A 27-year-old man was hit over the head after being forced to hand over cash to two men in Downs Barn Boulevard last week.
The victim sustained swelling to his left eye and a bloodied nose and was treated at Milton Keynes Hospital after the attack at around 9.45pm on Wednesday.
The offenders made off on the victim’s bike with his money after hitting him over the head, which knocked him to the floor.
The first offender is black, between 24 and 27-years-old, of average build and 5ft 8ins tall. He was wearing a black hooded top, black padded body warmer, black jogging bottoms and black trainers.
The only description of the second offender is that he was a black man wearing dark coloured clothing.
The victim’s stolen bike is a black and orange Saracen mountain bike with a black frame and orange front suspension forks. The bike has a skull and crossbones logo on it.
Police are appealing for witnesses who may have seen the offenders in the area or anyone acting suspiciously.
Anyone with information should contact Det Con Susan Russell of Milton Keynes local area CID via the Thames Valley Police Enquiry Centre on 101.
If you don’t want to speak directly to the police, you can contact the independent charity Crimestoppers (opens new window) anonymously on 0800 555 111.
No personal details are taken, information is not traced or recorded and you will not go to court.