If you’re looking for the best mountain bike derailleur to buy online, you’ve come to the right place. In this article, we’ll take a look at some of the best affordable mountain bike derailleur you can buy, based on extensive research and physical reviews.

We’ve spent a lot of time carefully selecting and reviewing the mountain bike derailleur, so if you want to know all the details, make sure to read the article carefully from start to finish.

Best mountain bike derailleur

Best mountain bike derailleur Reviews

Rank No. 1
Gloon Bike Rear Derailleur RD-TY300 7/8 Speed Direct Mount/Hanger Mount for Mountain Bike 4.72inch,...
  • RD-TY300 rear derailleur, suit for 7/8 speed drive system, Note: TY300 is only suitable for 7/8 speed mountain bike, and cannot be installed on 9 speed mountain bike, which will cause damage.
  • [installation tutorial]: apply solid grease to the lock point of the rear hook claw first, so as to make the installation more smooth and avoid damage to the lock point. confirm that there is mutual stop between the rear locking screw and the rear claw, and then lock the rear transmission with a 5mm hexagon wrench.
  • Use a 2.5mm Allen wrench to adjust the H screw so that the tooth tip of the upper guide wheel is aligned with the outside of the minimum flywheel tooth tip.
  • Move the rear transmission to the maximum flywheel, adjust the L screw with a 2.5mm Allen wrench, so that the tooth tip of the upper guide wheel is aligned with the outside of the tooth tip of the largest flywheel.use a 2.5mm Allen wrench to adjust the tension screw B, so that the distance between the upper guide wheel and the tooth tip of the largest flywheel can not be less than 6mm.
  • Bike rear derailleur, it is your indispensable bicycle accessories during your cycling journey.Compatible with 7 and 8 speed SIS Index Shifting drivetrains. Made of high-quality steel materials,durable and long service life.Accurate gears provide light and stable shift performance,and easy to install and disassemble. Suitable for MTB ,mountain bikes, road bikes, Folding bikes,City Bicycles and variable speed bicycles.
Rank No. 2
MEGHNA Bike Rear Derailleur 7/8 Speed RD-TX800 Direct Mount for Mountain Bike
  • Model:RD-TX800;Rear Derailleur-7/8-speed.
  • Features:8-Speed drive train; Durable light action shifting performance for stress free riding.
  • Quick Assembly:Double Servo-panta mechanism;Allen key type inner cable fixing bolt.
  • Pulley&Capacity:13T/13T pulley;Total capacity 43T;Low sprocket_Max.- 34T;Low sprocket_Min.- 28T.
  • Compatible Chain: HG 8/7-speed. Variable speed starter, compatible with 8-speed SIS index shift.
SaleRank No. 3
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
SaleRank 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 feel free to contact if you have any questions.
Rank No. 5
Rear Derailleur, Huazu Bike Parts Gear Shifter for Shimano RD-TZ31-A with Direct Mount/Hanger Mount...
  • 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.
Rank No. 6
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.
SaleRank No. 7
Revere Shimano Tourney 7/8-Speed Mountain Bicycle Rear Derailleur - RD-TX800-L (Black)
  • Authentic Shimano RD-TX800 tourney rear derailleur, compatible with 7/8 speed drive system, suitable for MTB mountain bikes, bicycles etc.
  • Long cage design, features an oversized jockey wheel. Double servo design keeps pulley close to sprockets for better shifting.
  • Hard aluminum alloy. The hollow weight-reduction design makes the speed changing more stable.
  • Adjustment is more precise. It can be adjusted slightly in multiple places to ensure accurate speed change performance.
  • Easy to install and remove, convenient to use. This bike rear derailleur is direct mount, not hub bolt mount. Please check the mount type of the original part before ordering.
SaleRank No. 8
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
Rank No. 9
Shimano Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bike (Black)
  • 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.
Rank No. 10
THALOUS Bicycle Rear Derailleur Tourney RD-TY21B 6/7 Speed for MTB Bike Direct Mount/Hanger Mount
  • 【MODEL】Bicycle rear derailleur RD-TY21B, suitable for 6-speed and 7-speed SIS index variable speed drives. Please pay attention to the speed when buying.
  • 【Hook mounted】Before purchasing, please confirm whether the rear derailleur of your bicycle is directly installed or hook mounted. This model is a Hook mounted method.
  • 【High-quality material】This bicycle rear derailleur is made of high-quality steel, sturdy and durable, not easily deformed and not easily damaged.
  • 【Wide application】This bicycle transmission is suitable for variable speed bikes, mountain bikes, road bikes, bicycle racing, 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.
Rank No. 11
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.
Rank No. 12
Shimano Bike Rear Derailleur - RD-TZ31 6/7 Speed Rear Derailleur - Ultra-Lightweight Aluminum Alloy...
  • 🚴【Shimano Bike Rear Derailleur】You will get model RD-TZ31-A bicycle rear derailleur, the road bike rear derailleur compatible with 6/7 speed 18/21 speed. The precise gearing of the bicycle rear derailleur provides light and stable shifting performance and improves drive efficiency, making your ride easy and comfortable. (Please note the speed when purchasing)
  • 🚴【Precise Adjustment & Stable】MTB rear derailleur is designed with high hardness aluminum alloy body adjustment, which makes the shifting more precise and has superb shifting stability. A folding bike rear derailleur for mountain bikes can be directly installed and can be fine-tuned in multiple positions to maintain at your most comfortable speed.
  • 🚴【High Quality]】The RD-TZ31 6/7 speed rear derailleur is made of skeletonized weight-saving one-piece aluminum alloy material, high-strength forging, strong and durable, not easily deformed, not easily damaged, silent and smooth, and does not wear the chain. The mountain bicycle rear derailleur is an indispensable bicycle accessory for cycling enthusiasts.
  • 🚴【Quick Installation】RD-TZ31A 6/7 speed bike rear derailleur is ergonomically designed for direct mounting, easy to use and maintain, not for wheel bolt mounting. (Note: Two different mounting methods, direct mount or suspension mount. Please check the original mounting type before ordering.)
  • 🚴【Application】This bicycle rear derailleur is suitable for shifting bicycles, mountain bikes, road bikes, bike racing, city biking, folding bike, tricycle, etc. It is a good helper for your riding. The bike's rear derailleur is also a perfect gift for long-distance riding enthusiasts
SaleRank No. 13
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

We understand that finding the right mountain bike derailleur can be difficult and time-consuming. This is why we created this article, to help you find the best mountain bike derailleur that suits your requirements. We hope that we were able to succeed in our mission to do so. If you are looking for a cheap mountain bike derailleur, keep in mind that you will get what you pay for. That being said, don’t forget to share the article with your friends and keep visiting our site for more informative and reviews articles.

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