The Carrera Zelos road bike, fitted with white pedals, was stolen from a business in Kingsthorpe Hollow between 8.30am and 3pm on Thursday, October 21.
The bike was left secured to a cycle rack at a premises on Bembridge Drive.
On Thursday, November 3 it is believed the same bike was seen being ridden by a man in the Kingsthorpe area at about 1.30pm.
The bike has been pictured with black pedals, which had been changed to white petals shortly before the theft.
Officers would like to speak to the man pictured and anyone who recognises him or has any information about the stolen bike, is asked to contact Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.