The Shimano Octalink is a type of spline arrangement found on Shimano cranks. The eight splines (hence, "Octalink") are teeth on the hole of the crank arm where it attaches to the spindle that holds the crank arm onto the bike. A crank bolt places tension on the splines and spindle and holds them together. It is not a common repair to replace the crank arm, but if you want to upgrade your crank set, you will need to know how to remove the crank arms.
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Things you need
- Hex wrench
- Crank bolt puller
Use the hex wrench to remove the crank bolt. Turn the hex wrench counterclockwise until the crank bolt comes out. Remove the washer that is inside.
Determine if your crank arm is self-extracting. If the crank arm comes off easily after the bolt if removed, it is self-extracting. Many Octalink systems on newer bikes will have this type of crank arm. If the crank arm is still fastened tight, proceed to Step 3.
Turn the nut on the crank puller until it is even with the tip of the tool. Insert the end of the crank puller into the crank arm hole and turn until it is tight. Once it is tight, turn the bolt clockwise using the handle of the crank puller until the crank arm comes off.
Repeat Steps 1-3 on the other side of the bike.
Tips and warnings
- When using the crank puller, be certain it is threaded as far into the hole as possible--otherwise you risk damaging the threads on the spindle.
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