A 16-year-old boy was pushed over on a path in Northampton before robbers rode off on the boy's bike.
Witnesses are being sought following the robbery on Saturday, March 11.
Sometime between 8.30pm and 9pm, the 16-year-old boy was cycling through the Kingsthorpe entrance of Bradlaugh Fields. When he was on the path where it splits into two, between the green gates and the cut-through to Moulton, he was pushed from his bike by two teenagers who then took it.
The first offender is described as white, in his late teens, around 6ft, with wide shoulders but a skinny build and wearing black tracksuit bottoms, a blue-zipped hooded top and black gloves.
The second offender is described as black, between 16 and 19 years old, with a stockier build, wearing a black hooded top and black tracksuit bottoms.
Witnesses can contact police on 101, or Crimestoppers anonymously on 0800 111 555.