A young holidaymaker was left ‘upset’ after he was forced to hand over his bike to a man in Worthing, according to Sussex Police.
The force is investigating after man threatened a 14-year-old boy in Montague Street, just after 8pm on 27 August.
The bike is described as black, with stickers on the frame and blue spokes.
Sussex Police says it wants to talk to a man described as white, 5’ 8”, of medium build and with black greying hair.
If you have seen the bike, call 101 quoting 1169 of 27/08 or call Crimestoppers anonymously on 0800 555 111.