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In order to have a product liability action, before you can file suit you have to first determine that the bike malfunctioned and was based on defective manufacture or defective design. You state the cause of the accident is unknown, this means you have insufficient evidence to file suit against the manufacturer yet. You must have the bike examined by an expert to determine what caused the accident and if it was some defect in the bike's design or manufacture and only once you have that evidence can you file suit against the manufacturer to hold them strictly liable.
Accidents occur on vehicles all of the time, this does not automatically make the manufacturer liable. In order to hold the manufacturer liable you must have actual evidence that there was something wrong with the bike based on manufacture or design that caused the accident in order to hold them liable. Even if a bike part failed, such as a tire blew out or maybe the steering did not function, you still have to prove it was a defect and not just ordinary wear and tear for the manufacturer to have any liability for the accident.
Thus, to start investigating whether or not there is basis for a suit, you need to get an expert to examine the bike and the accident report to determine the cause of the accident.
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