Derbyshire Police have released a CCTV footage of a group of men entering a store in Long Eaton in the middle of a day and stealing two motorbikes.
It happened at a Leisure Trail store in Beech Avenue, Long Eaton in the early afternoon of Friday 13 April.
The footage also shows the men browsing the shop just a few minutes prior to the theft.
One of the bikes has since been found, but the second one - a blue Husqvarna - is still lost.
Officers want to speak to all four men in connection with the incident.
Anyone with information is asked to come forward by calling 101 or reach out to Crimestoppers anonymously at 0800 555 111.