Tips for repairing a bike. Learn how to remove the crank on a bike with expert tips on bicycle repair in this free video clip.
Hello, this is Russ from the Salt Lake City Bicycle Collective. Online at slcbikecollective.org. Also here on behalf of Expert Village. Today I'm going to be showing you how to remove your crank, maybe for cleaning or other adjustments, maybe new chain rings. And go ahead and reinstall it as well. First thing you're going to need to do to remove it, sometimes there's plastic caps over the top of these. You're going to want to remove those caps. In this situation, we don't have any caps on there. Fourteen millimeter wrench. It?s a pretty thin wrench, a lot of times you can get away with a socket as well. They're both normal size threads. You want to make sure when you're removing this that you have yourself in a pretty safe position. If you slip, these chain rings have a tendency to hurt you pretty bad, so you want to be in a pretty safe position. Crack that nut loose, go ahead and remove it. This tool is not a bike specific tool, but the next one is. This one here is called a crank arm extractor. And what it does is it fits in the interface of the crank arm here. Threads into there. And after you have that threaded in there, you're going want to go ahead and turn the other lever all the way around. So, what's going to happen is this threads into the crank arm there by affixing the tool into it and then as you have this piece here, this piece pushes on to the end of the spindle, thereby drawing the arm off of the spindle. The spindle is a tapered square spindle and what that means is it gets tapered as it goes up and that's what creates tension onto the inside of the crank arm and provides load and keeps it into place.