Introduction
Shimano Altus rear derailleurs are renowned for their smooth shifting, reliable performance, and long-lasting durability. They are lightweight components that feature a simple design and easy maintenance. Adjusting a Shimano Altus rear derailleur is a straightforward process, and it is an essential part of bike maintenance. This guide will explain the steps required to adjust a Shimano Altus rear derailleur and ensure that it shifts smoothly and accurately.
Tools and Materials Needed
To adjust a Shimano Altus rear derailleur, you will need the following tools and materials:
- Screwdriver
- Cable cutters
- Allen key
- Chain whip
- Cable ties
- Chain lubricant
Step 1: Remove the Old Cable
The first step in the process is to remove the old cable from the derailleur. Begin by using the cable cutters to cut the cable near the derailleur. Next, use a screwdriver to remove the cable from the derailleur. Once the cable has been removed, make sure that the derailleur is free of any debris or dirt.
Step 2: Adjust the High and Low Limit Screws
The next step is to adjust the high and low limit screws on the derailleur. These screws are located at the back of the derailleur and are used to adjust the maximum and minimum sizes of the chainrings. To adjust the high limit screw, turn the screw clockwise until it stops. To adjust the low limit screw, turn the screw counterclockwise until it stops.
Step 3: Adjust the B-Tension Screw
The B-tension screw is used to adjust the tension of the chain on the largest chainring. To adjust the B-tension screw, turn the screw clockwise until it stops. Make sure that the chain is still able to move freely between the chainrings.
Step 4: Install the New Cable
The next step is to install the new cable. Use the cable ties to secure the new cable to the derailleur. Make sure that the cable is routed correctly and that it is not kinked or twisted. Once the cable is installed, use the Allen key to adjust the cable tension. Turn the Allen key clockwise until the chain shifts smoothly and accurately between the chainrings.
Step 5: Lubricate the Chain
The final step is to lubricate the chain. Use a chain lubricant to lubricate the chain. Apply the lubricant liberally to all of the links in the chain and make sure that it is evenly distributed. This will help to ensure that the chain shifts smoothly and accurately between the chainrings.
Frequently Asked Questions
Q1: What is the purpose of a derailleur?
A derailleur is a component of a bicycle that is used to change gears. It is a complex system of pulleys, springs, and cables that move the chain from one gear to another.
Q2: Is it necessary to lubricate a bicycle chain?
Yes, it is important to lubricate a bicycle chain regularly in order to keep it running smoothly and reduce wear and tear on the components.
Q3: How often should I adjust my derailleur?
It is recommended that you adjust your derailleur every 3-6 months or whenever you notice that it is not shifting smoothly or accurately.
Q4: What happens if I don't adjust my derailleur?
If you don't adjust your derailleur, it may not shift properly and could cause damage to the drivetrain components.
Q5: What tool do I need to adjust my derailleur?
You will need an Allen key and a screwdriver to adjust your derailleur.
Q6: Can I adjust the derailleur on my own?
Yes, you can adjust the derailleur on your own by following the steps outlined in this guide.
Q7: What is a B-tension screw?
A B-tension screw is a small screw located on the rear derailleur that adjusts the tension of the chain on the largest chainring.
Q8: How do I know if the derailleur needs adjusting?
If you notice that the chain is slipping or not shifting smoothly, then it is likely that the derailleur needs adjusting.
Q9: What is the purpose of a high limit screw?
The high limit screw is used to adjust the maximum size of the chainrings on a derailleur.
Q10: What is the purpose of a low limit screw?
The low limit screw is used to adjust the minimum size of the chainrings on a derailleur.
Q11: What is the difference between a high and low limit screw?
The high limit screw is used to adjust the maximum size of the chainrings and the low limit screw is used to adjust the minimum size of the chainrings.
Q12: What type of lubricant should I use on my chain?
It is recommended that you use a high-quality bicycle chain lubricant when lubricating your chain.
Q13: How do I know if my chain is properly lubricated?
If your chain is properly lubricated, it should move smoothly and without any resistance.
Q14: How do I know if the cable is installed correctly?
Make sure that the cable is routed correctly and that it is not kinked or twisted. Once the cable is installed, use the Allen key to adjust the cable tension.
Q15: Is it necessary to replace the cable?
Yes, it is recommended that you replace the cable every 6-12 months.
Q16: What happens if I don't replace the cable?
If you don't replace the cable, it may become frayed or worn and may not shift properly.
Q17: What is the purpose of a chain whip?
A chain whip is a tool used to hold the chain in place while adjusting the derailleur.
Q18: How do I know if the derailleur is adjusted correctly?
If the derailleur is adjusted correctly, it should shift smoothly and accurately between the chainrings.
Q19: How often should I check my derailleur?
It is recommended that you check your derailleur every 3-6 months or whenever you notice an issue with shifting.
Q20: What should I do if my derailleur is not shifting correctly?
If your derailleur is not shifting correctly, it is likely that it needs adjusting. Follow the steps in this guide to adjust the derailleur.