My freind recently bought a single chainring for his bike to convert from 3 to 1 at the front. We could get the chainrings loose but couldn't get the crank arm off, even after we un-did the allen key bolt thing. The crankset is Truvativ Hussefelt and the single chainring is Truvativ DH single ring.
We really need to know how to get the crank arm off. Is it with a special tool, is there something else holding it on, do you need a crank puller?