Four push bike thefts in as many weeks have seen the police issuing a warning to cyclists in Falmouth, Penryn and Helston.
Sergeant Martin Roberts said “preventative measures” were key on cutting down on this kind of opportunistic crime.
“In the last four weeks we have had four go when they have been secured in different locations in Falmouth,” he said.
“If you are going to leave any bike, make sure it’s secured but also make sure it’s locked to something that does not move.”
Some recent thefts had simply involved people “lifting up the bike and walking off with it” because the owner had only locked the bike to itself, Sgt Roberts added.
A distinctive mountain bike with white handlebars and a “snowy camouflage” saddle was stolen on January 28. Anyone with any information can contact the police on 101.