What is a crank puller?
A crank puller is a tool used to remove the crank arms from a bicycle’s bottom bracket spindle. The crank arms are the components that connect the pedals to the bottom bracket, allowing the rider to pedal the bike. Over time, the crank arms may become loose or need to be replaced, and a crank puller is essential for safely and effectively removing them without damaging the bike.
How does a crank puller work?
A crank puller typically consists of two main parts: a threaded rod with a handle on one end and a specialized attachment on the other end. The attachment is designed to fit securely onto the crank arm, while the threaded rod is used to apply pressure and pull the crank arm away from the bottom bracket spindle.
To use a crank puller, the attachment is screwed into the crank arm until it is securely in place. The handle is then turned clockwise, which causes the threaded rod to push against the bottom bracket spindle, pulling the crank arm away from the bike. This process is repeated for each crank arm until they are both removed.
When should you use a crank puller?
A crank puller should be used whenever you need to remove the crank arms from a bicycle. This may be necessary for maintenance or repairs, such as replacing worn-out crank arms or bottom bracket components. Using a crank puller ensures that the crank arms are removed safely and without causing damage to the bike’s frame or other components.
What are the different types of crank pullers?
There are several different types of crank pullers available, each designed for specific types of crank arms and bottom bracket spindles. Some common types include:
1. Square Taper Crank Puller: This type of crank puller is designed for square taper crank arms, which are commonly found on older bikes. The attachment has a square hole that fits over the square taper spindle, allowing for easy removal.
2. Hollowtech II Crank Puller: This type of crank puller is designed for Hollowtech II crank arms, which are commonly found on modern road and mountain bikes. The attachment is shaped to fit securely over the splined spindle, ensuring a tight grip for removal.
3. Octalink Crank Puller: This type of crank puller is designed for Octalink crank arms, which have eight splines on the spindle. The attachment is shaped to fit over the splined spindle, allowing for easy removal without damaging the crank arm.
How to use a crank puller?
To use a crank puller, follow these steps:
1. Select the appropriate crank puller for your bike’s crank arms and bottom bracket spindle.
2. Screw the attachment into the crank arm until it is securely in place.
3. Position the crank puller over the bottom bracket spindle and tighten the handle clockwise to apply pressure.
4. Continue turning the handle until the crank arm is pulled away from the spindle.
5. Repeat the process for the other crank arm if necessary.
What are some tips for using a crank puller effectively?
To use a crank puller effectively, consider the following tips:
1. Ensure that the crank puller is securely attached to the crank arm before applying pressure.
2. Use a lubricant on the threads of the crank puller to make it easier to turn the handle.
3. Apply even pressure when turning the handle to avoid damaging the crank arm or bottom bracket spindle.
4. If the crank arm is difficult to remove, tap it gently with a rubber mallet to help loosen it.
5. Always follow the manufacturer’s instructions for using the crank puller to ensure safe and effective removal of the crank arms.