Best Cyclocross Rear Bike Derailleurs in 2026

Capable of handling up to a 30t maximum cassette size

Extra stiff for crisp, durable shifting

Sealed bearing tension pulley

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

Shimano fd-m310 Altus 8-Speed front derailleur, conventional swing, 42-48t, 66-69 degree

Model: RD-TY300 rear derailleur, compatible with 6 and 7-speed SIS INDEX variable speed transmission systems compatible with 11T /14T high speed gear

Stability: Durable aluminum alloy material and excellent shifting performance ensure safe and stable riding Smooth shifting,

Wide application: Rear derailleur is easy to use and maintain.Suitable for MTB,mountain bikes, road bikes, folding bicycles and so on.

Anodised CNC machined bicycle jockey wheel with fully sealed bearing for center bolt derailleurs

Specification:SHIMANO & SRAM

Fits for almost all mountain bike of 11T

【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.

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.

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.

*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.

【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.

Cage Lengths: SGS-long, Capacity: 45T, Derailleur Action: Top-Normal (Traditional)

Derailleur Color: black, Drivetrain Spacing: Shimano/SRAM 9, Largest Cog: 34teeth, Min/Max: 11/34T

Shifter/Rear Derailleur : SRAM 1:1, Speeds: 7/8sp, Speeds: 8sp, Speeds: 9sp, Weight: 310g

Bicycle Rear Derailleur Guard Rack Protector。It is 10.5cm in length and 6cm in width

The thickened and thickened steel rear shift gear protector is suitable for all kinds of vehicle models.

The installation is simple. durable.

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.

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.

WHY USING OVERSIZED PULLEY WHEEL CAGE-Upgrade your drivetrain for ultimate efficiency and superior performance.KCNC Wheel Bearings reduce friction, which gives you a lower rolling resistance.Upgrading your wheel bearings to oversized pulley will maximize the return you get from your energy.

THE EFFICIENCY OF OSPW-The Oversized Pully Wheel(OSPW) system reduces friction in the pulleys by 45 % and for your optimised performance.The overall power savings of the OSPW System reach 30%-60%, or more in some cases, over a stock setup.

NARROW WIDE PULLEY&DURABLE CHAIN RETENTION-The OSPW for Shimano features a narrow wide tooth profile to ensure durable chain retention.The system consists of Top 12t & Bottom 16t alloy pulley wheels fitted with low friction bearings and a lightweight cage made from 7075 Alloy.Coated bearings prolong the lifetime even further.The oversized pulley wheels have 3-5 times longer lifetime than the commonly used standard pulleys on the market.

Universal bicycle rear derailleur protection: it really protects the front derailleur from knocks in the event of a fall

Easy to install: pull out axle, thread protection on axle, tighten with nut, done

High quality: the bicycle safety bar is made of high-quality iron, rust-proof and durable

【Less Friction, Faster Ride】TRiPEAK SHIMANO/SRAM 10/11 speed pulleys with signature ceramic bearings offer distinguished smoothness to your paddling. Being 58% lighter and 120% harder, the pulleys grant creamy chain rotation with notably less friction and noise.

【Derailleur Compatibility】Fits SHIMANO Ultegra 8000, Dura Ace 9100, 105 R7000 road bike series, SRAM 10/11 speed road groupset series, with friction reduced to the minimum.

【Maximize Power Transfer】Provides stable chain retention and crisp shifting with the least drag. Unparalleled smoothness is guaranteed.

🚴XL1 OSPW For: SHIMANO R8000/R8050/R8070/R9170/R9150/R9100

🚴17 Teeth Guide Wheel: Save 60% of friction resistance.

🚴Lightweight: Carbon fiber rear derailleur Pulleys, weighing only 0.19lb.

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;

【Presenting the Best】TRiPEAK ceramic bearing offers distinguished smoothness to your paddling. Being 58% lighter and 120% harder, the pulley grants creamy chain rotation with notably less friction and noiseless.

【Oversized Pulley】12&14-Tooth oversized design with wide and narrow tooth shapes. Offering precision in chain engagement, ultra smooth performance and significantly reduced friction.

【Derailleur Compatibility】Fits SHIMANO Road Ultegra 8000/Dura Ace 9100/105 R7000 11 speed series, with the least drag ever.

HIGH QUALITY MATERIAL: CNC machined 6061 T651 aviation aluminium.

STYLISH LOOK: Black color, anodized finish. SHIFTING IMPROVEMENT.

EASY TO INSTALL.

WHY USING OVERSIZED PULLEY WHEEL CAGE-Upgrade your drivetrain for ultimate efficiency and superior performance. KCNC Wheel Bearings reduce friction, which gives you a lower rolling resistance.Upgrading your wheel bearings to oversized pulley will maximize the return you get from your energy.

WHY TITANIUM CAGE-Titanium is a strong and lightweight refractory metal.Alloys containing titanium are known for their high strength and low weight.Despite being as strong as steel, titanium is about 40% lighter in weight.

THE EFFICIENCY OF OSPW-The Oversized Pully Wheel(OSPW) system reduces friction in the pulleys by 45 % and for your optimized performance.The overall power savings of the OSPW System for 11s Campagnolo Super Record/Record/EPS/Chorus/Potenza reach 30%-60%, or more in some cases, over a stock setup.Almost have the same efficiency ratio with Ceramicspeed.

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;

🚗【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.

WHY USING OVERSIZED PULLEY WHEEL CAGE-Upgrade your drivetrain for ultimate efficiency and superior performance.KCNC Wheel Bearings reduce friction, which gives you a lower rolling resistance.Upgrading your wheel bearings to oversized pulley will maximize the return you get from your energy.

WHY TITANIUM CAGE-Titanium is a strong and lightweight refractory metal.Alloys containing titanium are known for their high strength and low weight.Despite being as strong as steel, titanium is about 40% lighter in weight.

THE EFFICIENCY OF OSPW-The Oversized Pully Wheel(OSPW) system reduces friction in the pulleys by 45 % and for your optimised performance.The overall power savings of the OSPW System for Sram red/force reach 30%-60%, or more in some cases, over a stock setup.Almost have the same efficiency ratio with Ceramicspeed.

SENSAH SRX Pro Cyclocross Road Bike Shifters Double 1×11 Speed Gravel Road Bike Lever Brake Bicycle Derailleur

STI+RD:767g

The Oversized Pully Wheel System reduces friction in the pulleys by 45 % and for your optimised performance.

The product does not include Shimano rear deraileur

compatible shimano R7000

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