A bicycle lock
is a physical security
device used on a bicycle to prevent theft
. It is generally used to fasten the bicycle to a bicycle stand
or other immovable object.
An important difficulty in preventing the theft of a bicycle is that the wheels
are easily detachable from the frame
, and that unless both wheels and frame are secured, wheels can easily be carried away after being detached. The most secure locking method therefore is to lock the wheels and frame to each other and to an immovable object.
Locking devices vary in size and security; the most secure tending to be the largest, heaviest and least portable. Lesser equipment is used to deter attempts by less skilled and determined thieves. Thus like other security equipment, bicycle locks must compromise between security, portability and cost. Some are made of particularly expensive materials chosen for their acceptable strength and low density.
An alternate defense is the provision of bicycle lockers
in which the whole bicycle is locked. This also safeguards equipment such as lamps, tools, spare tubes etc, against all but the most industrious thief, or one equipped with heavy equipment or power tools. Bicycle lockers, however, generally take up much more space than exposed bicycle racks, limiting potential storage capacity in a given space. An alternative is a card-access bike cage such as is present at Alewife station
. In addition to a bike lock, bike registry
can further assist in... Read More