how to install rear derailleur mountain bike

How to Install a Rear Derailleur on a Mountain Bike

Installing a rear derailleur on your mountain bike can seem intimidating, but with the right tools and a bit of guidance, you can do it yourself. The rear derailleur is crucial for precise shifting and overall bike performance, so a proper installation is key. Below, we will walk you through the steps to successfully install a rear derailleur.

Tools You Will Need

1. Screwdriver - To adjust screws if needed. 2. Allen wrenches - To secure the derailleur to the hanger. 3. Cable cutter - For trimming the derailleur cable. 4. Chain tool - If you need to remove or adjust the chain. 5. Bike stand (optional) - To hold your bike in place while you work.

Step 1 Gather Your Components

Before you start, ensure you have the new rear derailleur you wish to install, a derailleur hanger if needed, and a compatible shifter and brake cable. Check that your new derailleur is designed to work with your bike’s drivetrain (for example, 9-speed, 10-speed, or 11-speed systems).

If you are replacing an existing derailleur, you’ll need to remove it first. Start by using the appropriate Allen wrench to take off the mounting bolt securing the derailleur to the derailleur hanger. Then, disconnect the derailleur cable by loosening the anchor bolt. If the chain is still attached to the derailleur, you can remove it using a chain tool or just leave the chain in place to save time.

Step 3 Attach the New Derailleur

Position the new derailleur onto the derailleur hanger. Make sure the upper pulley is aligned correctly with the cassette. Use the Allen wrench to tighten the mounting bolt securely but be careful not to over-tighten it, as this could damage the derailleur hanger.

Step 4 Install the Derailleur Cable

Once the derailleur is securely attached, you need to route the derailleur cable. Feed the cable through the housing and attach it to the derailleur. Tighten the anchor bolt to secure the cable. Make sure the cable runs freely without any twists or sharp bends.

Step 5 Set the Limit Screws

The next step is to adjust the limit screws on your new derailleur. There are typically two limit screws labeled “H” (high) and “L” (low). The high limit screw controls how far the derailleur can move towards the smallest cog, while the low limit screw controls movement towards the largest cog. Shift to the smallest cog and adjust the high limit screw until the derailleur just clears the cog without rubbing. Repeat this process for the low limit screw while shifting to the largest cog.

Step 6 Fine-tune the Cable Tension

After adjusting the limit screws, it’s time to fine-tune the cable tension. Shift through the gears to see how smooth the transitions are. If the shifts are slow or skipping, you may need to adjust the barrel adjuster on your shifter to increase or decrease tension.

Step 7 Test Ride

Finally, it’s essential to test ride your bike. Check each gear to ensure smooth and accurate shifting. If you experience any issues, revisit your limit screw and cable tension adjustments.

Conclusion

Installing a rear derailleur on a mountain bike requires some patience and a few basic tools, but it’s a rewarding task that can enhance your riding experience. With a little practice, you can do it yourself and enjoy the satisfaction that comes from knowing your bike is running at its best. Happy cycling!