Category: Mountain Bike Gears and Components Mountain biking is a thrilling outdoor activity that requires a lot of physical exertion. As such, it's important to have the right gear and components to make your ride as smooth and enjoyable as possible. In this review, we will take a closer look at some of the best mountain bike rear derailleurs on the market today. 1. Shimano RD-M986 XTR Shadow Plus 10 Speed Rear Derailleur: The Shimano RD-M986 XTR Shadow Plus is one of the most popular and highly regarded rear derailleurs in the mountain biking community. It features a high-quality design that is both durable and reliable, making it an excellent choice for serious riders who demand the best performance possible. One of the key features of this rear derailleur is its Shadow Plus technology, which allows for smoother shifting and improved chain stability. This makes it easier to maintain your speed and momentum on challenging terrain, allowing you to focus more on enjoying your ride rather than worrying about your gear. Another great feature of the Shimano RD-M986 XTR Shadow Plus is its compatibility with a wide range of bikes and components. Whether you're riding a hardtail or full-suspension bike, this rear derailleur can be easily integrated into your existing setup, making it an excellent choice for riders who want to upgrade their gear without having to completely overhaul their bike. Overall, the Shimano RD-M986 XTR Shadow Plus is a top-of-the-line rear derailleur that delivers exceptional performance and reliability. If you're looking for a high-quality component that will help take your mountain biking to the next level, this is definitely worth considering. 2. Shimano Deore XT RD-M786 SGS Shadow Plus Rear Derailleur: The Shimano Deore XT RD-M786 SGS Shadow Plus is another excellent rear derailleur from Shimano that is designed specifically for mountain biking. It features a similar design to the Shimano RD-M986 XTR Shadow Plus, with a focus on durability and reliability. One of the key differences between this rear derailleur and its more expensive cousin is its price point. While it may not have all the bells and whistles of the Shimano RD-M986 XTR Shadow Plus, it still offers excellent performance and value for money. Another great feature of the Shimano Deore XT RD-M786 SGS Shadow Plus is its compatibility with a wide range of bikes and components. Whether you're riding a hardtail or full-suspension bike, this rear derailleur can be easily integrated into your existing setup, making it an excellent choice for riders who want to upgrade their gear without having to completely overhaul their bike. Overall, the Shimano Deore XT RD-M786 SGS Shadow Plus is a high-quality rear derailleur that offers great performance and value for money. If you're looking for an affordable option that will help take your mountain biking to the next level, this is definitely worth considering. 3. SHIMANO XT RD-M786 GS Shadow Plus Rear Derailleur Size: The SHIMANO XT RD-M786 GS Shadow Plus is a high-end rear derailleur that is designed specifically for serious mountain bikers who demand the best performance possible. It features a sleek and durable design, with a focus on reliability and durability. One of the key features of this rear derailleur is its Shadow Plus technology, which allows for smoother shifting and improved chain stability. This makes it easier to maintain your speed and momentum on challenging terrain, allowing you to focus more on enjoying your ride rather than worrying about your gear. Another great feature of the SHIMANO XT RD-M786 GS Shadow Plus is its compatibility with a wide range of bikes and components. Whether you're riding a hardtail or full-suspension bike, this rear derailleur can be easily integrated into your existing setup, making it an excellent choice for riders who want to upgrade their gear without having to completely overhaul their bike. Overall, the SHIMANO XT RD-M786 GS Shadow Plus is a top-of-the-line rear derailleur that delivers exceptional performance and reliability. If you're looking for a high-quality component that will help take your mountain biking to the next level, this is definitely worth considering. 4. SRAM X5 10 Speed Rear Derailleur: The SRAM X5 10 Speed Rear Derailleur is another excellent rear derailleur from SRAM that is designed specifically for mountain biking. It features a sleek and durable design, with a focus on reliability and durability. One of the key features of this rear derailleur is its compatibility with a wide range of bikes and components. Whether you're riding a hardtail or full-suspension bike, this rear derailleur can be easily integrated into your existing setup, making it an excellent choice for riders who want to upgrade their gear without having to completely overhaul their bike. Another great feature of the SRAM X5 10 Speed Rear Derailleur is its high-quality design and construction. This rear derailleur features a strong aluminum frame, with durable gears that are designed to last for years to come. Overall, the SRAM X5 10 Speed Rear Derailleur is an excellent choice for riders who want a reliable and durable component that will help take their mountain biking to the next level. Whether you're a serious competitor or just looking to upgrade your gear, this rear derailleur is definitely worth considering. 5. SHIMANO RD-M640 Zee Shadow Plus 10 Speed Rear Derailleur: The SHIMANO RD-M640 Zee Shadow Plus is a high-quality rear derailleur that is designed specifically for mountain biking. It features a sleek and durable design, with a focus on reliability and durability. One of the key features of this rear derailleur is its compatibility with a wide range of bikes and components. Whether you're riding a hardtail or full-suspension bike, this rear derailleur can be easily integrated into your existing setup, making it an excellent choice for riders who want to upgrade their gear without having to completely overhaul their bike. Another great feature of the SHIMANO RD-M640 Zee Shadow Plus is its high-quality design and construction. This rear derailleur features a strong aluminum frame, with durable gears that are designed to last for years to come. Overall, the SHIMANO RD-M640 Zee Shadow Plus is an excellent choice for riders who want a reliable and durable component that will help take their mountain biking to the next level. Whether you're a serious competitor or just looking to upgrade your gear, this rear derailleur is definitely worth considering. In conclusion, when it comes to choosing the right rear derailleur for your mountain bike, there are many great options available on the market today. From high-end components like the Shimano RD-M986 XTR Shadow Plus and SRAM XX1 Eagle 12-Speed Rear Derailleur to more affordable options like the Shimano Deore XT RD-M786 SGS Shadow Plus and SHIMANO RD-M640 Zee Shadow Plus, there is something for everyone. Ultimately, the best rear derailleur for your mountain bike will depend on a variety of factors, including your budget, riding style, and specific needs.