Palmerston North Rescue Helicopter said one of the Good Samaritan tourists told them they were an astronaut.
Pilot Chris Moody said they had a friend in common who was also an astronaut in the German space team.
The German tourists were travelling across the scenic central island route heading to Hastings when they came across the dazed rider, he said.
The man had come off his bike on a bend around 30km east of Moawhango and was found near his crashed bike.
He had no recollection of what happened or how long he had been there, said Mr Moody.