Ian David Purdie, who was from the Castle Douglas area, was killed in the accident on the Old Military Road near the town on Wednesday.
He died after his black Triumph motorbike left the road and collided with a wall.
Police have asked anyone who travelled on the road between 16:30 and 23:30 on Wednesday to get in touch.
A 59-year-old man who died in a motorbike crash in south west Scotland has been identified by police.