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
Bestseller No. 1 
Hycline Shimano Bike Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bicycle-Black
- MODEL: RD-TZ31A Black Rear Derailleur,Suitable for 6/7speed.
- PERFORMANCE:Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable.
- PRECISE ADJUSTMENT: High-hardness aluminum alloy body adjustment, adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
- INSTALLATION:Fast and convenient installation and easy maintenance.(Note:The bike rear derailleur is direct mount,not hub bolt mount .Please check the mount type of the original part before ordering.)
- SCOPE OF APPLICATION:Suitable for mountain bikes, station wagons, folding bikes, etc.If you have any questions,please feel free to contact us.We will provide timely response and quality service.
SaleBestseller No. 2 
Shimano Bike Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount Rear Derailleur for Mountain Bike Tricycle Commuter Bike Folding Bike
- Model: RD-TZ31-A; Bike rear derailleur, compatible with 6/7 speed mountain bikes, commuter bike, tricycle, folding bike etc.
- Note: The bike rear derailleur is direct mount, not hub bolt mount. Please choose right mount way before you purchase.
- Stability: Made of high quality durable aluminum alloy material and come with excellent shifting performance ensure your safe and stable while riding.
- Application: Suitable for MTB, mountain bikes, road bikes, folding bicycles, commuter bikes, tricycles, eletric bikes etc.
- Important: We provide excellent customer service, please feel free to contact if you have any questions.
Bestseller No. 3 
MEGHNA Shimano Altus Rear Derailleur RD-M310 7/8 Speed Mountain Bike Rear Derailleur Direct Mount
- Shimano RD-M310 (RD-CT95) Altus Rear Derailleur 7/8 Speed / D-ATT Black
- Model: RD-M310 Compatible with: 7/8 speeds Max Rear Sprocket: 34T Total Capacity:43T
- Shimano Altus 7/8 Speed Black RD-M310 Mountain Bike Rear Derailleur-Direct Mount
- Derailleur Action: Top-Normal (Traditional) Cage Length: Long
- Advanced light-action design Teflon-coated bushings Direct-attach rear derailleurs
SaleBestseller No. 4 
Shimano Rd-tz 31 Rear Derailleur 7speed Hub Bolt Mount
- Model:RD-TZ31-A rear derailleur compatible with 6/7 speed mountain bikes.
- Note:The bike rear derailleur is direct mount,not hub bolt mount.
- Stability: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- Application: Suitable for MTB,mountain bikes, road bikes, folding bicycles,tricycles ect.
- Important: Please Purchase from the JESSIXI Shop, others is fake.
Bestseller No. 5 
Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount, Medium Cage, for Mountain Bike
- 【Model】 Shimano Tourney (SIS) RD-TZ31-GS 6/7 speed，medium-cage , direct mount.No retail packaging. Items as shown
- 【Specifications】 Total capacity(aka chain capacity) 34T, Largest sprocket 28T , Smallest sprocket 14T, Front chainwheel tooth difference 20T.
- 【Compatibility】 Compatible with 6 and 7-speed SIS Index Shifting drivetrains, for mountain bike.
- 【Incompatibility】 1) Not compatible with hub bolt mount (bracket mount) frame 2)If the total capacity of your bike exceeds 34T, this RD-TZ31 is not compatible with your bike, please konw before buying. Please see below for a detailed description of how to calculate total capicity.
- 【Tools Required】 5mm allen wrench
SaleBestseller No. 6 
Hycline Shimano Rear Derailleur RD-TY300 6/7/8 Speed Direct Mount for Mountain Bike-Black
- MODEL:RD-TY300 Rear Derailleur,Suitable for 6/7/8 speed.ASNXBXW
- PERFORMANCE:Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable.
- PRECISE ADJUSTMENT: High-hardness aluminum alloy body adjustment, adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
- INSTALLATION:Fast and convenient installation and easy maintenance.(Note:The rear derailleur is directly mount,not hub bolt mount.Please check the mount type of the original parts before ordering.)
- SCOPE OF APPLICATION:Suitable for mountain bikes, station wagons, folding bikes, etc.If you have any questions,please feel free to contact us.We will provide timely response and quality service.
SaleBestseller No. 7 
SRAM Force 22 WiFli Medium Rear Derailleur
- Extended B-Knuckle for improved clearance for 28t cassettes
- Exact Actuation shifting provides fast, accurate shifts
- Outside Carbon Cage designed for precise chain management and new reduced profile inner cage
- Silent shifting with optimized AeroGlide Pulleys with steel bearings.
- Weight: 178g (short cage)
SaleBestseller No. 8 
SHIMANO Rear DERAILLEUR, RD-R8000, ULTEGRA, GS 11-Speed, Shadow Design, Direct Attachment, W/OT-RS900(Black)
- Stable Shifting Performance
- Shimano Shadow Construction
- Low profile rear design
- Uses a 11-30T cassette
Bestseller No. 9 
MEGHNA Shimano Tourney RD-TZ500 6 Speed Long Cage Bike Rear Derailleur Direct Mount for Mountain Bike Road Bike
- Model:RD-TZ500-GS; 6-Speed Bike Rear Derailleur.
- SHIMANO TOURNEY TZ-Rear Derailleur-Medium Cage-6-speed.
- Total capacity: 34T; Compatible chain: HG-UG 6-speed.
- Compatible with 6 speed SIS Index Shifting drivetrains,the SHIMANO TOURNEY TY500 derailleur is offered in a wide range of fitments and cage options.
Bestseller No. 10 
ZUKKA Bike Rear Derailleur-RD-TZ31-A 6/7 Speed Hub Bolt Mount (Hanger Mount) for MTB Mountain,Road,Variable Speed,Folding,City Bicycles/Black
- MODEL:RD-TZ31-A bike rear derailleur, Compatible with 6 and 7-speed SIS Index Shifting drivetrains.
- IMPORTANT : The hub bolt mount （hanger mount) rear derailleur for mountain bike, not direct mount.
- EXCELLENT PERFORMANCE:Accurate gears provide light and stable shift performance,and making riding easy and comfortable.
- MATERIAL:Made of high-quality steel materials,durable and long service life.Easy to install and disassemble.
- APPLICATION: Suitable for MTB mountain bike ,road bikes ,variable speed bicycle,folding and city bikes.It is your indispensable bicycle accessories during your cycling journey.
Bestselling Mountain Bike Rear Derailleurs
Bestseller No. 1
Hycline Shimano Bike Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bicycle-Black
- MODEL: RD-TZ31A Black Rear Derailleur,Suitable for 6/7speed.
- PERFORMANCE:Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable.
- PRECISE ADJUSTMENT: High-hardness aluminum alloy body adjustment, adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
- INSTALLATION:Fast and convenient installation and easy maintenance.(Note:The bike rear derailleur is direct mount,not hub bolt mount .Please check the mount type of the original part before ordering.)
- SCOPE OF APPLICATION:Suitable for mountain bikes, station wagons, folding bikes, etc.If you have any questions,please feel free to contact us.We will provide timely response and quality service.
SaleBestseller No. 2
Shimano Bike Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount Rear Derailleur for Mountain Bike Tricycle Commuter Bike Folding Bike
- Model: RD-TZ31-A; Bike rear derailleur, compatible with 6/7 speed mountain bikes, commuter bike, tricycle, folding bike etc.
- Note: The bike rear derailleur is direct mount, not hub bolt mount. Please choose right mount way before you purchase.
- Stability: Made of high quality durable aluminum alloy material and come with excellent shifting performance ensure your safe and stable while riding.
- Application: Suitable for MTB, mountain bikes, road bikes, folding bicycles, commuter bikes, tricycles, eletric bikes etc.
- Important: We provide excellent customer service, please feel free to contact if you have any questions.
Bestseller No. 3
MEGHNA Shimano Altus Rear Derailleur RD-M310 7/8 Speed Mountain Bike Rear Derailleur Direct Mount
- Shimano RD-M310 (RD-CT95) Altus Rear Derailleur 7/8 Speed / D-ATT Black
- Model: RD-M310 Compatible with: 7/8 speeds Max Rear Sprocket: 34T Total Capacity:43T
- Shimano Altus 7/8 Speed Black RD-M310 Mountain Bike Rear Derailleur-Direct Mount
- Derailleur Action: Top-Normal (Traditional) Cage Length: Long
- Advanced light-action design Teflon-coated bushings Direct-attach rear derailleurs
SaleBestseller No. 4
Shimano Rd-tz 31 Rear Derailleur 7speed Hub Bolt Mount
- Model:RD-TZ31-A rear derailleur compatible with 6/7 speed mountain bikes.
- Note:The bike rear derailleur is direct mount,not hub bolt mount.
- Stability: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- Application: Suitable for MTB,mountain bikes, road bikes, folding bicycles,tricycles ect.
- Important: Please Purchase from the JESSIXI Shop, others is fake.
Bestseller No. 5
Inkesky RD-TZ31-GS 6/7 Speed Rear Derailleur with Direct Mount, Medium Cage, for Mountain Bike
- 【Model】 Shimano Tourney (SIS) RD-TZ31-GS 6/7 speed，medium-cage , direct mount.No retail packaging. Items as shown
- 【Specifications】 Total capacity(aka chain capacity) 34T, Largest sprocket 28T , Smallest sprocket 14T, Front chainwheel tooth difference 20T.
- 【Compatibility】 Compatible with 6 and 7-speed SIS Index Shifting drivetrains, for mountain bike.
- 【Incompatibility】 1) Not compatible with hub bolt mount (bracket mount) frame 2)If the total capacity of your bike exceeds 34T, this RD-TZ31 is not compatible with your bike, please konw before buying. Please see below for a detailed description of how to calculate total capicity.
- 【Tools Required】 5mm allen wrench
SaleBestseller No. 6
Hycline Shimano Rear Derailleur RD-TY300 6/7/8 Speed Direct Mount for Mountain Bike-Black
- MODEL:RD-TY300 Rear Derailleur,Suitable for 6/7/8 speed.ASNXBXW
- PERFORMANCE:Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable.
- PRECISE ADJUSTMENT: High-hardness aluminum alloy body adjustment, adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
- INSTALLATION:Fast and convenient installation and easy maintenance.(Note:The rear derailleur is directly mount,not hub bolt mount.Please check the mount type of the original parts before ordering.)
- SCOPE OF APPLICATION:Suitable for mountain bikes, station wagons, folding bikes, etc.If you have any questions,please feel free to contact us.We will provide timely response and quality service.
SaleBestseller No. 7
SRAM Force 22 WiFli Medium Rear Derailleur
- Extended B-Knuckle for improved clearance for 28t cassettes
- Exact Actuation shifting provides fast, accurate shifts
- Outside Carbon Cage designed for precise chain management and new reduced profile inner cage
- Silent shifting with optimized AeroGlide Pulleys with steel bearings.
- Weight: 178g (short cage)
SaleBestseller No. 8
SHIMANO Rear DERAILLEUR, RD-R8000, ULTEGRA, GS 11-Speed, Shadow Design, Direct Attachment, W/OT-RS900(Black)
- Stable Shifting Performance
- Shimano Shadow Construction
- Low profile rear design
- Uses a 11-30T cassette
Bestseller No. 9
MEGHNA Shimano Tourney RD-TZ500 6 Speed Long Cage Bike Rear Derailleur Direct Mount for Mountain Bike Road Bike
- Model:RD-TZ500-GS; 6-Speed Bike Rear Derailleur.
- SHIMANO TOURNEY TZ-Rear Derailleur-Medium Cage-6-speed.
- Total capacity: 34T; Compatible chain: HG-UG 6-speed.
- Compatible with 6 speed SIS Index Shifting drivetrains,the SHIMANO TOURNEY TY500 derailleur is offered in a wide range of fitments and cage options.
Bestseller No. 10
ZUKKA Bike Rear Derailleur-RD-TZ31-A 6/7 Speed Hub Bolt Mount (Hanger Mount) for MTB Mountain,Road,Variable Speed,Folding,City Bicycles/Black
- MODEL:RD-TZ31-A bike rear derailleur, Compatible with 6 and 7-speed SIS Index Shifting drivetrains.
- IMPORTANT : The hub bolt mount （hanger mount) rear derailleur for mountain bike, not direct mount.
- EXCELLENT PERFORMANCE:Accurate gears provide light and stable shift performance,and making riding easy and comfortable.
- MATERIAL:Made of high-quality steel materials,durable and long service life.Easy to install and disassemble.
- APPLICATION: Suitable for MTB mountain bike ,road bikes ,variable speed bicycle,folding and city bikes.It is your indispensable bicycle accessories during your cycling journey.
Top Shimano Mountain Bike Derailleurs
Bestseller No. 1
Hycline Shimano Bike Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bicycle-Black
- MODEL: RD-TZ31A Black Rear Derailleur,Suitable for 6/7speed.
- PERFORMANCE:Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable.
- PRECISE ADJUSTMENT: High-hardness aluminum alloy body adjustment, adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
- INSTALLATION:Fast and convenient installation and easy maintenance.(Note:The bike rear derailleur is direct mount,not hub bolt mount .Please check the mount type of the original part before ordering.)
- SCOPE OF APPLICATION:Suitable for mountain bikes, station wagons, folding bikes, etc.If you have any questions,please feel free to contact us.We will provide timely response and quality service.
SaleBestseller No. 2
Shimano Bike Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount Rear Derailleur for Mountain Bike Tricycle Commuter Bike Folding Bike
- Model: RD-TZ31-A; Bike rear derailleur, compatible with 6/7 speed mountain bikes, commuter bike, tricycle, folding bike etc.
- Note: The bike rear derailleur is direct mount, not hub bolt mount. Please choose right mount way before you purchase.
- Stability: Made of high quality durable aluminum alloy material and come with excellent shifting performance ensure your safe and stable while riding.
- Application: Suitable for MTB, mountain bikes, road bikes, folding bicycles, commuter bikes, tricycles, eletric bikes etc.
- Important: We provide excellent customer service, please feel free to contact if you have any questions.
Bestseller No. 3
MEGHNA Shimano Altus Rear Derailleur RD-M310 7/8 Speed Mountain Bike Rear Derailleur Direct Mount
- Shimano RD-M310 (RD-CT95) Altus Rear Derailleur 7/8 Speed / D-ATT Black
- Model: RD-M310 Compatible with: 7/8 speeds Max Rear Sprocket: 34T Total Capacity:43T
- Shimano Altus 7/8 Speed Black RD-M310 Mountain Bike Rear Derailleur-Direct Mount
- Derailleur Action: Top-Normal (Traditional) Cage Length: Long
- Advanced light-action design Teflon-coated bushings Direct-attach rear derailleurs
SaleBestseller No. 4
Shimano Rd-tz 31 Rear Derailleur 7speed Hub Bolt Mount
- Model:RD-TZ31-A rear derailleur compatible with 6/7 speed mountain bikes.
- Note:The bike rear derailleur is direct mount,not hub bolt mount.
- Stability: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- Application: Suitable for MTB,mountain bikes, road bikes, folding bicycles,tricycles ect.
- Important: Please Purchase from the JESSIXI Shop, others is fake.
SaleBestseller No. 5
Hycline Shimano Rear Derailleur RD-TY300 6/7/8 Speed Direct Mount for Mountain Bike-Black
- MODEL:RD-TY300 Rear Derailleur,Suitable for 6/7/8 speed.ASNXBXW
- PERFORMANCE:Forged with high hardness aluminum alloy.The hollow weight-reduction design is adopted,and the speed change is more stable.
- PRECISE ADJUSTMENT: High-hardness aluminum alloy body adjustment, adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
- INSTALLATION:Fast and convenient installation and easy maintenance.(Note:The rear derailleur is directly mount,not hub bolt mount.Please check the mount type of the original parts before ordering.)
- SCOPE OF APPLICATION:Suitable for mountain bikes, station wagons, folding bikes, etc.If you have any questions,please feel free to contact us.We will provide timely response and quality service.
How To Set Up A Mountain Bike Derailleur
