Bicycle Lock U-locks and D-locks
Typical u-lock.
A U-lock is a rigid metal ring the same shape as the letter U. The U section of the lock attaches to some crossbar section, and for that reason they are also called D-locks. To lock the bicycle, one locks it physically to some other object, for instance a bike rack securely in the earth, parking meter or even a flagpole. Merely locking the bike frame to the wheel just isn't recommended because, although it cannot be rolled away, the entire
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