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 
Shimano Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bike (Black)
- 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 feel free to contact if you have any questions.
SaleBestseller No. 3 
SHIMANO Tourney 7/8-Speed Mountain Bicycle Rear Derailleur - RD-TX800-L (Black)
- Rear Derailleur (3x8-speed)
- 8-speed drive train
- Durable light action shifting peformance for stress free riding. Double Servo-panta Mechanism
- Quick assembly. Allen key type inner cable fixing bolt
- Total capacity 43T
SaleBestseller No. 4 
SHIMANO Deore SGS RD-M592 Rear Derailleur (9-Speed, Long Cage, Black)
- Precise chain movement changes gears smoothly
- Direct Mount
- Light shift effort
Bestseller No. 5 
MOHEGIA Bike Rear Derailleur RD-TY21B 6/7 Speed Direct Mount for Mountain Bicycle-Black
- Model：RD-TY21B rear derailleur compatible with 6/7 speed mountain bikes.
- Note:The rear derailleur is direct mount,not hub bolt mount .Please check the mount type of the original part before ordering.
- Stability: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- Wide application: Rear derailleur is easy to use and maintain.Suitable for MTB,mountain bikes, road bikes, folding bicycles and so on.
- Important: Please feel free to contact if you have any questions, we will provide quality service.
SaleBestseller No. 6 
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. 7 
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
Bestseller No. 8 
MEGHNA Shimano Tourney RD-TY300 6/7-Speed Rear Derailleur Road MTB Bike Mountain Bike Direct Mount
- Smooth shifting, easy and fast to install. Bracket fit (under wheel nut) Long cage tourney derailleur, compatible with 11T /14T high speed gear
- Rear derailleur, compatible with 6 and 7-speed SIS INDEX variable speed transmission systems
- B tension adjustment screw, so that the distance between the upper guide wheel and the tooth tip of the largest flywheel can not be less than 6mm
- Max Sprocket 34T. Min Sprocket 11T
- Long cage tourney derailleur, compatible with 11T /14T high speed gear
Bestseller No. 9 
Shimano Tourney A073 7-Speed Triple Front Derailleur
- Tourney FD-TX800, FD-A070/A073 Front Derailleur
SaleBestseller No. 10 
SHIMANO FD-M310 Aultus Front Derailleur (28.6-34.9-mm 3x7/8 Speed Low-Clamp)
- Mountain double or triple
- Dual Pull Design: Compatible with top or bottom routing
- Shimano Reference Number: FD-M310
Bestselling Mountain Bike Rear Derailleurs
Bestseller No. 1
Shimano Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bike (Black)
- 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 feel free to contact if you have any questions.
SaleBestseller No. 3
SHIMANO Tourney 7/8-Speed Mountain Bicycle Rear Derailleur - RD-TX800-L (Black)
- Rear Derailleur (3x8-speed)
- 8-speed drive train
- Durable light action shifting peformance for stress free riding. Double Servo-panta Mechanism
- Quick assembly. Allen key type inner cable fixing bolt
- Total capacity 43T
SaleBestseller No. 4
SHIMANO Deore SGS RD-M592 Rear Derailleur (9-Speed, Long Cage, Black)
- Precise chain movement changes gears smoothly
- Direct Mount
- Light shift effort
Bestseller No. 5
MOHEGIA Bike Rear Derailleur RD-TY21B 6/7 Speed Direct Mount for Mountain Bicycle-Black
- Model：RD-TY21B rear derailleur compatible with 6/7 speed mountain bikes.
- Note:The rear derailleur is direct mount,not hub bolt mount .Please check the mount type of the original part before ordering.
- Stability: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding.
- Wide application: Rear derailleur is easy to use and maintain.Suitable for MTB,mountain bikes, road bikes, folding bicycles and so on.
- Important: Please feel free to contact if you have any questions, we will provide quality service.
SaleBestseller No. 6
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. 7
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
Bestseller No. 8
MEGHNA Shimano Tourney RD-TY300 6/7-Speed Rear Derailleur Road MTB Bike Mountain Bike Direct Mount
- Smooth shifting, easy and fast to install. Bracket fit (under wheel nut) Long cage tourney derailleur, compatible with 11T /14T high speed gear
- Rear derailleur, compatible with 6 and 7-speed SIS INDEX variable speed transmission systems
- B tension adjustment screw, so that the distance between the upper guide wheel and the tooth tip of the largest flywheel can not be less than 6mm
- Max Sprocket 34T. Min Sprocket 11T
- Long cage tourney derailleur, compatible with 11T /14T high speed gear
Top Shimano Mountain Bike Derailleurs
Bestseller No. 1
Shimano Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bike (Black)
- 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 feel free to contact if you have any questions.
SaleBestseller No. 3
SHIMANO Tourney 7/8-Speed Mountain Bicycle Rear Derailleur - RD-TX800-L (Black)
- Rear Derailleur (3x8-speed)
- 8-speed drive train
- Durable light action shifting peformance for stress free riding. Double Servo-panta Mechanism
- Quick assembly. Allen key type inner cable fixing bolt
- Total capacity 43T
SaleBestseller No. 4
SHIMANO Deore SGS RD-M592 Rear Derailleur (9-Speed, Long Cage, Black)
- Precise chain movement changes gears smoothly
- Direct Mount
- Light shift effort
SaleBestseller No. 5
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
How To Set Up A Mountain Bike Derailleur
