how to install rear derailleur mountain bike

How to Install a Rear Derailleur on a Mountain Bike

Installing a rear derailleur on a mountain bike is a task that can enhance your bike's shifting performance and overall riding experience. Whether you're replacing a damaged derailleur or upgrading to a better model, the process is straightforward if you follow these steps carefully.

Tools Required Before you start, gather the following tools - 5mm Allen wrench - Phillips screwdriver - Torque wrench (optional) - Chain tool (if you need to adjust the chain)

Step 1 Remove the Old Derailleur First, place your bike on a stable bike stand to keep it secure. Shift the chain onto the smallest chainring and biggest rear cog to relieve tension on the derailleur. Use the 5mm Allen wrench to remove the bolt securing the derailleur to the derailleur hanger. Carefully detach the derailleur from the hanger and remove the chain from the derailleur's jockey wheels.

Step 2 Prepare the New Derailleur Unbox your new derailleur and ensure it’s compatible with your bike’s drivetrain (speed and type). Inspect the derailleur for any packaging materials or protective covers that need to be removed.

Step 3 Attach the New Derailleur Position the new derailleur on the derailleur hanger. Ensure that the mounting holes align correctly. Insert the bolt and hand-tighten it to secure the derailleur in place. If available, use a torque wrench to tighten it to the manufacturer's specifications to avoid overtightening, which can damage the hanger.

Step 4 Re-Install the Chain Thread the chain through the new derailleur's jockey wheels, ensuring it follows the proper path. The chain should run from the chainring to the top jockey wheel, then down to the bottom jockey wheel, and back to the rear cog.

Step 5 Adjust the Derailleur Once the chain is in place, it's time to adjust the derailleur. Use the limit screws to prevent the chain from shifting off the smallest and largest cogs. Next, adjust the cable tension pull the cable tight and secure it in place with the clamp screw.

Step 6 Fine-Tune Shifting After everything is secured, test the shifting by cycling through the gears. If shifts are sluggish or miss gears, you may need to fine-tune the cable tension using the barrel adjuster on the derailleur.

Conclusion Installing a rear derailleur on your mountain bike is a rewarding DIY task. With patience and attention to detail, you can enhance your bike’s performance and enjoy smoother rides. Happy cycling!