’s technically possible in some cases, it’s generally not recommended to use a road bike derailleur on a mountain bike. Mountain bike derailleurs are designed to handle the wider gear ranges and more demanding conditions of off-road riding. Road bike derailleurs typically have shorter cages and are not compatible with the larger cassettes commonly used on mountain bikes. Using the wrong type of derailleur can result in poor shifting and potential damage to your drivetrain. Selecting the best mountain bike derailleurs means choosing ones specifically designed for off-road use.
What are some common signs that my derailleur needs adjustment?
Common signs that your derailleur needs adjustment include: slow or hesitant shifting, chain skipping or jumping between gears, noisy shifting, and difficulty shifting into certain gears. These issues can often be resolved by adjusting the derailleur’s limit screws or cable tension. If you’re not comfortable making these adjustments yourself, it’s best to take your bike to a professional mechanic. Regular maintenance and adjustments can help prevent these issues and ensure smooth shifting with the best mountain bike derailleurs.
Are more expensive derailleurs always better?
While more expensive derailleurs often offer enhanced features and performance, they are not always necessary for every rider. Higher-end derailleurs typically have lighter weight, more durable materials, and more precise shifting mechanisms. However, for casual riders or those on a budget, mid-range derailleurs can provide excellent performance at a more affordable price. Consider your riding style, budget, and performance needs when choosing the best mountain bike derailleurs.
What tools do I need to install or adjust a mountain bike derailleur?
To install or adjust a mountain bike derailleur, you’ll typically need: a set of Allen wrenches, a Phillips head screwdriver, a cable cutter, and possibly a chain tool. A derailleur alignment gauge can also be helpful for ensuring proper alignment. Refer to the manufacturer’s instructions for specific tool requirements. Having the right tools will make the installation and adjustment process easier and more efficient when working with the best mountain bike derailleurs.
How can I keep my mountain bike derailleur clean and well-lubricated?
Regular cleaning and lubrication are essential for maintaining optimal derailleur performance. Use a degreaser to remove dirt and grime from the derailleur and chain. Rinse with water and allow to dry completely. Apply a chain lubricant to the chain and pivots of the derailleur. Wipe off any excess lubricant to prevent dirt buildup. Avoid using excessive amounts of lubricant, as this can attract dirt and grime. Regular cleaning and lubrication will help extend the life of your derailleur and ensure smooth shifting with the best mountain bike derailleurs.
Conclusion: The Final Verdict
The Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount this direct mount derailleur offers potential performance improvements for mountain bikers with compatible frames. if you have a direct mount frame and are looking for enhanced shifting, this is worth considering, but double-check compatibility before buying.
