Category: Mountain Bike Gears and Drivetrain Introduction: Mountain biking is a sport that requires a lot of physical exertion, and the gear you use can make all the difference in your performance. One of the most important components of any mountain bike is the drivetrain, which includes the rear derailleur. In this review, we will take a closer look at some of the best mountain bike rear derailleurs on the market today. Shimano Deore 9-Speed Mountain Bicycle Rear Derailleur - RD-M591: The Shimano Deore 9-Speed Mountain Bicycle Rear Derailleur - RD-M591 is a reliable and durable option for those looking for a high-quality rear derailleur. It features a long cage design, which allows it to accommodate larger chainrings, making it suitable for use with bikes that have wider handlebars or longer wheelbases. The RD-M591 also has a wide range of gears, allowing riders to tackle any terrain with ease. One downside of the RD-M591 is its weight, which can be a bit heavy for some riders. Additionally, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the Shimano Deore 9-Speed Mountain Bicycle Rear Derailleur - RD-M591 is a solid choice for anyone looking for a reliable and durable rear derailleur that will last for years to come. SHIMANO Deore RD-M592 Rear Derailleur: The SHIMANO Deore RD-M592 Rear Derailleur is another high-quality option from Shimano. It features a long cage design, similar to the RD-M591, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. The RD-M592 also has a number of other features that make it stand out from its competitors, including a lightweight design and a smooth shifting action. One downside of the SHIMANO Deore RD-M592 Rear Derailleur is its price, which can be quite high for some riders. Additionally, like the RD-M591, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the SHIMANO Deore RD-M592 Rear Derailleur is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. Shimano Deore XT Shadow Mountain Bicycle Rear Derailleur - RD-M772: The Shimano Deore XT Shadow Mountain Bicycle Rear Derailleur - RD-M772 is a high-end option from Shimano that is designed for use with the most demanding mountain bikes. It features a long cage design, similar to the RD-M591 and RD-M592, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. One downside of the Shimano Deore XT Shadow Mountain Bicycle Rear Derailleur - RD-M772 is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the Shimano Deore XT Shadow Mountain Bicycle Rear Derailleur - RD-M772 is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. SRAM X.4 Rear Derailleur (Black, Long Cage): The SRAM X.4 Rear Derailleur (Black, Long Cage) is another high-end option from SRAM that is designed for use with the most demanding mountain bikes. It features a long cage design, similar to the Shimano options on this list, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. One downside of the SRAM X.4 Rear Derailleur (Black, Long Cage) is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the SRAM X.4 Rear Derailleur (Black, Long Cage) is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. SHIMANO FD-5703 105 Triple Front Derailleur (10-Speed): The SHIMANO FD-5703 105 Triple Front Derailleur (10-Speed) is a high-quality option from Shimano that is designed for use with road bikes. It features a long cage design, similar to the options on this list, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. One downside of the SHIMANO FD-5703 105 Triple Front Derailleur (10-Speed) is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the SHIMANO FD-5703 105 Triple Front Derailleur (10-Speed) is a high-quality option for anyone looking for a reliable and durable front derailleur that will last for years to come. Shimano Deore XT RD-M786 SGS Shadow Plus Rear Derailleur: The Shimano Deore XT RD-M786 SGS Shadow Plus Rear Derailleur is another high-end option from Shimano that is designed for use with the most demanding mountain bikes. It features a long cage design, similar to the other options on this list, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. One downside of the Shimano Deore XT RD-M786 SGS Shadow Plus Rear Derailleur is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the Shimano Deore XT RD-M786 SGS Shadow Plus Rear Derailleur is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. Shimano Deralleur Part Pulley 105/lx/deore 5700 Pr Upr&lowr: The Shimano Deralleur Part Pulley 105/lx/deore 5700 Pr Upr&lowr is a high-quality option from Shimano that is designed to be used with the other components on this list. It features a long cage design, similar to the options on this list, and has a number of other features that make it stand out from its competitors, including a lightweight design and a smooth shifting action. One downside of the Shimano Deralleur Part Pulley 105/lx/deore 5700 Pr Upr&lowr is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the Shimano Deralleur Part Pulley 105/lx/deore 5700 Pr Upr&lowr is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. SRAM X.7 9-Speed Rear Derailleur Long Cage '11 (Grey): The SRAM X.7 9-Speed Rear Derailleur Long Cage '11 (Grey) is another high-end option from SRAM that is designed for use with the most demanding mountain bikes. It features a long cage design, similar to the options on this list, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. One downside of the SRAM X.7 9-Speed Rear Derailleur Long Cage '11 (Grey) is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the SRAM X.7 9-Speed Rear Derailleur Long Cage '11 (Grey) is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. Shimano SLX RD-M7000 Rear Derailleur: The Shimano SLX RD-M7000 Rear Derailleur is another high-quality option from Shimano that is designed for use with mountain bikes. It features a long cage design, similar to the options on this list, and has a wide range of gears that make it suitable for use with bikes that have wider handlebars or longer wheelbases. One downside of the Shimano SLX RD-M7000 Rear Derailleur is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the Shimano SLX RD-M7000 Rear Derailleur is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. microSHIFT MTB Mezzo Rear Derailleur RD-R45L (Long Cage) 8 / 9 Speed Bicycle Derailleur Compatible for Shimano: The microSHIFT MTB Mezzo Rear Derailleur RD-R45L (Long Cage) 8/9 Speed Bicycle Derailleur Compatible for Shimano is a high-quality option from microSHIFT that is designed to be used with the other components on this list. It features a long cage design, similar to the options on this list, and has a number of other features that make it stand out from its competitors, including a lightweight design and a smooth shifting action. One downside of the microSHIFT MTB Mezzo Rear Derailleur RD-R45L (Long Cage) 8/9 Speed Bicycle Derailleur Compatible for Shimano is its price, which can be quite high for some riders. Additionally, like the other options on this list, it may not be compatible with all bikes or frames, so it's important to check before making a purchase. Overall, however, the microSHIFT MTB Mezzo Rear Derailleur RD-R45L (Long Cage) 8/9 Speed Bicycle Derailleur Compatible for Shimano is a high-quality option for anyone looking for a reliable and durable rear derailleur that will last for years to come. Conclusion: In conclusion, there are many different options available when it comes to mountain bike rear derailleurs. When choosing the right one for your needs, it's important to consider factors such as compatibility with your bike or frame, weight, and price. Shimano and SRAM are two of the most well-known brands in this category, and both offer a wide range of high-quality options that will last for years to come.