cranks on department store bikes?
My friend recently bought me a cheap 70's department store bike (10-speed) but it's not in my possession yet. I'm hoping to convert it to a fixed gear. I was wondering if anyone knows what type of crank these bikes typically have. But my real question is: will I be able to remove extra chainrings and just use the largest one? (I'm trying to avoid buying a new crank)
Thanks!