>>28574507
[continued]
So if we now look in China for our cheap 30 lbs crank, then I found prices for grey cast or ductile cast of about $0.55 per pound for castings of this size - pic rel.
So our cheap 30 lb crank in cast iron would cost around $16.50 - and that's before any machining. Plus in reality you'd probably want a better grade of material

So I personally doubt the $1 crankshaft from China story