How to remove the bottom bracket on a mountain bike is not an overly common question asked by mountain bikers. The first step is to understand that the bottom bracket is a component that securely connects your two crank arms together, at the bottom of the bike frame. While it also allows the crankset to rotate freely.
If you hear a cracking noise from your bottom bracket when you are on your ride, you may need to take out your bottom bracket and re-grease it and then put it back. As the issue may not be the bottom bracket itself. If need to replace your bottom bracket there is a key consideration for any bottom bracket purchase is that the bottom bracket fits with your frame.
In this post, we will go through how to remove the bottom bracket on mountain bikes. Let’s get started!
Read more on common questions asked
- How To Adjust Brake Pads On Bike?
- What Are Some Things Cyclists Do To Reduce Friction?
- What Happens If Bike Chain is Too Long?
- What Is A Bottom Bracket On Your Bike?
- How To Remove Bike Crank Without Puller?
- How Long Does A Bottom Bracket Last?
What Are The Different Types Of Bottom Brackets?
There are two main types of bottom brackets that are used in modern mountain bikes. These are as follows.
- Threaded bottom brackets.
- Pressed fit or threadless bottom brackets.
Threaded Bottom Brackets
As the name suggests these are used in frames that have a threaded bottom bracket shell. The threaded bottom brackets are screwed into the frame. The problem with the threaded bottom brackets is that they are different types such as Italian or English threaded bottom brackets.
When purchasing a threaded bottom bracket you need to know what type exactly for your bike but the positive side is that they are easy to install.
Pressed Fit Or Threadless Bottom Brackets
The threadless bottom brackets or pressed fit bottom brackets are pressed or pushed into your frame’s bottom bracket shell instead of having to screw it in.
The one negative against this type of bottom bracket is that you need special tools to press the bottom bracket into your frame during installation and remove them from the frame.
How Long Should A Bottom Bracket Last?
The answer to your questions is that it depends. Simply the more weight the bike has to carry plus if biking in the rain can reduce the lifespan of the bottom bracket. As it increases the wear and tears faster.
As for how long the bottom bracket lasts on a rough estimate around the 5000 miles they can last for up to 10000 miles. This depends also on how well. the bike is looked after.
Is My Bottom Bracket Worn Out?
The simplest indicator or warning is that the bottom bracket is that there is a creaking noise coming from the cups in the frame. Also if the not crank is not spinning freely you will have to take the bottom bracket out.
Unfortunately, you will never know exactly the right time to inspect or replace the bottom bracket. One way that may indicate that the bottom bracket needs attention is when the noise starts to come from the cups.
Tools and Materials Required
There are a couple of tools and materials needed to replace the bottom brackets These are as follows.
- Bike repair stand
- Lubricant for the chain, gear, and cranks
- Adjustable Torque Allen Key Wrench Tool
- Bottom bracket extractor tool
How To Remove Bottom Bracket On Mountain Bike?
Before removing the bottom bracket you need to ensure that you have the correct bottom bracket type that is used on your bike. Make sure that there is no damage in the area or to any other components in the area.
Let’s get started on removing the bottom bracket.
- Firstly, you need to flip your bike upside down or use a bike stand.
- Now you can remove the cranks. Do this using an Allen key to remove the cracks and remove any washers inside the arm.
- After the Allen bolts are removed. Carefully line up the crank extractor with the threads. Once the crank extractor is firmly in place, turn clockwise on the drive side as to should start to feel the crank being pushed off the gradual.
- With the cranks now removed, it is time to remove the bottom bracket.
- Place the bottom bracket remover onto the left side of the bottom bracket. Turn the left side counter-clockwise.
- Also, repeat on the right side. Turn it clockwise to loosen the cup holding. Now the bottom bracket is removed.
- You need to clean the bottom bracket area as dirt can build in it over time. You may need to scrub but use a degreaser.
- Ensure you have the correct bottom bracket for your bike. Now grease the threads of the bottom bracket.
- Tighten by using your hands. Check from the left side whether it is correctly aligned inside the frame.
- Now you have to reattach the cracks.
- If you are happy will everything reattach? You need to test it out to make sure that everything is working okay.
Finally, if you hear a cracking noise from your bottom bracket when you are out biking, you may just need to take out your bottom bracket and re-grease it, and then put it back. If that doesn’t fix the issue then it may be time to replace the bottom bracket.
If need to replace your bottom bracket there is a key consideration for any bottom bracket purchase is that the bottom bracket fits with your frame.
And that’s it for now! I’d love it if this post on how to remove the bottom bracket on mountain bikes. was helpful to you. Let me know if you have any questions and let me know if there is more to add.