Best Racing Rear Bike Derailleurs in 2026

The Shimano Alivio RD-M3100 Rear Derailleur features Shadow RD technology to keep the derailleur safe from trail obstacles.

Super low profile Shadow RD technology

Largest Cog: 36 Drivetrain Speeds: 9 Cage Length: Long

Sram X3 is a great beginners or light adventurers rear derailleur

The X3 rear derailleur sets the standard for opening price point shifting performance

Outer cage made of steel

【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.

【PACKAGE】2 x Bicycle Derailleur Hanger Replacement.

【FUNCTION】Play to protect the transmission after dialing role.

【APPLICATION】Universal type fit for most of bike in case of emergency.

Application:Provide effective protection for rear derailleur, prevent the derailleur was struck distortion or displacement in riding.

Size:115 X 54 X40 mm/4.5'' X 2.1'' X 1.57''

Easy to installed:Just be fixed in the corresponding hole position;

Universal Derailleur Guard for Quick Release or Bolt on Rear Axles.

Easy to installed:Just be fixed in the corresponding hole position.

Made of strong steel,very durable,suitable for most mountain bikes, road bikes, folding bicycles, racing bikes.

JRC Components Ceramic Pulley Wheels are compatible with all SRAM Eagle Systems. Narrow-Wide Ceramic 12 + 14tooth Jockey Wheels are crafted from billet aluminium, CNC machined and finally anodised before having hybrid ceramic bearings installed.

Ultra Lightweight at only 27g per set.

Hybrid Ceramic bearings to lessen friction and packed with grease for flawless use all year round!

The Rear Derailleur Guard is certainly worth purchasing if your derailleur is unprotected. It Provides effective protection for rear derailleur, prevent the derailleur was struck distorti on or displacement in riding

The Rear Derailleur Guard is very easy to install and will actually protect the Derailleur in the event of a drop.It is Great for the kids bikes like mountain bike or MTB .Made of strong steel,very durable,suitable for most mountain bikes, road bikes, folding bicycles, racing bikes

The Rear Derailleur Guard is heavy-heavy and really protects the rear shifting mechanism.The guard appears to be made of a strong steel that will definitely reduce any potential damage in the event of accidents.this item is meant to fit onto the wheel axle, and not on the Derailleur nut.

Stainless steel racing wheel rear derailleur pulley, super durable, super smooth rotation.

Specification: SHIMANO & SRAM.

Anodized CNC machined bicycle guide wheel with fully sealed bearing for center bolt derailleur.

Material: Aluminum alloy;

Wide Range of Applications: Suitable for most types of mountain bike and road bike;

Effective Protection: After fixed on the rack, it can protect the transmission after dialing;

MATERIAL: Aluminum alloy, sturdy and solid, smooth surface;

EFFECTIVE PROTECTION: Can Well protect your bike from being damaged in case of falling down;

EASY TO INSTALL: With one screws, the upper end of the tail hook is connected with the frame, and the lower end is connected with the rear dial of the transmission;

🚴【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.

Used for quick release or bolt fixing of the rear axle.

Easy to install: just fix it in the corresponding hole position.

Made of strong steel, very durable, suitable for most mountain bikes, road bikes, folding bikes, and racing bikes.

🚗【PACKAGE】2 Pieces x Bicycle Derailleur Hanger.

🚗【FUNCTION】Play to protect the transmission after dialing role.

🚗【APPLICATION】Universal type fit for most of bike in case of emergency.

Compatible with all Campagnolo Super Record 12s / Record 12s / Chorus 12s - Double Speed Cranks

Specially designed inner guide plate for maximum uplift speed

Optimised handlebar arm with additional pivot point for effective and precise movement without the driver feeling contact with the lifting limiter bolt.

It is often used when the large teeth of the rear flywheel are changed to 36T/40T/42T/44T/46T/50T/52T/56T.

Made of aluminum material, durable and corrosion‑resistant, has long service life.

After the extension of the tail hook is added, the flywheel gear and the rear derailleur will not collide.

[Universal Derailleur Hanger]: Our bike derailleur hanger fits to most types of bikes, mountain bikes, road bikes; It can be replaced, reduce the maintenance cost of frame

[Convenient to Install & Remove]: Rear derailleur hanger with screw, foe your easy installation and remove, you can install and remove it easily; Easily installed in less than 5 minutes by any home mechanic

[Effective Protect Your Bike]: The bicycle derailleur protects your bicycle from damage when dropped, protecting fully protection to your bike

【MODEL】Bicycle rear derailleur, suitable for 9 speed SIS index variable speed drives. Please pay attention to the speed when buying.

【Direct installation】Before purchasing, please confirm whether the rear derailleur of your bicycle is directly installed or hook mounted. Our model is a direct installation method.

【High-quality material】This bicycle rear derailleur is made of high-quality steel, sturdy and durable, not easily deformed and not easily damaged.

After being installed on the frame for fixing, it protects the transmission after dialing.

Suitable for most types of bicycles and can be replaced, reducing the maintenance cost of the frame.

Size: 60.5x39.9mm / 2.38 x1.57inch (L x W). Thread diameter: M9. Hole diameter: 10mm / 0.39inch.

【MODEL】Bicycle rear derailleur RD-TY300, suitable for 6-speed and 7-speed SIS index variable speed drives.

Smooth shifting, easy and fast to install. Bracket fit (under wheel nut) Long cage tourney derailleur, compatible with 11T /14T high speed gear

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.

Made of aluminum material, durable and corrosion‑resistant, has long service life.

After the extension of the tail hook is added, the flywheel gear and the rear derailleur will not collide.

It is often used when the large teeth of the rear flywheel are changed to 36T/40T/42T/44T/46T/50T/52T/56T.