Removing the crank from a bicycle is a relatively simple task that can be completed in a few minutes with the right tools. However, if you’re not familiar with the process, it’s easy to make a mistake that could damage your bike. That’s why it’s important to follow the steps in this guide carefully. Furthermore, before you begin, gather the necessary tools, including a crank puller, a 5mm Allen key, and a chain whip. Additionally, make sure your bike is securely placed in a stand or on a level surface.
First, remove the pedals from the crank arms. To do this, use a 15mm wrench to loosen the pedals, then turn them by hand until they come off. Next, use a 5mm Allen key to remove the pinch bolts that hold the crank arms to the spindle. There are usually two or three pinch bolts on each crank arm. Once the pinch bolts are removed, you can use the crank puller to remove the crank arms from the spindle. To do this, attach the crank puller to the crank arm and tighten the bolt. Then, turn the crank puller bolt until the crank arm comes off. Repeat this process for the other crank arm.
Finally, clean the spindle and crank arms before reassembling the crank. To do this, use a degreaser and a rag to remove any dirt or grease. Once the parts are clean, apply a small amount of grease to the spindle and the crank arms. Then, reassemble the crank by reversing the steps you took to remove it. Once the crank is reassembled, tighten the pinch bolts and pedals to the desired torque.
The Importance of Removing Bicycle Cranks
Removing bicycle cranks is a crucial maintenance task that every cyclist should be familiar with. It allows for the inspection, cleaning, and replacement of worn or damaged components, ensuring optimal performance and safety. Here are several key reasons why it’s essential to remove bicycle cranks:
- Maintenance and Inspection: Over time, bicycle cranks can accumulate dirt, grime, and wear, which can affect their efficiency and lifespan. Removing the cranks allows for thorough cleaning and inspection, enabling you to identify any issues or potential problems before they become major failures.
- Component Replacement: Worn or damaged bicycle cranks may need to be replaced to restore optimal functionality and safety. Removing the cranks is necessary to access and replace these components, ensuring that your bike operates smoothly.
- Drivetrain Adjustments: Properly adjusted bicycle cranks are essential for efficient power transfer and comfortable riding. Removing the cranks allows for adjustments to the bottom bracket, chainring alignment, and pedal position, optimizing the bike’s drivetrain performance.
- Installation of Accessories: Some accessories, such as power meters and chain catchers, require the removal of bicycle cranks for proper installation. Removing the cranks provides access to the necessary mounting points and ensures that the accessories are securely attached.
| Purpose | Importance |
|---|---|
| Maintenance and Inspection | Ensures optimal performance and safety |
| Component Replacement | Facilitates the replacement of worn or damaged components |
| Drivetrain Adjustments | Optimizes the bike’s drivetrain performance |
| Installation of Accessories | Allows for the proper installation of various accessories |
Tools Required for Crank Removal
Kickstart your bicycle maintenance journey with the essential tools for crank removal. Gather the following arsenal to ensure a smooth and successful process.
2. Crank Extractor
This specialized tool is crucial for extracting the crank arm from the bottom bracket spindle. There are two main types of crank extractors:
| Type | Description |
|---|---|
| Center-mounted | Screws into the crank arm extractor typically in the center which is aligned with the crank arm and spindle threads. |
| Side-mounted | Attaches to the side of the crank arm and engages with the spindle threads. |
Select an extractor compatible with your crank arm type and ensure it securely fits into the crank arm threads. The crank extractor serves as the primary mechanism for disengaging the crank arm from the spindle, making it an indispensable tool in the crank removal process.
Safety Precautions to Consider
1. Wear Safety Glasses
When removing the bicycle crank, it is important to wear safety glasses. This will protect your eyes from any flying debris or metal shavings that may be generated during the process.
2. Use the Correct Tools
It is essential to use the correct tools when removing the bicycle crank. A crank puller is specifically designed for this task and will help you to remove the crank safely and efficiently.
3. Secure the Bicycle
Before you begin removing the crank, it is important to secure the bicycle. This will prevent it from moving or wobbling while you are working. You can do this by placing the bicycle on a work stand or by leaning it against a wall.
Additional Details for Securing the Bicycle
- Use a work stand: A work stand is the most stable option for securing your bicycle. It will hold the bike securely in place, allowing you to work on it with both hands.
- Lean against a wall: If you do not have a work stand, you can lean the bicycle against a wall. However, it is important to make sure that the wall is stable and that the bicycle is securely propped against it.
- Use a bike stand: A bike stand is a portable option that can be used to secure your bicycle in a variety of locations. It is not as stable as a work stand, but it is still a good option if you do not have access to one.
- Clamp the bicycle frame: If you do not have any of the above options, you can clamp the bicycle frame to a sturdy object. This will help to prevent the bicycle from moving while you are working on it.
Determining the Crank Type
Identifying Different Crank Types
To determine your crank type, examine the spindle interface where the pedals attach to the cranks. There are three main crank types:
Square Taper Cranks
Square taper cranks are the most common type on entry-level and mid-range bikes. They feature a square-shaped spindle that fits into a matching hole in the crank arm. Square taper cranks are relatively easy to remove, but they are also prone to creaking and premature wear.
Octalink Cranks
Octalink cranks are a more advanced version of square taper cranks. They use a splined spindle that engages with a matching spline in the crank arm. Octalink cranks are more durable and less prone to creaking than square taper cranks, but they can be more difficult to remove.
ISIS Cranks
ISIS cranks are a newer type of crank that is becoming increasingly common on higher-end bikes. They use a threaded spindle that screws into a threaded hole in the crank arm. ISIS cranks are the most secure and durable crank type, but they can also be the most difficult to remove.
Here is a table summarizing the key differences between the three crank types:
| Crank Type | Spindle Type | Pros | Cons |
|---|---|---|---|
| Square Taper | Square | Easy to remove | Prone to creaking, premature wear |
| Octalink | Splined | Durable, less prone to creaking | More difficult to remove |
| ISIS | Threaded | Secure, durable | Most difficult to remove |
Removing a Square Taper Crank
A square taper crank is one of the most common types of bicycle cranks. It is held in place by a wedge-shaped bolt that fits into a square taper on the crank spindle. To remove a square taper crank, you will need a crank puller.
1. Insert the crank puller
The crank puller has two jaws that fit around the crank arm. Insert the jaws into the square taper and tighten the bolt until the jaws are tight against the crank arm.
2. Tighten the puller bolt
Tighten the puller bolt until the crank arm loosens. You may need to use a lot of force to loosen the crank arm.
3. Remove the crank arm
Once the crank arm is loose, you can remove it by hand.
4. Remove the crank bolt
The crank bolt is located at the end of the crank spindle. Use a wrench to loosen the crank bolt and remove it.
5. Remove the crank spindle
The crank spindle is now free to be removed. To remove it, simply pull it out of the bottom bracket.
Here is a table summarizing the steps for removing a square taper crank:
| Step | Description |
|---|---|
| 1 | Insert the crank puller |
| 2 | Tighten the puller bolt |
| 3 | Remove the crank arm |
| 4 | Remove the crank bolt |
| 5 | Remove the crank spindle |
Removing a Cartridge Crank
To remove a cartridge crank, you will need the following tools:
* 8mm Allen key or socket
* Crank puller
* Mallet
### 1. Remove the crank arm bolts
Use the 8mm Allen key or socket to remove the crank arm bolts. The bolts are usually tightened to a torque of 35-40 Nm, so you may need to use a bit of force to loosen them.
### 2. Thread the crank puller onto the crank arm
Screw the crank puller onto the crank arm. The puller should be tightened until it is snug against the crank arm.
### 3. Tap the crank puller with a mallet
Use a mallet to tap the crank puller. This will force the crank arm off of the spindle.
### 4. Remove the crank arm
Once the crank arm is loose, you can remove it by hand.
### 5. Repeat steps 1-4 for the other crank arm
Remove the other crank arm using the same procedure as above.
### 6. Remove the spindle
Once the crank arms are removed, you can remove the spindle. The spindle is usually held in place by a circlip or a snap ring. Use a pair of circlip pliers to remove the circlip or snap ring.
To remove the spindle, you will need a spindle remover tool. The spindle remover tool is a specialized tool that is designed to remove spindles from cartridge cranks.
Insert the spindle remover tool into the spindle and turn it clockwise. The spindle will come loose and you can then remove it by hand.
| Tool | Description |
|---|---|
| 8mm Allen key or socket | Used to remove the crank arm bolts |
| Crank puller | Used to pull the crank arm off of the spindle |
| Mallet | Used to tap the crank puller |
| Circlip pliers | Used to remove the circlip or snap ring that holds the spindle in place |
| Spindle remover tool | Used to remove the spindle from the crankset |
Reinstalling the Cranks
Once the cranks have been removed, they can be reinstalled by following these steps:
1. Apply a small amount of grease to the splines of the crank axle and the inside of the crank arms.
2. Slide the crank arms onto the axle, making sure that the splines align.
3. Tighten the crank bolts to the specified torque using a torque wrench.
4. Install the chainring bolts and tighten them to the specified torque.
5. Reinstall the pedals.
6. Check the chain tension and adjust it if necessary.
7. Test ride the bicycle to make sure that the cranks are installed correctly and are functioning properly.
Tightening the Crank Bolts
It is important to tighten the crank bolts to the specified torque to ensure that the cranks are securely attached to the axle. The specified torque will vary depending on the type of crankset, but it is typically between 35-50 Nm. If the crank bolts are not tightened to the correct torque, they could come loose and cause the cranks to fall off, which could result in a crash.
| Crankset Type | Torque |
|---|---|
| Square taper | 35-45 Nm |
| Octalink | 40-50 Nm |
| ISIS | 40-50 Nm |
Post-Installation Inspection
Once you’ve removed the cranks, it’s a good idea to inspect them for any damage. Look for any cracks, bends, or other signs of wear and tear. If you find any damage, it’s important to replace the cranks before you ride the bike again.
9. Check the bottom bracket
While you have the cranks removed, it’s a good time to check the bottom bracket. The bottom bracket is the part of the bike that the cranks attach to. Look for any signs of wear or damage, such as cracks, bends, or rust. If you find any damage, you’ll need to replace the bottom bracket before you ride the bike again.
Here are some additional tips for inspecting the bottom bracket:
- Look for any cracks or bends in the bottom bracket shell.
- Check the bearings for any signs of wear or damage.
- Make sure that the bottom bracket is properly tightened.
| Signs of Bottom Bracket Damage |
|---|
| Cracks or bends in the bottom bracket shell |
| Worn or damaged bearings |
| Loose or missing bottom bracket bolts |
Crank Loosening and Tightening Tools
Before attempting to remove your crank, it is important to have the proper tools. A chain whip or crank extractor is necessary to loosen the crank, while a torque wrench is essential for properly tightening it back on. Additionally, a set of allen keys or a crank bolt wrench may be needed to remove the crank arm bolts.
Troubleshooting Common Crank Removal Issues
1. Crank bolts are frozen
If the crank bolts are frozen, it may be necessary to apply a penetrating oil or heat them up with a heat gun to loosen them. Be careful not to overheat the bolts, as this can damage them.
2. Crank is seized onto the spindle
If the crank is seized onto the spindle, it may be necessary to use a crank puller to remove it. A crank puller is a specialized tool that attaches to the crank and uses a threaded bolt to pull the crank off the spindle.
3. Spindle is stripped
If the spindle is stripped, it will need to be replaced. This is a more complex repair that should be performed by a bike mechanic.
4. Crank arm bolts are stripped
If the crank arm bolts are stripped, they will need to be replaced. This is a relatively simple repair that can be done at home.
5. Crank arm is cross-threaded
If the crank arm is cross-threaded, it will need to be removed and re-installed correctly. This is a potentially dangerous repair that should be performed by a bike mechanic.
6. Crank arm is damaged
If the crank arm is damaged, it will need to be replaced. This is a relatively simple repair that can be done at home.
7. Spindle is bent
If the spindle is bent, it will need to be replaced. This is a more complex repair that should be performed by a bike mechanic.
8. Crank bearings are damaged
If the crank bearings are damaged, they will need to be replaced. This is a more complex repair that should be performed by a bike mechanic.
9. Bottom bracket is damaged
If the bottom bracket is damaged, it will need to be replaced. This is a more complex repair that should be performed by a bike mechanic.
10. Crank removal tools are not compatible
Some crank removal tools may not be compatible with all types of cranks. It is important to check the compatibility of the tools with the crank before attempting to use them. If you are unsure which tools are compatible with your crank, consult with a bike mechanic.
How To Remove Bicycle Crank
Removing a bicycle crank is a relatively simple task that can be completed with a few basic tools. The most important thing is to have the right tools for the job and to follow the steps carefully. Here is a step-by-step guide on how to remove a bicycle crank:
- Gather your tools: You will need a 5mm hex wrench, a 10mm wrench, and a crank puller.
- Remove the pedals: Use the 10mm wrench to remove the pedals from the crank arms.
- Locate the crank bolt: The crank bolt is located on the inside of the crank arm, where it attaches to the bottom bracket.
- Loosen the crank bolt: Use the 5mm hex wrench to loosen the crank bolt, but do not remove it completely.
- Attach the crank puller: The crank puller is a tool that helps to remove the crank arm from the bottom bracket. Attach the crank puller to the crank arm, and then tighten the bolts until the puller is snug.
- Remove the crank arm: Use the crank puller to remove the crank arm from the bottom bracket. Be careful not to damage the threads on the crank arm or the bottom bracket.
People Also Ask About How To Remove Bicycle Crank
How do you remove a crank without a crank puller?
There are a few ways to remove a crank without a crank puller. One way is to use a large flat-head screwdriver to pry the crank arm off of the bottom bracket. Another way is to use a hammer and chisel to break the crank arm free. However, these methods are not recommended as they can damage the crank arm or the bottom bracket.
Why is my crank arm stuck?
There are a few reasons why a crank arm might be stuck. One reason is that the crank bolt is too tight. Another reason is that the threads on the crank arm or the bottom bracket are damaged. If the crank arm is stuck, it is best to take it to a bike shop to have it removed.
Can I remove a crankset with a regular wrench?
No, you cannot remove a crankset with a regular wrench. The crankset is held in place by a special crank bolt that requires a 5mm hex wrench to remove.
