That will be great! You are in Tenn, correct? If so, you should contact the Tenn historical society after you found it. 
Please do not mis-understood me. I never question the age of the bike, but how the bike got that high off the ground. When reading that poster, it just says that the boy chained it to the tree and left there. Nothing about having it hung up there.
My argument was that, despite the bike was chain to the tree, the tree will never grow up wards taking the bike with it. In fact that part of the tree does not even move up at all just grows outward. One reason you see rings in a cross section of the tree.
I agree in that is is unlikely when you take into account all the trees in the woods, but there are many forces and random factors at work that could result in this happening. Nature is cool. (like bike-eating tree cool)
