Now I have the tutorial that will be help you how to setup and to adjust properly and to understand each component of derailleur works.
Most future adjustments can be done by hand with if the derailleur is set up correctly
Let’s get started!
Tools preparation
Please prepare the tooling :
1. Allen wrench 5mm
2. A light lubricant
3. Phillips screwdriver
4. Rag
Derailleur works
Basic way, all modern deralleurs function almost same.
The derailleurs are design to derail or moving the chain from sprocket to the next.
The jockey polley (upper guide pulley) moves the chain in both directions.
For example, when we goes on uphill road, we need to shift down to lower gear.
Pulls the shift cable and forces the guide pulley to change to a bigger sprocket
When we goes on straight road and want to go faster, need to adjust the shifter to a higher gear. Realeases shift cable tension and allows the deraileur springs to pull the guide pulley back down to a smaller gear.
The length of chain will change when we shift the gears.
The lower tension pulley is spring-loaded to take up this slack.
Limit Screws
There are 3 type of adjustment screws:
1. B-tension adjustment (the B-screw)
2. High gear limit stop (the H-screw)
3. Low gear limit stop (the L-screw)
Should always be made in ¼ turn increments to adjust on these screws
B-Tension Adjustment
The B-Screw controls the derailleur body’s angle in relation to the sprocket-set.
Shift down to the largest sprocket and check the distance between the guide pulley and the large sprocket.
If the guide pulley is rubbing on the sprocket, tighten the B-screw clockwise to increase tension and move the pulley away from the sprocket.
If there is a large gap between the pulley and sprocket, loosen the B-screw until the pulley rubs the sprocket, and then tighten it until it just clears.
High Gear Limit Stop
The H-Limit screw high gear limit stop prevents the guide pulley from shifting any further past the highest gear and into the axle.
In order to adjust it properly there must be no tension on the lower inner cable.
If you feel tension, loosen the cable adjuster until there is none.
Now check from behind how the chain is riding on the smallest sprocket. If it looks like it wants ride off into the axle, tighten the H-screw clockwise until it lines up.
If it looks like it is rubbing on the next gear, loosen the screw until the chain is nicely centered on the sprocket.
Now re-adjust the cable tension until the derailleur shifts smoothly down to the next gear.
Low Gear Limit Stop
The L-Limit screw prevents the guide pulley from shifting any further past the lowest gear and into the wheel spokes.
Shift down to the lowest gear, step behind the bike, and check how the chain rides on the sprocket. If it looks like it wants to ride into the spokes, tighten the L-screw clockwise until it is centered on the sprocket. If it looks like it wants to shift down, loosen the screw until it lines up.
As an extra precaution you can use your thumb to gently push the derailleur body and make sure the chain will not run into the spokes, as this could obviously have a nasty effect on both you and your bike.
Cable Adjustment
The cable tension adjuster defines how far up or down the derailleur moves.
Step back so you can see the chain and sprocket alignment, and then through the gears in both directions, first shifting up two and down one, and then down two and up one.
The chain should look centered on each sprocket. If it is rubbing on a larger gear it means there is too much tension on the cable. Loosen the tension by turning the adjuster clockwise.
If it wants to jump down to a smaller gear it needs more tension. Increase the tension by turning the adjuster counter-clockwise.
You can also use sound to check the adjustment. There is always a base-level of noise that can be heard in every gear.
This noise will increase in a slightly different way depending on which way the tension is out of adjustment. If there is too much tension you will hear a metallic rubbing sound, but if there is too little tension you will hear a clicking noise as the chain tries to jump to a smaller sprocket.
In order to adjust it properly there must be no tension on the lower inner cable.
If you feel tension, loosen the cable adjuster until there is none.
Now check from behind how the chain is riding on the smallest sprocket. If it looks like it wants ride off into the axle, tighten the H-screw clockwise until it lines up.
If it looks like it is rubbing on the next gear, loosen the screw until the chain is nicely centered on the sprocket.
Now re-adjust the cable tension until the derailleur shifts smoothly down to the next gear.
Low Gear Limit Stop
The L-Limit screw prevents the guide pulley from shifting any further past the lowest gear and into the wheel spokes.
Shift down to the lowest gear, step behind the bike, and check how the chain rides on the sprocket. If it looks like it wants to ride into the spokes, tighten the L-screw clockwise until it is centered on the sprocket. If it looks like it wants to shift down, loosen the screw until it lines up.
As an extra precaution you can use your thumb to gently push the derailleur body and make sure the chain will not run into the spokes, as this could obviously have a nasty effect on both you and your bike.
Cable Adjustment
The cable tension adjuster defines how far up or down the derailleur moves.
Step back so you can see the chain and sprocket alignment, and then through the gears in both directions, first shifting up two and down one, and then down two and up one.
The chain should look centered on each sprocket. If it is rubbing on a larger gear it means there is too much tension on the cable. Loosen the tension by turning the adjuster clockwise.
If it wants to jump down to a smaller gear it needs more tension. Increase the tension by turning the adjuster counter-clockwise.
You can also use sound to check the adjustment. There is always a base-level of noise that can be heard in every gear.
This noise will increase in a slightly different way depending on which way the tension is out of adjustment. If there is too much tension you will hear a metallic rubbing sound, but if there is too little tension you will hear a clicking noise as the chain tries to jump to a smaller sprocket.
There is usually a cable tension adjuster on your shift lever. With practice you will be able to make small cable tension adjustments while you are riding.
Lubrication
Now that the derailleur is adjusted, always apply a drop of lubrication to the derailleur’s many moving parts. This will help prevent wear from dirt and rust, and it will keep your gears shifting smoothly.
Wipe away any excess lube and take your bike for a test ride to make sure all the gears are working smoothly.
Lubrication
Now that the derailleur is adjusted, always apply a drop of lubrication to the derailleur’s many moving parts. This will help prevent wear from dirt and rust, and it will keep your gears shifting smoothly.
Wipe away any excess lube and take your bike for a test ride to make sure all the gears are working smoothly.
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