A bike was stolen outside McDonald's in Borehamwood earlier this month.
The green and blue Carrera Valour was taken between 3.45pm and 3.50pm on Sunday July 7.
Police have released a CCTV image of someone they would like to speak to in connection with their investigation into the stolen bike.
PCSO Barry Lovegrove from the Borehamwood safer neighbourhood team said: “A young lad has had his bicycle stolen which was worth hundreds of pounds.
"If you recognise the man in the photo, please get in touch as he may have information that may help with our investigation."
Anyone with information is asked to contact PCSO Lovegrove via email at barry.lovegrove@herts.pnn.police.uk, or call 101, quoting crime reference 41/61424/19.
Or you can contact Crimestoppers anonymously on 0800555111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here