All of the bikes were special editions or modified, and worth at least €15,000 each, leading police to believe the thefts were organised. One was a special edition Ducati Panigale bought in the UK and was a one-off in Portugal.
The bikes were stolen from parking spaces outside hotels and rented accommodation in and around Faro.
Footage captured on CCTV showed one of the thefts took place in less than 40 seconds.