At approximately 5.20am on Thursday 27 April 2017, a bike was left locked to a bike rack outside the Stirling train station on Cedric Street Stirling.
At approximately 5.10pm, two men walked up to the where the bike was and used an unknown implement to break the bike lock and rode away with the bike and the bike lock.
The bike is described as a black and silver Malvern Star mountain bike.
Police have released CCTV images of two men who they believe can assist them with their investigation.
Both are described as dark skinned, between 25-35 years of age and medium build.
If you have any information about this offence make a report online at crimestopperswa.com.au or call Crime Stoppers on 1800 333 000, where all calls are strictly confidential, and rewards are offered. Please quote Reference Number 8512.