Rear derailleur is something I’d never thought I’d say outloud. However, if you’ve been moutain biking for any length of time you’ve probably had to adjust the mountain bike derailleurs. What’s a derailleur you might ask! It’s a fancy sounding name for the thing that adjusts the it’s position to keep the tension on the chain as you change gears. If you’re bike cost under $1,000 you probably need to upgrade that mountian bike derailler. Just like our review of chain tensioners, you’ll find that there are a plethora of choices when you want to select the best mountain bike derailleur. You can purchase a decent bike frame from a local store and then upgrade the parts and have a pretty solid mountain bike.
Best Mountain Bike Derailleurs
What you will learn in this Article
Bestseller No. 1 
Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount, Medium Cage, for Mountain Bike
- [IMPORTANT] It's Direct Mount Rear Derailleur for Mountain Bike, not Hanger mount
$16.38 
Buy on Amazon SaleBestseller No. 2 
MEGHNA RD-TY300 6/7 Speed Rear Derailleur for Hybrid Bike Folding Bike Mountain Bike Tricycle E-Bike Direct Mount
- Model: RD-TY300-SGS; Bike Rear Derailleur 6/7 Speed for most kinds of bikes like mountain bike, hybrid bike, kids bike, cruiser bike etc.
- Features: Smooth shifting, easy and fast to install. Bracket fit (under wheel nut) Long cage tourney derailleur, total capacity 43T, pulley/Teeth 13/13T. Low sprocket: Max. 34T; Low sprocket: Min. 28T; Top sprocket: Max. 14T; Top sprocket: Min. 11T.
- Stability: Made of high quality durable aluminum alloy material and come with excellent shifting performance ensure your safe and stable while riding.
- Application: Compatible with 6 and 7-speed SIS INDEX variable speed transmission systems. Suitable for MTB, mountain bikes, road bikes, folding bicycles, commuter bikes, tricycles, eletric bikes etc.
- Type: Long cage tourney derailleur, compatible with 11T /14T high speed gear.
$13.99
Buy on Amazon SaleBestseller No. 3 
Huazu Rear Derailleur for RD-TZ31-A, Bike Parts Gear Shifter with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles
- MODEL: RD-TZ31-A bike rear derailleur, Compatible with GS 6 / 7 speed SIS Index Shifting drivetrains.
- STABILITY: Durable aluminum alloy and plastic alloy material, Providing excellent shifting performance ensure safe and stable.
- PARM: Total capacity 34T, Largest sprocket 28T, Smallest sprocket 14T, Front chain wheel tooth difference 20T.
- NOTE: The bike rear derailleur is direct mount, not hub bolt mount. Please check the mount type of the original part before ordering, if bike frame with hook, as picture shows, you can use it.
- COMPATIBILITY: Suitable for mountain bikes, road bikes, folding bicycles and so on.
$15.99
Buy on Amazon Bestseller No. 4 
Shimano RDM310DL Altus GS 7/8-speed Rear Der Black,Long Cage
- Chain Wrap Capacity: 43teeth, Derailleur Action: Top-Normal (Traditional)
- Derailleur Color: black, Drivetrain Spacing: Shimano/SRAM 8, Largest Cog: 34teeth
- Shifter/Rear Derailleur : Shimano, Speeds: 8sp, Weight: 326g
Bestseller No. 5 
Huazu Altus Rear Derailleur for RD-M310 7/8 Speed for Mountain Bike Direct Mount
- MODEL: RD-M310 Altus Rear Derailleur for Compatible with 7/8 Speed / D-ATT Black.
- EXCELLENT PERFORMANCE: Wide link design ensures durability and precise shifting. Large guide wheel design reduces noise and wear.
- PARM: Max Rear Sprocket: 34T, Total Capacity: 43T, Derailleur Action: Top Normal (Traditional), Cage Length: Long.
- DIRCT MOUNT: Altus rear derailleurs for are direct mount, suitable for mountain bikes, road bikes, folding bikes and so on.
- FEATURES: Advanced light-action design Teflon-coated bushings Direct-attach rear derailleurs.
$17.99
Buy on Amazon SaleBestseller No. 6 
Shimano Tourney TY500 6/7-Speed Rear Derailleur
- Shimano Tourney Rear derailleur compatible with all Shimano 6 and 7 speed shifters. Advanced light action design
- SGS cage can handle wide range gearing. Direct fit (screws into hole in frame).
- SIS Rear index shifting. 13 tooth pulleys offer long service life and less noise.
$16.43
Buy on Amazon SaleBestseller No. 7 
Bike Rear Derailleur RD-TY21B 6/7 Speed Direct Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike
- MODEL: RD-TY21B; Bike rear derailleur is compatible with 6/7 speed most kinds of bikes.
- PERFORMANCE: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- WIDE APPLICATION: This bicycle transmission is Suitable for MTB, mountain bikes, commuter bike, cruiser bike, folding bike etc.
- NOTE: The bike rear derailleur is Direct mount, not Hanger mount .Please check the mount type of the original part before purchasing. If you have any questions, please feel free to contact us, we will provide you with professional services.
$17.59
Buy on Amazon SaleBestseller No. 8 
Sunrace Sgs Rear Friction Derailleur w/Braket: Rdm10, Silver
- Friction derailleur
- Affordable replacement
- Wrap: 35
- Cage/Mount: Long w/Hgr
- Ratio: 2to1
Bestseller No. 9 
THALOUS Bicycle Rear Derailleur 6/7/8 Speed Tourney RD-TY300 RD-TX800 Altus RD-M310 for MTB Bike Direct Mount
- MODEL: Bicycle rear derailleur Altus RD-M310, suitable for 7-speed and 8-speed SIS index variable speed drives
- Direct installation: Before purchasing, please confirm whether the rear derailleur of your bicycle is directly installed or hook mounted
- High-quality material: This bicycle rear derailleur is made of high-quality Aluminium alloy, sturdy and durable, not easily deformed and not easily damaged.
- Wide application: This bicycle transmission is suitable for variable speed bikes, such as mountain bikes, road bikes, racing bikes, city bikes, folding bikes, etc. Is a good helper for your riding.
- Professional customer service: If you have any questions about our products or services, please feel free to contact us, we will provide you with professional services.
$28.98
Buy on Amazon SaleBestseller No. 10 
Huazu Rear Derailleur 6/7-Speed for Tourney RD-TY300 Mountain Bikes-Smooth Shifting Direct Mount Design
- Optimal Performance: Long cage design accommodates up to 34T cassette - Total Capacity 43T, pulley/Teeth 13/13T.
- Built to Last: High-Quality Aluminum Alloy Construction with Hollow Weight-Reduction Design. Nylon wear-resistant aluminum alloy guide wheel for silent, smooth, and non-wearing chain.
- Smooth and Effortless Shifting: SIS Index Technology and Double Servo-Panta Mechanism(Enables the rear derailleur to move in an optimum path)for Stress-Free Riding
- Precise and Reliable: Compatible with 6 and 7-speed SIS INDEX transmission systems. Optimized guide pulley ensures precise shifting for accurate SIS performance. Suitable for Mountain, Road, and Touring Bikes.
- Easy Installation and Maintenance: Direct Mounting Design for Fast and Convenient Setup.It can be adjusted slightly in multiple places to ensure accurate speed change performance.
$15.99
Buy on AmazonBestselling Mountain Bike Rear Derailleurs
Bestseller No. 1
Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount, Medium Cage, for Mountain Bike
- [IMPORTANT] It's Direct Mount Rear Derailleur for Mountain Bike, not Hanger mount
$16.38
Buy on Amazon SaleBestseller No. 2
MEGHNA RD-TY300 6/7 Speed Rear Derailleur for Hybrid Bike Folding Bike Mountain Bike Tricycle E-Bike Direct Mount
- Model: RD-TY300-SGS; Bike Rear Derailleur 6/7 Speed for most kinds of bikes like mountain bike, hybrid bike, kids bike, cruiser bike etc.
- Features: Smooth shifting, easy and fast to install. Bracket fit (under wheel nut) Long cage tourney derailleur, total capacity 43T, pulley/Teeth 13/13T. Low sprocket: Max. 34T; Low sprocket: Min. 28T; Top sprocket: Max. 14T; Top sprocket: Min. 11T.
- Stability: Made of high quality durable aluminum alloy material and come with excellent shifting performance ensure your safe and stable while riding.
- Application: Compatible with 6 and 7-speed SIS INDEX variable speed transmission systems. Suitable for MTB, mountain bikes, road bikes, folding bicycles, commuter bikes, tricycles, eletric bikes etc.
- Type: Long cage tourney derailleur, compatible with 11T /14T high speed gear.
$13.99
Buy on Amazon SaleBestseller No. 3
Huazu Rear Derailleur for RD-TZ31-A, Bike Parts Gear Shifter with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles
- MODEL: RD-TZ31-A bike rear derailleur, Compatible with GS 6 / 7 speed SIS Index Shifting drivetrains.
- STABILITY: Durable aluminum alloy and plastic alloy material, Providing excellent shifting performance ensure safe and stable.
- PARM: Total capacity 34T, Largest sprocket 28T, Smallest sprocket 14T, Front chain wheel tooth difference 20T.
- NOTE: The bike rear derailleur is direct mount, not hub bolt mount. Please check the mount type of the original part before ordering, if bike frame with hook, as picture shows, you can use it.
- COMPATIBILITY: Suitable for mountain bikes, road bikes, folding bicycles and so on.
$15.99
Buy on Amazon Bestseller No. 4
Shimano RDM310DL Altus GS 7/8-speed Rear Der Black,Long Cage
- Chain Wrap Capacity: 43teeth, Derailleur Action: Top-Normal (Traditional)
- Derailleur Color: black, Drivetrain Spacing: Shimano/SRAM 8, Largest Cog: 34teeth
- Shifter/Rear Derailleur : Shimano, Speeds: 8sp, Weight: 326g
Bestseller No. 5
Huazu Altus Rear Derailleur for RD-M310 7/8 Speed for Mountain Bike Direct Mount
- MODEL: RD-M310 Altus Rear Derailleur for Compatible with 7/8 Speed / D-ATT Black.
- EXCELLENT PERFORMANCE: Wide link design ensures durability and precise shifting. Large guide wheel design reduces noise and wear.
- PARM: Max Rear Sprocket: 34T, Total Capacity: 43T, Derailleur Action: Top Normal (Traditional), Cage Length: Long.
- DIRCT MOUNT: Altus rear derailleurs for are direct mount, suitable for mountain bikes, road bikes, folding bikes and so on.
- FEATURES: Advanced light-action design Teflon-coated bushings Direct-attach rear derailleurs.
$17.99
Buy on Amazon SaleBestseller No. 6
Shimano Tourney TY500 6/7-Speed Rear Derailleur
- Shimano Tourney Rear derailleur compatible with all Shimano 6 and 7 speed shifters. Advanced light action design
- SGS cage can handle wide range gearing. Direct fit (screws into hole in frame).
- SIS Rear index shifting. 13 tooth pulleys offer long service life and less noise.
$16.43
Buy on Amazon SaleBestseller No. 7
Bike Rear Derailleur RD-TY21B 6/7 Speed Direct Mount Derailleur for Mountain Bike Tricycle Commuter Bike Cruiser Bike
- MODEL: RD-TY21B; Bike rear derailleur is compatible with 6/7 speed most kinds of bikes.
- PERFORMANCE: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- WIDE APPLICATION: This bicycle transmission is Suitable for MTB, mountain bikes, commuter bike, cruiser bike, folding bike etc.
- NOTE: The bike rear derailleur is Direct mount, not Hanger mount .Please check the mount type of the original part before purchasing. If you have any questions, please feel free to contact us, we will provide you with professional services.
$17.59
Buy on Amazon SaleBestseller No. 8
Sunrace Sgs Rear Friction Derailleur w/Braket: Rdm10, Silver
- Friction derailleur
- Affordable replacement
- Wrap: 35
- Cage/Mount: Long w/Hgr
- Ratio: 2to1
Bestseller No. 9
THALOUS Bicycle Rear Derailleur 6/7/8 Speed Tourney RD-TY300 RD-TX800 Altus RD-M310 for MTB Bike Direct Mount
- MODEL: Bicycle rear derailleur Altus RD-M310, suitable for 7-speed and 8-speed SIS index variable speed drives
- Direct installation: Before purchasing, please confirm whether the rear derailleur of your bicycle is directly installed or hook mounted
- High-quality material: This bicycle rear derailleur is made of high-quality Aluminium alloy, sturdy and durable, not easily deformed and not easily damaged.
- Wide application: This bicycle transmission is suitable for variable speed bikes, such as mountain bikes, road bikes, racing bikes, city bikes, folding bikes, etc. Is a good helper for your riding.
- Professional customer service: If you have any questions about our products or services, please feel free to contact us, we will provide you with professional services.
$28.98
Buy on Amazon SaleBestseller No. 10
Huazu Rear Derailleur 6/7-Speed for Tourney RD-TY300 Mountain Bikes-Smooth Shifting Direct Mount Design
- Optimal Performance: Long cage design accommodates up to 34T cassette - Total Capacity 43T, pulley/Teeth 13/13T.
- Built to Last: High-Quality Aluminum Alloy Construction with Hollow Weight-Reduction Design. Nylon wear-resistant aluminum alloy guide wheel for silent, smooth, and non-wearing chain.
- Smooth and Effortless Shifting: SIS Index Technology and Double Servo-Panta Mechanism(Enables the rear derailleur to move in an optimum path)for Stress-Free Riding
- Precise and Reliable: Compatible with 6 and 7-speed SIS INDEX transmission systems. Optimized guide pulley ensures precise shifting for accurate SIS performance. Suitable for Mountain, Road, and Touring Bikes.
- Easy Installation and Maintenance: Direct Mounting Design for Fast and Convenient Setup.It can be adjusted slightly in multiple places to ensure accurate speed change performance.
$15.99
Buy on AmazonTop Shimano Mountain Bike Derailleurs
Bestseller No. 1
Shimano RDM310DL Altus GS 7/8-speed Rear Der Black,Long Cage
- Chain Wrap Capacity: 43teeth, Derailleur Action: Top-Normal (Traditional)
- Derailleur Color: black, Drivetrain Spacing: Shimano/SRAM 8, Largest Cog: 34teeth
- Shifter/Rear Derailleur : Shimano, Speeds: 8sp, Weight: 326g
SaleBestseller No. 2
Shimano Tourney TY500 6/7-Speed Rear Derailleur
- Shimano Tourney Rear derailleur compatible with all Shimano 6 and 7 speed shifters. Advanced light action design
- SGS cage can handle wide range gearing. Direct fit (screws into hole in frame).
- SIS Rear index shifting. 13 tooth pulleys offer long service life and less noise.
$16.43
Buy on Amazon Bestseller No. 3 
Shimano Rear Derailleur, RD-TX800, 7/8 SPD, Direct Attach, Bla
- TX models come with Smart Cage which gives MegaRange compatibility with a shorter derailleur cage
- Largest Cog: 34
- Chain Wrap Capacity: 43
- Cage Length: Long
- Drivetrain Speeds: 8
$18.73
Buy on Amazon Bestseller No. 4 
Shimano RD 5701 105 30T Max Rear Derailleur, Black, Medium Cage
- Capable of handling up to a 30t maximum cassette size
- Extra stiff for crisp, durable shifting
- Sealed bearing tension pulley
- Compatible with 10 speed Shimano drivetrains
- Shimano Reference Number: RD 5700A
How To Set Up A Mountain Bike Derailleur
