In this tutorial, we learn how to make a single speed bike crank. You will need: chain ring bolt tool, large screwdriver, Allen wrench, file, hacksaw, vise, and crank set with 2 ring. First, grab your chain ring bolts and cut about 3mm off of the end. If the nut moves while you are cutting it, adjust it. After this, put your chain ring on the inside of the crank arm to align the chain. When you are finished, you will have a single speed bike crank! This tool shouldn't take too long to create, and will save you money over purchasing new!