Best Rear Bike Derailleurs of 2025

The Shimano RDM310DL Altus GS Rear Derailleur is a high-quality component that is perfect for city sport and youth bikes. With a chain wrap capacity of 43 teeth and a derailleur action of top-normal, this derailleur is designed to provide smooth and reliable shifting. It has a black color and is compatible with Shimano/SRAM 8 drivetrain spacing. The largest cog is 34 teeth and it weighs 326g.

The SHIMANO Rear Derailleur is a bike shifter designed to be compatible with all Shimano 6 and 7 speed shifters. Its advanced light action design makes shifting gears easier and smoother. The SGS cage can handle a wide range of gearing, making it suitable for various terrains. The SIS Rear index shifting ensures accurate and precise gear changes. The 13 tooth pulleys offer long service life and less noise, providing a more comfortable and enjoyable riding experience.

The SHIMANO Tourney TY300 6/7-Speed Rear Derailleur with Dropout Claw Hanger is a great choice for your bike. With the Smart Cage feature, the derailleur cage is shorter, making it compatible with MegaRange. The chain wrap capacity of 43 and long cage length provide easy and smooth shifting. Additionally, the SHIMANO Tourney TY300 Rear Derailleur is a replacement for the rd8162. The Smart Cage feature is especially useful for riders who frequently ride on steep hills or mountains. The shorter derailleur cage allows for easier shifting when tackling steep inclines. The long cage length and chain wrap capacity of 43 provide a smooth and reliable shifting experience, making it an excellent choice for riders of all levels.

The Shimano Rear Derailleur, RD-TX800, is a durable and efficient 3x8-speed rear derailleur designed for stress-free riding. With its light action shifting performance and double Servo-panta mechanism, this derailleur offers quick assembly and an Allen key type inner cable fixing bolt. It can accommodate a total capacity of 43T, making it a great choice for front bike derailleurs.

The microSHIFT M21 Derailleur is built to last with its strong composite and steel design, ensuring durability during your rides. It is compatible with Shimano's 6- and 7-speed systems, giving you flexibility whether you're on a mountain or road bike. The long cage design supports double or triple setups with a 32T configuration, allowing for smooth gear transitions. This versatility can enhance your biking experience by making it easier to tackle various terrains and inclines, ensuring you always have the right gear at your fingertips.

The THALOUS Tourney RD-TZ31-A Rear Derailleur is a high-quality and durable bicycle transmission suitable for 6-speed and 7-speed SIS index variable speed drives. Made of sturdy steel, this rear derailleur is resistant to deformation and damage, ensuring long-lasting performance. The smooth and silent guide wheel allows for effortless shifting, providing a comfortable riding experience. With its hook mounted design, it is important to check if your bicycle is compatible before purchasing. This versatile rear derailleur is suitable for a wide range of bikes, including mountain bikes, road bikes, and folding bikes, making it an ideal choice for various cycling needs.

The Inkesky RD-TZ31-GS Rear Derailleur is a medium-cage, direct mount derailleur designed for 6 and 7-speed SIS Index Shifting drivetrains on mountain bikes. With a total capacity of 34T, largest sprocket of 28T, and smallest sprocket of 14T, this derailleur is a great option for riders looking to upgrade their shifting performance. However, it is important to note that it is not compatible with hub bolt mount frames and bikes with a total capacity exceeding 34T.

The Shimano Deore Derailleur features a low-profile design that helps protect it from damage caused by rocks and obstacles on the trail. This durable construction ensures that you can ride confidently without worrying about the derailleur getting knocked out of alignment. Additionally, the built-in chain stabilizer effectively prevents the chain from bouncing or hitting, leading to a smoother ride. With high-quality workmanship, this rear derailleur is designed to enhance your cycling experience and improve overall performance, giving you peace of mind during your rides.

The Shimano Acera Rear Derailleur is a high-performance component designed for 7 and 8-speed drivetrains. Its double servo mechanism allows for precise and smooth shifting, ensuring that the rear derailleur moves along the optimal path. This feature enhances the overall performance of the derailleur, making it a reliable choice for cyclists of all levels. The Shimano Acera Rear Derailleur also boasts versatile compatibility, allowing it to work seamlessly with a wide range of bikes. With its SGS long cage, it has a chain wrap capacity of up to 45 teeth, providing ample room for a variety of gear configurations. Whether you're a casual rider or a seasoned cyclist, the Shimano Acera Rear Derailleur offers the convenience and reliability you need for a smooth and efficient ride.

The THALOUS Bicycle Rear Derailleur is a high-quality and durable option for your bike. Made of sturdy steel, it is resistant to deformation and damage, ensuring long-lasting performance. This rear derailleur is designed for 6-speed and 7-speed SIS index variable speed drives, making it suitable for a wide range of bikes including mountain bikes, road bikes, and folding bikes. Its direct installation method allows for easy setup, and its compatibility with various bike types makes it a versatile choice. With THALOUS' professional customer service, any questions or concerns can be addressed promptly. Upgrade your bike's performance with the THALOUS Rear Derailleur.