From leisurely rides to intense workouts, bicycles have become an integral part of many people’s lives. Maintaining these sturdy machines involves periodic upkeep and repairs, one of which is removing the crank, a crucial component that connects the pedals to the frame. Removing the crank may seem like a daunting task, but it can be accomplished with the right tools and a clear understanding of the process. This guide will provide a step-by-step breakdown of how to remove bicycle pedal crank, ensuring a smooth and successful outcome.
Before embarking on this endeavor, it’s imperative to gather the necessary tools. These include a crank puller, a chain whip, and a set of hex wrenches. A crank puller is a specialized tool designed to extract the crank arms from the bottom bracket, while a chain whip is used to hold the cassette in place during the process. Hex wrenches, also known as Allen keys, come in various sizes and are used to remove the bolts that secure the crank arms and the chainring. Arming yourself with the proper tools will not only make the task less cumbersome but also prevent damage to your bike components.
With the tools at your disposal, you can now proceed with the crank removal process. Begin by shifting the bike into the smallest chainring, which is typically the one closest to the frame. Using a chain whip, secure the cassette by wrapping the chain around the largest cog and hooking the tool onto the spokes. Next, locate the crank bolt, which is situated at the center of the crank arm. Using the appropriate hex wrench, carefully loosen but do not remove the bolt. Repeat this step for the other crank arm. Once the bolts are loose, attach the crank puller to the crank arm and tighten it until it makes contact with the bottom bracket. Slowly turn the crank puller bolt to extract the crank arm from the bottom bracket. Repeat this step for the other crank arm, and your bicycle pedal crank will be successfully removed.
Identifying the Crank Type
Identifying the crank type is crucial before attempting to remove it. Different types require unique tools and techniques, so accurate identification ensures the process is completed efficiently and safely.
3 Common Crank Types:
| Type | Features |
|---|---|
| Square Taper | A square-shaped spindle that fits into a matching hole on the crank arm. |
| Cottered Crank | Held in place by a cotter pin that passes through the crank arm and a slot in the spindle. |
| Octalink/ISIS | An interlocking system featuring splined shafts and locking rings. |
Visual Inspection:
Inspect the cranks for the following features:
- Square hole on the crank arm (Square Taper)
- Cotter pin protruding from the crank arm (Cottered Crank)
- Splines on the spindle and a locking ring on the crank arm (Octalink/ISIS)
Confirming Type:
If unsure about the crank type, consult the bicycle manual or an experienced mechanic. Proper identification is essential to avoid damage during the removal process.
Gathering Essential Tools
Before embarking on the task of removing bicycle pedal cranks, it is crucial to gather the necessary tools to ensure the process goes smoothly and safely. The following tools are essential:
1. Allen Key or Hex Key
An Allen key, also known as a hex key, is typically used to remove the crank arm bolts. The size of the Allen key required will vary depending on the bike model, so it is important to refer to the manufacturer’s specifications.
Types of Allen Keys:
–
| Type | Use |
|---|---|
| Hex Key | Tightening or loosening bolts with hexagonal sockets |
| Torx Key | Tightening or loosening bolts with star-shaped sockets |
2. Pedal Wrench or Socket Wrench
A pedal wrench or socket wrench is specifically designed for removing pedals from the crank arms. These wrenches typically have a wide handle to provide adequate leverage and a specialized opening to accommodate the pedal spindle.
Types of Pedal Wrenches:
–
| Type | Use |
|---|---|
| Adjustable Pedal Wrench | Adjustable to fit different pedal spindle sizes |
| Fixed Pedal Wrench | Specific to a particular pedal spindle size |
| Socket Wrench with Hex Bit | Multi-purpose tool with interchangeable bits, including a hex bit for removing cranks |
3. Chain Whip or Chain Tool
A chain whip or chain tool is used to hold the cogset in place while loosening the lockring that secures the crank to the bottom bracket spindle.
Types of Chain Whips:
–
| Type | Use |
|---|---|
| Chain Whip | Tightens or loosens lockrings by engaging with the chain |
| Chain Tool | Links or breaks chains, and can also be used as a chain whip in some cases |
Removing the Pedals
Before removing the pedals, you should secure your bike to prevent it from falling. To do this, you can use a bike stand or lean the bike against a wall or other stable object.
1. Identifying the Pedal Type
There are two main types of pedals: caged pedals and clipless pedals. Caged pedals have a metal cage that surrounds the foot, while clipless pedals require special cleats that attach to the bottom of the shoe. To identify the type of pedals you have, look at the top of the pedal. If there is a cage, then you have caged pedals. If there is no cage, then you have clipless pedals.
2. Removing Caged Pedals
To remove caged pedals, you will need a 15mm pedal wrench or an adjustable wrench. Place the wrench on the spindle of the pedal, which is the metal shaft that connects the pedal to the crank arm. Turn the wrench counterclockwise to loosen the pedal. Once the pedal is loose, you can remove it by hand.
3. Removing Clipless Pedals
To remove clipless pedals, you will need a 6mm Allen key or a Torx key. Insert the key into the bolt on the side of the pedal and turn it counterclockwise to loosen the bolt. Once the bolt is loose, you can remove the pedal by hand.
| The following table provides a summary of the steps involved in removing bicycle pedals: | |
| Step | Action |
| 1 | Secure your bike to prevent it from falling. |
| 2 | Identify the type of pedals you have (caged or clipless). |
| 3 | For caged pedals, use a 15mm pedal wrench or adjustable wrench to loosen and remove the pedal. |
| 4 | For clipless pedals, use a 6mm Allen key or Torx key to loosen and remove the bolt, then remove the pedal by hand. |
Locating the Crank Bolts
The crank bolts are typically located on the inside of the crank arms, near the bottom bracket. They are usually covered by a plastic or metal cap. To remove the cap, you will need to use a small screwdriver or a pair of pliers. Once the cap is removed, you will see the crank bolts. The crank bolts are usually 8mm or 10mm in size. You will need a socket wrench or a hex key to remove the crank bolts.
Types of Crank Bolts
There are two main types of crank bolts: square taper and splined. Square taper bolts are the most common type. They have a square-shaped head that fits into a corresponding square-shaped hole in the crank arm. Splined bolts have a splined head that fits into a splined hole in the crank arm. Splined bolts are more common on higher-end bikes.
Removing Crank Bolts
To remove a crank bolt, you will need to use a socket wrench or a hex key. If you are using a socket wrench, make sure that the socket is the correct size. If the socket is too small, it will not fit over the bolt head. If the socket is too large, it could damage the bolt head.
Place the socket over the bolt head and turn it counterclockwise to loosen the bolt. Once the bolt is loose, you can remove it by hand.
| Bolt Type | Removal Tool |
|---|---|
| Square Taper | 8mm or 10mm socket wrench or hex key |
| Splined | Specialized splined tool |
Selecting the Appropriate Wrench
To remove bicycle pedal cranks efficiently, selecting the appropriate wrench is crucial. The pedal crank’s size and the bolt or spindle connecting it to the frame determine the wrench you’ll need.
Types of Wrenches Used for Pedal Crank Removal
| Wrench Type | Suitable for Pedal Crank Type |
|---|---|
| Hex Key/Allen Key | Crank bolts with hex sockets |
| Socket Wrench with 8mm or 10mm Socket | Crank bolts with 8mm or 10mm hexagonal heads |
| Crank Puller | Square-taper cranksets (typically on mountain bikes) |
| Pedal Wrench | Removing pedals from the crank arm |
Determining the Correct Wrench Size
Inspect the pedal crank’s bolt or spindle to determine the appropriate wrench size. It is typically marked on the bolt or spindle head. If it’s not marked, use a wrench that fits snugly without any play.
Using the Correct Wrench Technique
Ensure the wrench is securely seated on the bolt or spindle before applying force. Apply downward pressure while turning the wrench counterclockwise to loosen the bolt or spindle.
Breaking Loose the Crank Bolts
Step 6: Use a Torque Wrench
Now that the bolts are loosened, you need to use a torque wrench to remove them completely. A torque wrench is a specialized tool that measures the amount of force applied when tightening or loosening a bolt. This is important because over-tightening the bolts can damage the crank or the frame of the bike.
To use a torque wrench, first set the torque to the recommended level for your bike. This information is usually found in the bike’s manual or on the crank itself. Then, attach the torque wrench to the bolt and slowly turn it until the wrench clicks. This indicates that the bolt has been tightened to the correct torque.
If you don’t have a torque wrench, you can use a regular wrench, but be careful not to over-tighten the bolts. You can also take your bike to a local bike shop and have them remove the crank bolts for you.
Here is a table with the recommended torque settings for crank bolts:
| Crank Type | Torque (Nm) |
| Square Taper | 30-50 |
| Octalink | 45-70 |
| ISIS | 50-75 |
Using a Crank Puller
A crank puller is a specialized tool designed to safely and efficiently remove bicycle pedal cranks. Here’s a step-by-step guide on how to use a crank puller:
1. Gather Your Materials
You will need a crank puller, a hex key, and a wrench or socket.
2. Remove the Pedal
Using a hex key, remove the pedal from the crank arm by turning counterclockwise.
3. Remove the Chain Guard
(Optional)
If your bicycle has a chain guard, remove it to avoid any obstructions.
4. Position the Crank Puller
Screw the crank puller into the crank arm as far as it will go.
5. Tighten the Bolt
Locate the puller bolt on the crank puller and tighten it using a wrench or socket, but be careful not to overtighten.
6. Remove the Crank
As you tighten the puller bolt, it will press against the square taper and separate the crank from the bottom bracket spindle. Continue tightening until the crank comes off.
7. Troubleshooting: Crank Stuck on Spindle
Sometimes, the crank may be stuck on the spindle, making it difficult to remove. Here are a few troubleshooting tips:
| Cause | Solution |
|---|---|
| Rust or Corrosion | Apply a penetrating oil into the gap between the crank and spindle, let it sit for a few hours, and try again. |
| Damaged Spindle | Inspect the spindle for any damage. If damaged, it may need to be replaced. |
| Overtightened Bolt | Loosen the puller bolt, tap the crank from the bottom using a rubber mallet, and then try again. |
Removing the Crank Arm
Once the crank arm bolt has been loosened, you can remove the crank arm. To do this, simply pull the crank arm straight off the spindle. You may need to use a bit of force, but be careful not to damage the crank arm or the spindle.
Here are some additional tips for removing the crank arm:
- If the crank arm is particularly stuck, you can try using a penetrating oil to loosen it up.
- You can also try using a rubber mallet to gently tap the crank arm loose.
- Be careful not to overtighten the crank arm bolt when you reassemble the crankset.
Using a Crank Arm Puller
If you are unable to remove the crank arm by hand, you can use a crank arm puller. This is a specialized tool that is designed to remove crank arms.
To use a crank arm puller, first remove the crank arm bolt. Then, attach the crank arm puller to the crank arm. Tighten the puller’s bolt until the crank arm pops off.
Here are some additional tips for using a crank arm puller:
- Make sure that the crank arm puller is the correct size for your crank arm.
- Be careful not to overtighten the puller’s bolt.
- If the crank arm is particularly stuck, you can try using a penetrating oil to loosen it up.
| Tool | Use |
|---|---|
| Crank arm bolt wrench | To loosen or tighten the crank arm bolt |
| Crank arm puller | To remove the crank arm |
| Rubber mallet | To gently tap the crank arm loose |
Inspecting and Lubricating the Threads
Before installing the crankset, it’s crucial to ensure that the threads on the bottom bracket spindle and crank arms are clean, undamaged, and properly lubricated. Neglecting this step can lead to difficulties in assembling the crankset or premature wear and damage to the components.
Inspection
Thoroughly inspect the threads for any debris, dirt, or damage. Use a clean cloth to wipe away any visible dirt or grease. If there are any burrs or imperfections on the threads, carefully file or smooth them out using a fine-grit file or sandpaper.
Lubrication
Once the threads are clean, apply a thin layer of thread locker or anti-seize compound to the threads of the bottom bracket spindle and crank arms. This lubricant will prevent the components from seizing or corroding over time and make future disassembly easier.
Specific Lubricant Recommendations
For optimal results, use a high-quality thread locker or anti-seize compound specifically designed for bicycle components. Some reputable brands include:
| Lubricant Type | Recommended Brands |
|---|---|
| Thread Locker | Loctite, Permatex, Blue Loctite |
| Anti-Seize Compound | Park Tool® Anti-Seize Compound, Finish Line® Fiber Grip, Tri-Flow® Superior Lubricant |
Follow the manufacturer’s instructions carefully when applying the lubricant to ensure proper adhesion and longevity.
Reinstalling the Crank Arm
Once the crank arm has been removed, it is time to reinstall it. To do this, follow these steps:
- Apply a small amount of grease to the threads of the crank arm and the spindle.
- Thread the crank arm onto the spindle by hand as far as you can.
- Use a crank arm wrench to tighten the crank arm as much as you can.
- Check the tightness of the crank arm by trying to move it back and forth. There should be no play in the crank arm.
- Repeat steps 1-4 for the other crank arm.
- Tighten the crank arm bolts to the specified torque using a torque wrench.
- Install the pedals.
- Test the bike by riding it for a short distance.
- Check the tightness of the crank arms and pedals after riding the bike for a short distance.
- Make any necessary adjustments.
- A 5mm Allen key
- A 15mm socket wrench
- A chain whip
- A crank puller
To ensure the crank arm is properly installed, refer to the manufacturer’s torque specifications. Here’s a general guide for common crank arm torque values.
| Crank Arm Type | Torque (Nm) |
|---|---|
| Square Taper | 35-50 |
| Cottered | 60-90 |
| ISIS Drive | 40-55 |
| Octalink | 40-55 |
| Hollowtech II | 50-70 |
How To Remove Bicycle Pedal Crank
Removing your bicycle’s pedal crank is a relatively simple task that can be completed with a few basic tools. Before you begin, make sure that you have the correct tools for the job and that you are comfortable working on your bicycle. It is important to note that the process of removing a pedal crank can vary depending on the type of crank you have. If you have any questions or concerns, it is always best to consult with a professional bicycle mechanic.
To remove a pedal crank, you will need the following tools:
Once you have gathered your tools, you can begin the process of removing the pedal crank. First, use the 5mm Allen key to remove the bolt that attaches the crank arm to the pedal. Once the bolt has been removed, you can use the 15mm socket wrench to loosen the nut that attaches the crank arm to the bottom bracket. Once the nut has been loosened, you can use the chain whip to remove the crank arm from the bottom bracket. Finally, you can use the crank puller to remove the crank arm from the pedal crank.
