Four rare Orange branded mountain bikes were stolen during a burglary.
The incident took place at around 3.20am on Tuesday, March 14 on Abington Street.
The offenders forced their way into a ground floor cellar and stole the bikes.
One was later recovered on Abington Street, although the three other bikes remain missing.
Anyone with information can contact Northamptonshire Police on 101, or call Crimestoppers anonymously on 0800 555 111.