Freezing bike locks - then smashing. http://www.popsci.com/diy/article/2012-08/gray-matter-how-science-helps-bike-thieves
that is a pretty cheap lock and somehow cooling to -25 degrees Celsius and trying to hammer it while it's on the bike is going to be difficult.
@ammar started
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that is a pretty cheap lock and somehow cooling to -25 degrees Celsius and trying to hammer it while it's on the bike is going to be difficult.