Hey guys! Are you having trouble with your Shimano Tourney TX35? Is it not shifting smoothly or making weird noises? Don't worry, you're not alone! The Shimano Tourney TX35 is a pretty common derailleur found on many entry-level bikes, and like any component, it can wear out or get damaged over time. The good news is that replacing it is a manageable task that you can totally do yourself with the right tools and a bit of know-how. In this guide, we'll walk you through everything you need to know to get your bike shifting like new again. We will explore identifying when a replacement is necessary, selecting the correct replacement, gathering the necessary tools, and performing the replacement. By following these detailed instructions, even novice cyclists can confidently undertake this repair and maintenance task. With the proper knowledge and approach, you can save money, extend the life of your bike, and enjoy smoother, more reliable rides. Before you dive in, it's essential to understand the purpose of the derailleur. The rear derailleur's primary function is to move the chain smoothly between different gears on the cassette, allowing you to adjust the resistance and speed of your pedaling. Over time, the derailleur can become bent, worn, or damaged, leading to poor shifting performance. Recognizing the signs of a failing derailleur is the first step in addressing the issue and restoring your bike's optimal functionality. Understanding the nuances of your bike's components empowers you to keep your ride in top shape. With the right tools and a bit of guidance, you can tackle many common bike maintenance tasks yourself, saving money and gaining a deeper appreciation for the mechanics of cycling.

Identifying When a Replacement Is Necessary

Okay, so how do you know if your Shimano Tourney TX35 actually needs replacing? Here are some telltale signs to watch out for:

• Bent Derailleur Hanger or Body: This is often the most obvious sign. If your derailleur looks visibly bent or twisted, especially after a fall or impact, it's likely compromised. A bent derailleur can cause major shifting problems and can even damage your frame if left unaddressed.
• Difficulty Shifting: Are you struggling to shift gears smoothly? Does the chain hesitate or skip when you try to change gears? This could be due to a number of factors, but a worn or damaged derailleur is a prime suspect. Inconsistent shifting is a key indicator that something is amiss with your drivetrain.
• Excessive Play or Slop: Grab your derailleur and try wiggling it. Does it feel loose or sloppy? A healthy derailleur should have minimal play. Excessive movement indicates worn pivots and bushings, which can negatively affect shifting precision. Worn components lead to imprecise chain movements.
• Noisy Shifting: Is your bike making a lot of clunking, grinding, or clicking noises when you shift? While some noise is normal, excessive or unusual sounds can indicate a problem with your derailleur. Unusual noises during shifting are often a symptom of a damaged or misaligned derailleur.
• Worn or Damaged Pulleys: Take a close look at the derailleur pulleys (the little wheels that the chain runs through). Are they worn down, cracked, or chipped? Damaged pulleys can cause poor shifting and increase wear on your chain and cassette. Damaged pulleys disrupt smooth chain flow.
• Inability to Adjust: Have you tried adjusting your derailleur using the barrel adjuster and limit screws, but you're still unable to get it to shift properly? This could indicate that the derailleur is beyond repair and needs to be replaced. Adjustment difficulties suggest internal damage or wear.

If you're experiencing one or more of these symptoms, it's a good idea to consider replacing your Shimano Tourney TX35. Ignoring these issues can lead to further damage to your bike and a less enjoyable riding experience. Regular inspections and timely replacements are crucial for maintaining optimal cycling performance and ensuring safety on the road or trail. Addressing these issues promptly will not only enhance your riding experience but also extend the lifespan of other drivetrain components.

Selecting the Correct Replacement

Alright, so you've determined that your Shimano Tourney TX35 needs to be replaced. Now, how do you choose the right replacement? Here's what you need to consider:

• Confirm the Model: While it seems obvious, double-check that you are indeed replacing a Shimano Tourney TX35. Look for the model number stamped on the derailleur body. Verifying the model number ensures compatibility.
• Cage Length: Derailleurs come in different cage lengths (short, medium, and long). The cage length determines the derailleur's capacity to handle the range of gears on your cassette and chainrings. For most bikes that come with a Shimano Tourney TX35, a long cage is typically the correct choice. However, it's always a good idea to check your bike's specifications or consult with a bike mechanic to be sure. The cage length is crucial for accommodating the gear range.
• Compatibility: Ensure that the replacement derailleur is compatible with your bike's drivetrain components, including the shifters, cassette, and chain. The Shimano Tourney TX35 is typically paired with other Shimano components, so sticking with Shimano is generally a safe bet. Drivetrain compatibility is essential for proper function.
• Direct Mount vs. Standard Mount: Most Shimano Tourney TX35 derailleurs use a standard mount, which attaches to the derailleur hanger on your frame. However, some newer bikes use a direct mount system. Make sure you choose a replacement derailleur that matches your bike's mounting system. Mount type must match the frame.
• Consider Upgrading: If you're already replacing your derailleur, you might consider upgrading to a higher-level model. While the Shimano Tourney TX35 is a decent entry-level derailleur, there are many other options available that offer improved performance and durability. However, keep in mind that upgrading may also require replacing other components, such as your shifters or cassette. Upgrading components can enhance performance.

Once you've considered these factors, you can start shopping for a replacement derailleur. Online retailers like Amazon and eBay are great places to start, but you can also check with your local bike shop. When purchasing online, make sure to read reviews and check the seller's reputation before making a purchase. Remember, choosing the correct replacement derailleur is crucial for ensuring proper shifting performance and preventing damage to your bike. Taking the time to select the right component will ultimately save you time and money in the long run. It is a small investment that yields significant improvements in your cycling experience.

Gathering the Necessary Tools

Before you start wrenching on your bike, it's important to gather all the necessary tools. Here's a list of what you'll need:

• New Replacement Derailleur: Of course! Make sure you have the correct model and cage length as discussed earlier.
• Allen Wrench Set: Most derailleurs are attached with Allen bolts, so you'll need a set of Allen wrenches in various sizes. A 4mm or 5mm Allen wrench is commonly used for derailleur bolts.
• Cable Cutters: You'll need cable cutters to disconnect the old shift cable and trim the new one. Clean cuts prevent fraying.
• Pliers: Pliers can be helpful for gripping and manipulating the shift cable.
• Screwdrivers: You might need a Phillips or flathead screwdriver to adjust the limit screws on the derailleur.
• Chain Tool: If you need to remove or reinstall your chain, you'll need a chain tool. This is essential if you plan to thoroughly clean your drivetrain during the replacement process.
• Bike Stand (Optional): A bike stand makes the job much easier by allowing you to work on your bike without having to hold it up. Although not strictly necessary, a bike stand significantly improves ease of access.
• Degreaser and Lubricant: This is a great opportunity to clean and lubricate your drivetrain. Use a degreaser to clean the chain, cassette, and chainrings, and then apply a lubricant to keep everything running smoothly. Cleanliness and lubrication enhance performance.
• Rag or Shop Towels: You'll need these to wipe away dirt, grease, and excess lubricant.

Having all the right tools on hand will make the replacement process much smoother and more efficient. Before you begin, take a moment to organize your tools and familiarize yourself with their functions. This will not only save you time but also prevent frustration during the repair process. Investing in quality tools is a wise decision for any cyclist who enjoys maintaining their own bike. Proper tools make the job easier and help prevent damage to your bike's components. With the right tools and a bit of patience, you can tackle many common bike maintenance tasks yourself.

Performing the Replacement

Okay, you've got your new derailleur and all the necessary tools. Now it's time to get to work! Here's a step-by-step guide to replacing your Shimano Tourney TX35:

1. Shift to the Smallest Cog: Shift your bike into the smallest cog on the cassette. This will release tension on the shift cable and make it easier to disconnect.
2. Disconnect the Shift Cable: Use your Allen wrench to loosen the bolt that secures the shift cable to the derailleur. Once the bolt is loose, carefully pull the cable out of the derailleur. Proper cable disconnection is crucial.
3. Remove the Old Derailleur: Use your Allen wrench to remove the bolt that attaches the derailleur to the derailleur hanger. Carefully remove the old derailleur from the frame. Careful removal prevents damage.
4. Clean the Area: Take this opportunity to clean the derailleur hanger and surrounding area with a rag and degreaser. This will help ensure a clean and secure connection for the new derailleur. Cleanliness promotes optimal performance.
5. Install the New Derailleur: Attach the new derailleur to the derailleur hanger and tighten the bolt to the manufacturer's specifications. Make sure the derailleur is properly aligned. Proper alignment ensures smooth shifting.
6. Reattach the Shift Cable: Thread the shift cable through the derailleur and tighten the bolt to secure it. Make sure the cable is properly tensioned. Correct cable tension is vital.
7. Adjust the Limit Screws: Use your screwdriver to adjust the limit screws on the derailleur. The limit screws prevent the chain from shifting off the cassette. Precise adjustment is essential.
8. Adjust Cable Tension: Use the barrel adjuster on the derailleur or shifter to fine-tune the cable tension. You want the chain to shift smoothly and accurately between all gears. Fine-tuning ensures optimal performance.
9. Test the Shifting: Shift through all the gears to make sure the derailleur is working properly. If you're having trouble, double-check your cable tension and limit screw adjustments. Thorough testing is crucial.
10. Trim the Shift Cable: Use your cable cutters to trim the excess shift cable. Leave a few inches of cable beyond the bolt, and then crimp the end with a ferrule to prevent fraying. Proper cable trimming prevents fraying.

That's it! You've successfully replaced your Shimano Tourney TX35. Now go out and enjoy a smooth and reliable ride! Remember to check your work and make any necessary adjustments after your first few rides. Regular maintenance and timely replacements will keep your bike running smoothly for years to come. With a little practice, you'll become a pro at bike maintenance in no time! Don't hesitate to consult with a bike mechanic if you encounter any difficulties during the replacement process. Professional assistance can save you time and prevent potential damage to your bike.