HOW TO ADJUST YOUR MOUNTAIN BIKE DERAILLEUR YOURSELF
Do you notice your mountain bike shifting less smoothly or that the chain is clicking while riding? Chances are your derailleur needs a minor adjustment. You can fix this yourself with a few simple steps. It's quick, easy, and doesn't require any tools from a professional workshop. We'll explain step by step how to perfectly adjust your Shimano derailleur.
Why adjusting your derailleur is important
The derailleur is the part that moves your chain across the various sprockets. If it's not adjusted properly, your bike will shift too slowly, the chain will skip, or it will drag. Especially when mountain biking, where you often shift on uneven terrain, precise adjustment is essential. A properly adjusted derailleur not only ensures smooth shifting but also extends the life of your drivetrain.
Step 1: Check the derailleur hanger
The derailleur hanger (the part where the derailleur attaches to the frame) should be perfectly straight. A fall or impact can bend this part, making shifting impossible. Check from the back of your bike whether the derailleur is aligned with the cog. If not, it's wise to visit our CUBE Stores, where we have the right tools to fix it.
Step 2: Adjust the end stops
Your derailleur has two small screws: the H and L adjustment screws.
- The H screw determines how far the derailleur can move outward (towards the smallest cog).
- The L-screw determines the inner limit (towards the largest gear).
Carefully turn these screws so that the derailleur is positioned directly above the smallest and largest cogs. This prevents the chain from sliding off the cog.
Step 3: Fine-tune cable tension
Cable tension determines how quickly your derailleur responds to the shifter. Is your chain shifting too slowly to a larger cog? Then the tension may need to be increased. Is it slow to shift down to a smaller cog? Then the tension is too high.
Use the adjustment wheel on your shifter or derailleur and turn it a quarter turn at a time. Test it through all the gears in between. Small adjustments often make a big difference.
Step 4: Check your chain and cassette
A poorly adjusted derailleur can also be caused by a worn chain or cassette. If the teeth are sharp or unevenly worn, the chain won't engage properly. In that case, adjustment won't help, and it's time to replace components.
Our CUBE Stores have a large stock of original Shimano parts and our mechanics are happy to help you with installation or advice.
Step 5: Test and fine-tune
Place your bike on a stand or hang it up and gently shift through the gears. The chain should shift smoothly, quietly, and effortlessly between cogs. Do you still hear slight clicking? Then you can make the final fine-tuning with small quarter-turns of the adjusting wheel.
When everything runs smoothly, you're ready for the next ride. No hiccups, and with the familiar feeling of a perfectly tuned drivetrain.