Hey bike enthusiasts! Today, we're diving deep into the Shimano Deore XT RD-M772, a legendary 9-speed rear derailleur that's still kicking around and beloved by many. This guide is your one-stop shop for everything you need to know, from its features and performance to maintenance and repair. Whether you're a seasoned mechanic or just getting started, we'll break down the essentials in a way that's easy to understand. So, grab your tools (or your favorite beverage), and let's get rolling!

What Makes the Shimano Deore XT RD-M772 Special?

First off, let's talk about what makes the Shimano Deore XT RD-M772 such a popular choice, even years after its initial release. This rear derailleur was a workhorse, designed for durability, precision, and smooth shifting across a wide range of terrains. Its rugged construction and thoughtful design have made it a favorite among mountain bikers and recreational riders alike. It's built to withstand the rigors of off-road adventures, making it a reliable choice for those who demand performance and longevity from their components. The Shimano Deore XT RD-M772 is known for its Shadow design, which tucks the derailleur body closer to the frame, reducing the risk of damage from trail hazards like rocks and roots. This design also improves shifting performance by minimizing chain slap and providing a more direct shifting feel. The use of high-quality materials and precise engineering ensures that the derailleur operates smoothly and efficiently, even under heavy loads or in challenging conditions. The combination of these features makes the RD-M772 a standout performer, well-regarded for its reliability and ability to deliver consistent shifting performance. The focus on durability and performance is what has made this derailleur a favorite among riders.

Key Features and Benefits

• Shadow Design: This is a big one! The low-profile design reduces the chance of the derailleur hitting obstacles and keeps it out of harm's way. This is a crucial feature for anyone who rides on trails with rocks, roots, or other potential hazards. It not only protects the derailleur but also improves shifting performance by reducing chain slap and providing a more direct feel. The Shadow design is a testament to Shimano's commitment to creating components that can withstand the demands of off-road riding, offering peace of mind to riders who want to focus on the trail rather than worrying about their equipment.
• Direct Mount: While not all frames are compatible, the direct mount option offers a more secure and precise connection to the frame, which can enhance shifting accuracy. This mounting system provides a stiffer and more stable platform for the derailleur, reducing flex and improving the overall shifting performance. This is especially beneficial for riders who demand the most from their equipment and want to ensure that every shift is crisp and precise. The direct mount option also contributes to the overall durability and reliability of the derailleur, making it an excellent choice for serious riders.
• Smooth Shifting: Shimano is known for its smooth and precise shifting, and the RD-M772 is no exception. This derailleur is designed to work seamlessly with Shimano 9-speed shifters and cassettes, providing accurate and consistent gear changes. This is due to the careful engineering and precise manufacturing processes that Shimano employs, ensuring that every component works in perfect harmony. The smooth shifting action makes it easy for riders to find the right gear, whether they're climbing a steep hill or cruising on a flat section of trail. This contributes to a more enjoyable and efficient riding experience, allowing riders to focus on their performance and the trail ahead.
• Durable Construction: Built to last! The RD-M772 uses high-quality materials and a robust design to withstand the demands of off-road riding. This durability means that the derailleur can handle the bumps, impacts, and stresses of challenging trails. The robust construction ensures that the derailleur will perform consistently and reliably, even under the most demanding conditions. This is a critical factor for riders who want components that can keep up with their riding style and last for years to come. The emphasis on durability is a key element of the RD-M772's design, making it a reliable and long-lasting choice for serious riders.

Compatibility: What Bikes and Components Work with the RD-M772?

Alright, let's talk about compatibility. The Shimano Deore XT RD-M772 is designed for 9-speed drivetrains, so that means it'll work best with 9-speed cassettes, chains, and shifters. You'll want to make sure your other components are also 9-speed compatible to ensure smooth and accurate shifting. It is best to use Shimano shifters, but in some cases, you can use other brands such as Sram.

Matching Components

• Cassette: Any Shimano 9-speed cassette will work perfectly. Ensure the cassette has the same number of cogs as your shifter indicates. You can also use compatible cassettes from other brands, but make sure the spacing is the same.
• Chain: A 9-speed chain is a must! Using the correct chain ensures that your shifting is as smooth as possible and that your drivetrain lasts longer. Using a chain that is the wrong size can cause the chain to not shift correctly or damage other components. Make sure to choose a chain that is designed for 9-speed drivetrains to ensure optimal performance and durability.
• Shifters: Shimano 9-speed shifters are ideal. SRAM 9-speed shifters can sometimes work, but compatibility isn't guaranteed. Shifters are an important component in the shifting process, and the correct shifters will ensure that you have accurate and efficient gear changes.

Frame Compatibility

Check your bike frame for compatibility. The RD-M772 can work with standard derailleur hangers or, if your frame supports it, the direct mount system. This versatility makes it suitable for a wide range of bikes. The choice of mount system will depend on your frame design, so make sure to check your bike's specifications before you make any changes.

Setting Up and Adjusting Your RD-M772

So, you've got your Shimano Deore XT RD-M772, awesome! Now, let's get it set up and dialed in for optimal performance. This section will guide you through the process, from mounting to fine-tuning. Getting your derailleur set up correctly is the key to smooth shifting. Take your time, follow these steps, and you'll be riding smoothly in no time.

Mounting the Derailleur

1. Attach to the Hanger: If your frame uses a standard derailleur hanger, simply align the derailleur and screw it into place. Tighten the bolt securely, but don't overtighten it. Overtightening can damage the hanger or the derailleur itself. Make sure the derailleur is properly aligned with the cassette cogs. The hanger must be straight to allow smooth shifting across all the gears. If the hanger is bent, it will affect the performance of your derailleur.
2. Direct Mount: If your frame is direct-mount compatible, remove the hanger and attach the derailleur directly to the frame. The direct mount system provides a more stable and secure connection, improving shifting accuracy.
3. Cable Routing: Make sure the derailleur cable is routed correctly through the frame and attached to the derailleur. Ensure the cable is free of kinks and runs smoothly to allow for proper function.

Adjusting the Derailleur

1. Limit Screws: These screws (marked 'H' for high gear and 'L' for low gear) determine the range of the derailleur. The high limit screw stops the derailleur from moving beyond the smallest cog, and the low limit screw prevents it from going past the largest cog. Adjust these screws so the chain aligns perfectly with the smallest and largest cogs.
2. Cable Tension: Adjust the barrel adjuster on your shifter or derailleur to fine-tune the cable tension. Too much tension can cause the derailleur to shift past the intended gear, while too little tension will make it struggle to move up the cassette. Adjust the barrel adjuster to the correct tension, so you get smooth and accurate shifting across all gears.
3. B-Tension Screw: This screw adjusts the distance between the upper pulley wheel and the cassette. It impacts shifting performance, particularly in the lower gears. Use the B-tension screw to set the correct gap. The correct gap will depend on the size of your cassette. Follow Shimano's recommendations or the instructions provided with your derailleur.

Troubleshooting Common Issues

Even the best components can run into issues. Here's how to troubleshoot some common problems with the Shimano Deore XT RD-M772.

Skipping Gears

Skipping gears can be super annoying! This is often caused by incorrect cable tension, a bent derailleur hanger, or a worn chain/cassette. Check the cable tension first. If that doesn't fix it, inspect the hanger. A bent hanger can significantly impact shifting performance, so it must be straight. Finally, inspect your chain and cassette for wear and tear, and replace them if needed.

Sluggish Shifting

Sluggish shifting can be the result of a few things. A sticky cable, dirty pivots, or a bent derailleur can slow down your shifting. Lubricate the cable and pivots. Make sure the pivots are clean and well lubricated. Inspect the derailleur for any damage. Check the cable for any kinks or damage.

Chain Noise

Chain noise can be caused by the chain not being properly aligned, cable tension, or a dirty chain. Make sure the chain is aligned correctly with the cassette cogs. Adjust the cable tension. Clean and lubricate the chain to reduce friction and noise.

Maintenance: Keeping Your RD-M772 in Top Shape

Regular maintenance is crucial for keeping your Shimano Deore XT RD-M772 running smoothly and extending its lifespan. Here's what you need to do.

Cleaning and Lubrication

• Cleaning: Regularly clean your derailleur, especially after muddy or dusty rides. Remove any dirt or grime with a brush and degreaser. Cleaning your derailleur removes dirt and grime that can impede performance and cause premature wear. Be thorough, but avoid using harsh chemicals that could damage the components.
• Lubrication: Apply a high-quality lubricant to the pivot points. This helps reduce friction and ensures smooth movement. Use a lubricant specifically designed for bike components to provide the best protection and performance. Wipe away any excess lubricant to prevent attracting dirt and grime.

Chain Care

Keep your chain clean and lubricated. This reduces wear and tear on your chain and cassette, as well as the derailleur itself. Regularly cleaning and lubricating your chain will make your drivetrain last longer and run more efficiently.

Inspection

Regularly inspect the derailleur for damage, wear, and tear. Check the derailleur cage, pulleys, and the hanger for any signs of damage or wear. Inspecting your derailleur will allow you to catch potential problems before they get worse. Replace worn or damaged components promptly.

Repairing Your Shimano Deore XT RD-M772: What to Do

Sometimes, things break. Here's a quick guide to some common repairs.

Replacing a Bent Hanger

A bent derailleur hanger can cause major shifting problems. Luckily, it's usually easy to replace. Simply remove the old hanger and install a new one. Make sure to use the correct hanger type for your frame. The hanger can bend from impacts with rocks or other objects, so it is important to inspect it regularly.

Replacing Pulleys

Pulleys wear out over time. To replace them, simply remove the old pulleys and install new ones. Make sure to choose pulleys that are compatible with your derailleur. Worn pulleys can cause shifting problems and affect overall drivetrain performance. Replace the pulleys when the teeth start to wear down.

Replacing the Derailleur

If the derailleur body is damaged beyond repair, you'll need to replace the entire unit. Replacing the entire unit can happen due to impacts or extreme wear. When replacing the derailleur, make sure you choose a compatible model and follow the setup instructions. While the Shimano Deore XT RD-M772 is known for its durability, it is still possible to damage it beyond repair. Replacing the derailleur is the last resort, but it's sometimes necessary.

Upgrading and Alternatives to the RD-M772

If you're looking to upgrade, or if the RD-M772 just isn't cutting it anymore, here are some options.

Modern Derailleurs

Consider upgrading to a newer Shimano rear derailleur for improved performance. The newer models offer advancements in shifting technology and features. Shimano has released a variety of rear derailleurs with many improvements, such as improved shifting speed, and durability. Newer derailleurs are compatible with more gears and offer a wider range of gearing options. The benefits of newer models include faster shifting, improved durability, and compatibility with wider-range cassettes.

Other Brands

While Shimano is the dominant player, there are other brands to consider. SRAM offers quality options, too. SRAM derailleurs provide a different feel and shifting characteristics than Shimano. They can be a good option if you prefer a different shifting style. SRAM has a variety of rear derailleurs to fit your budget. Other brands to consider include Box Components and Microshift. These brands offer a range of options with unique features and technologies.

Conclusion: Keeping Your Ride Smooth

There you have it! The Shimano Deore XT RD-M772, a great rear derailleur for 9-speed drivetrains. By following the tips in this guide, you can keep your bike shifting smoothly and enjoy countless miles on the trails. Remember, regular maintenance is key, and don't be afraid to get your hands dirty and learn about your bike! Happy riding!