Bicycles with a total value of more than £25,000 have been stolen in Guernsey since the start of the year.
In the last week alone, five bikes have been taken in the island. In one theft, a bike worth about £2,000 went missing from Vale Road.
Guernsey's Crime Prevention Officer, Bernie English, is urging people to report their stolen cycles as missing.
He said: "Many are taken by people just to get home, and they might end up in a police station cycle store."
He added: "Often bikes are recovered and the owners never found. The numbers can be just staggering."