The Cube mountain bike was stolen from a bike rack outside Co-op in Seabourne Road at around 8pm on Saturday 10 October 2020.
The victim has since recovered the bike, however, enquiries are ongoing to identify the person responsible for the theft.
Police Community Support Investigator Chris Wilson, of Bournemouth police, said: “We are continuing to investigate this matter and I am issuing a CCTV image of a man we would like to speak to as part of our enquiries.
“I would urge anyone with information as to his identity to please contact us.”
Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email firstname.lastname@example.org or by calling 101, quoting occurrence number 55200152895. Alternatively, to stay 100 per cent anonymous, contact the independent charity Crimestoppers online at Crimestoppers-uk.org or call Freephone 0800 555 111.