There is no such thing as a lock that will hold a bike if someone really wants it. It is the easiest thing in the world to steal a bike in broad daylight anywhere, anytime.
Don't believe me?
http://www.youtube.com/watch?v=J7zb8YXrmIA
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1