My only bike that was stolen WAS LOCKED! In the bike rack at my high school - which (unfortunately) was right outside the 'Shop class' windows and in the faculty parking lot... Go figure... 1974 Fuji 'Special Tourer' F9B18529. Stolen Sept 1974. Do i ever trust a lock? No. It might discourage the casual ride-away, but against a determined- or prepared thief? No lock is safe!!!