I have seen this image before and wondered what it was. Good to know.
I suggested that it was an early American mountain bike that you rode, under power, to the top of a hill, and then allowed gravity to power down the hill at great (breakneck) speed!
Motorcycle Timeline 
I have seen this image before and wondered what it was. Good to know.
I suggested that it was an early American mountain bike that you rode, under power, to the top of a hill, and then allowed gravity to power down the hill at great (breakneck) speed!
Reg
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That sounds like a great new sport!
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