Replacements will be issued when a product is delivered and there is a malfunction with the operation which is unable to be resolved by way of replacement parts or advice.If you cancel before shipment has left our warehouse, there will be a 3% fee to cover applicable transaction charges. If shipment left warehouse, arrived defective and cannot be fixed by changing a part (frame, motor) we will send a replacement and a shipping slip to return defective item to us for an exchange. There are NO RETURNS for bikes open or used if they can be fixed by changing a part.